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Publisher: Elsevier   (Total: 3043 journals)

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Showing 1 - 200 of 3043 Journals sorted alphabetically
AASRI Procedia     Open Access   (Followers: 15)
Academic Pediatrics     Hybrid Journal   (Followers: 20, SJR: 1.402, h-index: 51)
Academic Radiology     Hybrid Journal   (Followers: 18, SJR: 1.008, h-index: 75)
Accident Analysis & Prevention     Partially Free   (Followers: 83, SJR: 1.109, h-index: 94)
Accounting Forum     Hybrid Journal   (Followers: 23, SJR: 0.612, h-index: 27)
Accounting, Organizations and Society     Hybrid Journal   (Followers: 27, SJR: 2.515, h-index: 90)
Achievements in the Life Sciences     Open Access   (Followers: 4)
Acta Anaesthesiologica Taiwanica     Open Access   (Followers: 5, SJR: 0.338, h-index: 19)
Acta Astronautica     Hybrid Journal   (Followers: 333, SJR: 0.726, h-index: 43)
Acta Automatica Sinica     Full-text available via subscription   (Followers: 3)
Acta Biomaterialia     Hybrid Journal   (Followers: 25, SJR: 2.02, h-index: 104)
Acta Colombiana de Cuidado Intensivo     Full-text available via subscription   (Followers: 1)
Acta de Investigación Psicológica     Open Access   (Followers: 2)
Acta Ecologica Sinica     Open Access   (Followers: 8, SJR: 0.172, h-index: 29)
Acta Haematologica Polonica     Free   (SJR: 0.123, h-index: 8)
Acta Histochemica     Hybrid Journal   (Followers: 3, SJR: 0.604, h-index: 38)
Acta Materialia     Hybrid Journal   (Followers: 225, SJR: 3.683, h-index: 202)
Acta Mathematica Scientia     Full-text available via subscription   (Followers: 5, SJR: 0.615, h-index: 21)
Acta Mechanica Solida Sinica     Full-text available via subscription   (Followers: 9, SJR: 0.442, h-index: 21)
Acta Oecologica     Hybrid Journal   (Followers: 9, SJR: 0.915, h-index: 53)
Acta Otorrinolaringologica (English Edition)     Full-text available via subscription   (Followers: 1)
Acta Otorrinolaringológica Española     Full-text available via subscription   (Followers: 3, SJR: 0.311, h-index: 16)
Acta Pharmaceutica Sinica B     Open Access   (Followers: 2)
Acta Poética     Open Access   (Followers: 4)
Acta Psychologica     Hybrid Journal   (Followers: 23, SJR: 1.365, h-index: 73)
Acta Sociológica     Open Access  
Acta Tropica     Hybrid Journal   (Followers: 6, SJR: 1.059, h-index: 77)
Acta Urológica Portuguesa     Open Access  
Actas Dermo-Sifiliograficas     Full-text available via subscription   (Followers: 4)
Actas Dermo-Sifiliográficas (English Edition)     Full-text available via subscription   (Followers: 3)
Actas Urológicas Españolas     Full-text available via subscription   (Followers: 4, SJR: 0.383, h-index: 19)
Actas Urológicas Españolas (English Edition)     Full-text available via subscription   (Followers: 2)
Actualites Pharmaceutiques     Full-text available via subscription   (Followers: 5, SJR: 0.141, h-index: 3)
Actualites Pharmaceutiques Hospitalieres     Full-text available via subscription   (Followers: 4, SJR: 0.112, h-index: 2)
Acupuncture and Related Therapies     Hybrid Journal   (Followers: 3)
Ad Hoc Networks     Hybrid Journal   (Followers: 11, SJR: 0.967, h-index: 57)
Addictive Behaviors     Hybrid Journal   (Followers: 15, SJR: 1.514, h-index: 92)
Addictive Behaviors Reports     Open Access   (Followers: 5)
Additive Manufacturing     Hybrid Journal   (Followers: 8, SJR: 1.039, h-index: 5)
Additives for Polymers     Full-text available via subscription   (Followers: 20)
Advanced Drug Delivery Reviews     Hybrid Journal   (Followers: 134, SJR: 5.2, h-index: 222)
Advanced Engineering Informatics     Hybrid Journal   (Followers: 11, SJR: 1.265, h-index: 53)
Advanced Powder Technology     Hybrid Journal   (Followers: 16, SJR: 0.739, h-index: 33)
Advances in Accounting     Hybrid Journal   (Followers: 9, SJR: 0.299, h-index: 15)
Advances in Agronomy     Full-text available via subscription   (Followers: 15, SJR: 2.071, h-index: 82)
Advances in Anesthesia     Full-text available via subscription   (Followers: 25, SJR: 0.169, h-index: 4)
Advances in Antiviral Drug Design     Full-text available via subscription   (Followers: 3)
Advances in Applied Mathematics     Full-text available via subscription   (Followers: 6, SJR: 1.054, h-index: 35)
Advances in Applied Mechanics     Full-text available via subscription   (Followers: 10, SJR: 0.801, h-index: 26)
Advances in Applied Microbiology     Full-text available via subscription   (Followers: 22, SJR: 1.286, h-index: 49)
Advances In Atomic, Molecular, and Optical Physics     Full-text available via subscription   (Followers: 16, SJR: 3.31, h-index: 42)
Advances in Biological Regulation     Hybrid Journal   (Followers: 4, SJR: 2.277, h-index: 43)
Advances in Botanical Research     Full-text available via subscription   (Followers: 3, SJR: 0.619, h-index: 48)
Advances in Cancer Research     Full-text available via subscription   (Followers: 25, SJR: 2.215, h-index: 78)
Advances in Carbohydrate Chemistry and Biochemistry     Full-text available via subscription   (Followers: 9, SJR: 0.9, h-index: 30)
Advances in Catalysis     Full-text available via subscription   (Followers: 5, SJR: 2.139, h-index: 42)
Advances in Cellular and Molecular Biology of Membranes and Organelles     Full-text available via subscription   (Followers: 12)
Advances in Chemical Engineering     Full-text available via subscription   (Followers: 24, SJR: 0.183, h-index: 23)
Advances in Child Development and Behavior     Full-text available via subscription   (Followers: 10, SJR: 0.665, h-index: 29)
Advances in Chronic Kidney Disease     Full-text available via subscription   (Followers: 10, SJR: 1.268, h-index: 45)
Advances in Clinical Chemistry     Full-text available via subscription   (Followers: 28, SJR: 0.938, h-index: 33)
Advances in Colloid and Interface Science     Full-text available via subscription   (Followers: 18, SJR: 2.314, h-index: 130)
Advances in Computers     Full-text available via subscription   (Followers: 16, SJR: 0.223, h-index: 22)
Advances in Developmental Biology     Full-text available via subscription   (Followers: 11)
Advances in Digestive Medicine     Open Access   (Followers: 4)
Advances in DNA Sequence-Specific Agents     Full-text available via subscription   (Followers: 5)
Advances in Drug Research     Full-text available via subscription   (Followers: 22)
Advances in Ecological Research     Full-text available via subscription   (Followers: 42, SJR: 3.25, h-index: 43)
Advances in Engineering Software     Hybrid Journal   (Followers: 25, SJR: 0.486, h-index: 10)
Advances in Experimental Biology     Full-text available via subscription   (Followers: 7)
Advances in Experimental Social Psychology     Full-text available via subscription   (Followers: 40, SJR: 5.465, h-index: 64)
Advances in Exploration Geophysics     Full-text available via subscription   (Followers: 3)
Advances in Fluorine Science     Full-text available via subscription   (Followers: 8)
Advances in Food and Nutrition Research     Full-text available via subscription   (Followers: 47, SJR: 0.674, h-index: 38)
Advances in Fuel Cells     Full-text available via subscription   (Followers: 15)
Advances in Genetics     Full-text available via subscription   (Followers: 15, SJR: 2.558, h-index: 54)
Advances in Genome Biology     Full-text available via subscription   (Followers: 11)
Advances in Geophysics     Full-text available via subscription   (Followers: 6, SJR: 2.325, h-index: 20)
Advances in Heat Transfer     Full-text available via subscription   (Followers: 21, SJR: 0.906, h-index: 24)
Advances in Heterocyclic Chemistry     Full-text available via subscription   (Followers: 8, SJR: 0.497, h-index: 31)
Advances in Human Factors/Ergonomics     Full-text available via subscription   (Followers: 26)
Advances in Imaging and Electron Physics     Full-text available via subscription   (Followers: 2, SJR: 0.396, h-index: 27)
Advances in Immunology     Full-text available via subscription   (Followers: 35, SJR: 4.152, h-index: 85)
Advances in Inorganic Chemistry     Full-text available via subscription   (Followers: 9, SJR: 1.132, h-index: 42)
Advances in Insect Physiology     Full-text available via subscription   (Followers: 3, SJR: 1.274, h-index: 27)
Advances in Integrative Medicine     Hybrid Journal   (Followers: 5)
Advances in Intl. Accounting     Full-text available via subscription   (Followers: 4)
Advances in Life Course Research     Hybrid Journal   (Followers: 8, SJR: 0.764, h-index: 15)
Advances in Lipobiology     Full-text available via subscription   (Followers: 2)
Advances in Magnetic and Optical Resonance     Full-text available via subscription   (Followers: 9)
Advances in Marine Biology     Full-text available via subscription   (Followers: 16, SJR: 1.645, h-index: 45)
Advances in Mathematics     Full-text available via subscription   (Followers: 10, SJR: 3.261, h-index: 65)
Advances in Medical Sciences     Hybrid Journal   (Followers: 6, SJR: 0.489, h-index: 25)
Advances in Medicinal Chemistry     Full-text available via subscription   (Followers: 5)
Advances in Microbial Physiology     Full-text available via subscription   (Followers: 4, SJR: 1.44, h-index: 51)
Advances in Molecular and Cell Biology     Full-text available via subscription   (Followers: 22)
Advances in Molecular and Cellular Endocrinology     Full-text available via subscription   (Followers: 10)
Advances in Molecular Toxicology     Full-text available via subscription   (Followers: 7, SJR: 0.324, h-index: 8)
Advances in Nanoporous Materials     Full-text available via subscription   (Followers: 4)
Advances in Oncobiology     Full-text available via subscription   (Followers: 3)
Advances in Organometallic Chemistry     Full-text available via subscription   (Followers: 15, SJR: 2.885, h-index: 45)
Advances in Parallel Computing     Full-text available via subscription   (Followers: 7, SJR: 0.148, h-index: 11)
Advances in Parasitology     Full-text available via subscription   (Followers: 7, SJR: 2.37, h-index: 73)
Advances in Pediatrics     Full-text available via subscription   (Followers: 24, SJR: 0.4, h-index: 28)
Advances in Pharmaceutical Sciences     Full-text available via subscription   (Followers: 13)
Advances in Pharmacology     Full-text available via subscription   (Followers: 15, SJR: 1.718, h-index: 58)
Advances in Physical Organic Chemistry     Full-text available via subscription   (Followers: 7, SJR: 0.384, h-index: 26)
Advances in Phytomedicine     Full-text available via subscription  
Advances in Planar Lipid Bilayers and Liposomes     Full-text available via subscription   (Followers: 3, SJR: 0.248, h-index: 11)
Advances in Plant Biochemistry and Molecular Biology     Full-text available via subscription   (Followers: 8)
Advances in Plant Pathology     Full-text available via subscription   (Followers: 5)
Advances in Porous Media     Full-text available via subscription   (Followers: 4)
Advances in Protein Chemistry     Full-text available via subscription   (Followers: 18)
Advances in Protein Chemistry and Structural Biology     Full-text available via subscription   (Followers: 19, SJR: 1.5, h-index: 62)
Advances in Psychology     Full-text available via subscription   (Followers: 60)
Advances in Quantum Chemistry     Full-text available via subscription   (Followers: 5, SJR: 0.478, h-index: 32)
Advances in Radiation Oncology     Open Access  
Advances in Small Animal Medicine and Surgery     Hybrid Journal   (Followers: 2, SJR: 0.1, h-index: 2)
Advances in Space Research     Full-text available via subscription   (Followers: 345, SJR: 0.606, h-index: 65)
Advances in Structural Biology     Full-text available via subscription   (Followers: 8)
Advances in Surgery     Full-text available via subscription   (Followers: 7, SJR: 0.823, h-index: 27)
Advances in the Study of Behavior     Full-text available via subscription   (Followers: 30, SJR: 1.321, h-index: 56)
Advances in Veterinary Medicine     Full-text available via subscription   (Followers: 16)
Advances in Veterinary Science and Comparative Medicine     Full-text available via subscription   (Followers: 13)
Advances in Virus Research     Full-text available via subscription   (Followers: 5, SJR: 1.878, h-index: 68)
Advances in Water Resources     Hybrid Journal   (Followers: 43, SJR: 2.408, h-index: 94)
Aeolian Research     Hybrid Journal   (Followers: 5, SJR: 0.973, h-index: 22)
Aerospace Science and Technology     Hybrid Journal   (Followers: 310, SJR: 0.816, h-index: 49)
AEU - Intl. J. of Electronics and Communications     Hybrid Journal   (Followers: 8, SJR: 0.318, h-index: 36)
African J. of Emergency Medicine     Open Access   (Followers: 5, SJR: 0.344, h-index: 6)
Ageing Research Reviews     Hybrid Journal   (Followers: 8, SJR: 3.289, h-index: 78)
Aggression and Violent Behavior     Hybrid Journal   (Followers: 408, SJR: 1.385, h-index: 72)
Agri Gene     Hybrid Journal  
Agricultural and Forest Meteorology     Hybrid Journal   (Followers: 15, SJR: 2.18, h-index: 116)
Agricultural Systems     Hybrid Journal   (Followers: 30, SJR: 1.275, h-index: 74)
Agricultural Water Management     Hybrid Journal   (Followers: 38, SJR: 1.546, h-index: 79)
Agriculture and Agricultural Science Procedia     Open Access  
Agriculture and Natural Resources     Open Access   (Followers: 1)
Agriculture, Ecosystems & Environment     Hybrid Journal   (Followers: 53, SJR: 1.879, h-index: 120)
Ain Shams Engineering J.     Open Access   (Followers: 5, SJR: 0.434, h-index: 14)
Air Medical J.     Hybrid Journal   (Followers: 5, SJR: 0.234, h-index: 18)
AKCE Intl. J. of Graphs and Combinatorics     Open Access   (SJR: 0.285, h-index: 3)
Alcohol     Hybrid Journal   (Followers: 9, SJR: 0.922, h-index: 66)
Alcoholism and Drug Addiction     Open Access   (Followers: 6)
Alergologia Polska : Polish J. of Allergology     Full-text available via subscription   (Followers: 1)
Alexandria Engineering J.     Open Access   (Followers: 1, SJR: 0.436, h-index: 12)
Alexandria J. of Medicine     Open Access  
Algal Research     Partially Free   (Followers: 8, SJR: 2.05, h-index: 20)
Alkaloids: Chemical and Biological Perspectives     Full-text available via subscription   (Followers: 3)
Allergologia et Immunopathologia     Full-text available via subscription   (Followers: 1, SJR: 0.46, h-index: 29)
Allergology Intl.     Open Access   (Followers: 4, SJR: 0.776, h-index: 35)
ALTER - European J. of Disability Research / Revue Européenne de Recherche sur le Handicap     Full-text available via subscription   (Followers: 7, SJR: 0.158, h-index: 9)
Alzheimer's & Dementia     Hybrid Journal   (Followers: 48, SJR: 4.289, h-index: 64)
Alzheimer's & Dementia: Diagnosis, Assessment & Disease Monitoring     Open Access   (Followers: 5)
Alzheimer's & Dementia: Translational Research & Clinical Interventions     Open Access   (Followers: 3)
American Heart J.     Hybrid Journal   (Followers: 48, SJR: 3.157, h-index: 153)
American J. of Cardiology     Hybrid Journal   (Followers: 45, SJR: 2.063, h-index: 186)
American J. of Emergency Medicine     Hybrid Journal   (Followers: 38, SJR: 0.574, h-index: 65)
American J. of Geriatric Pharmacotherapy     Full-text available via subscription   (Followers: 6, SJR: 1.091, h-index: 45)
American J. of Geriatric Psychiatry     Hybrid Journal   (Followers: 16, SJR: 1.653, h-index: 93)
American J. of Human Genetics     Hybrid Journal   (Followers: 31, SJR: 8.769, h-index: 256)
American J. of Infection Control     Hybrid Journal   (Followers: 24, SJR: 1.259, h-index: 81)
American J. of Kidney Diseases     Hybrid Journal   (Followers: 33, SJR: 2.313, h-index: 172)
American J. of Medicine     Hybrid Journal   (Followers: 46, SJR: 2.023, h-index: 189)
American J. of Medicine Supplements     Full-text available via subscription   (Followers: 3)
American J. of Obstetrics and Gynecology     Hybrid Journal   (Followers: 187, SJR: 2.255, h-index: 171)
American J. of Ophthalmology     Hybrid Journal   (Followers: 54, SJR: 2.803, h-index: 148)
American J. of Ophthalmology Case Reports     Open Access   (Followers: 3)
American J. of Orthodontics and Dentofacial Orthopedics     Full-text available via subscription   (Followers: 6, SJR: 1.249, h-index: 88)
American J. of Otolaryngology     Hybrid Journal   (Followers: 23, SJR: 0.59, h-index: 45)
American J. of Pathology     Hybrid Journal   (Followers: 26, SJR: 2.653, h-index: 228)
American J. of Preventive Medicine     Hybrid Journal   (Followers: 21, SJR: 2.764, h-index: 154)
American J. of Surgery     Hybrid Journal   (Followers: 34, SJR: 1.286, h-index: 125)
American J. of the Medical Sciences     Hybrid Journal   (Followers: 12, SJR: 0.653, h-index: 70)
Ampersand : An Intl. J. of General and Applied Linguistics     Open Access   (Followers: 5)
Anaerobe     Hybrid Journal   (Followers: 4, SJR: 1.066, h-index: 51)
Anaesthesia & Intensive Care Medicine     Full-text available via subscription   (Followers: 55, SJR: 0.124, h-index: 9)
Anaesthesia Critical Care & Pain Medicine     Full-text available via subscription   (Followers: 9)
Anales de Cirugia Vascular     Full-text available via subscription  
Anales de Pediatría     Full-text available via subscription   (Followers: 2, SJR: 0.209, h-index: 27)
Anales de Pediatría (English Edition)     Full-text available via subscription  
Anales de Pediatría Continuada     Full-text available via subscription   (SJR: 0.104, h-index: 3)
Analytic Methods in Accident Research     Hybrid Journal   (Followers: 2, SJR: 2.577, h-index: 7)
Analytica Chimica Acta     Hybrid Journal   (Followers: 38, SJR: 1.548, h-index: 152)
Analytical Biochemistry     Hybrid Journal   (Followers: 164, SJR: 0.725, h-index: 154)
Analytical Chemistry Research     Open Access   (Followers: 8, SJR: 0.18, h-index: 2)
Analytical Spectroscopy Library     Full-text available via subscription   (Followers: 11)
Anesthésie & Réanimation     Full-text available via subscription   (Followers: 1)
Anesthesiology Clinics     Full-text available via subscription   (Followers: 22, SJR: 0.421, h-index: 40)
Angiología     Full-text available via subscription   (SJR: 0.124, h-index: 9)
Angiologia e Cirurgia Vascular     Open Access  
Animal Behaviour     Hybrid Journal   (Followers: 158, SJR: 1.907, h-index: 126)
Animal Feed Science and Technology     Hybrid Journal   (Followers: 5, SJR: 1.151, h-index: 83)
Animal Reproduction Science     Hybrid Journal   (Followers: 5, SJR: 0.711, h-index: 78)
Annales d'Endocrinologie     Full-text available via subscription   (Followers: 1, SJR: 0.394, h-index: 30)
Annales d'Urologie     Full-text available via subscription  
Annales de Cardiologie et d'Angéiologie     Full-text available via subscription   (SJR: 0.177, h-index: 13)
Annales de Chirurgie de la Main et du Membre Supérieur     Full-text available via subscription  
Annales de Chirurgie Plastique Esthétique     Full-text available via subscription   (Followers: 2, SJR: 0.354, h-index: 22)
Annales de Chirurgie Vasculaire     Full-text available via subscription   (Followers: 1)

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Journal Cover Advances in Colloid and Interface Science
  [SJR: 2.314]   [H-I: 130]   [18 followers]  Follow
    
   Full-text available via subscription Subscription journal
   ISSN (Print) 0001-8686
   Published by Elsevier Homepage  [3043 journals]
  • Recent experimental advances for understanding bubble-particle attachment
           in flotation
    • Authors: Yaowen Xing; Xiahui Gui; Lei Pan; Bat-El Pinchasik; Yijun Cao; Jiongtian Liu; Michael Kappl; Hans-Jürgen Butt
      Pages: 105 - 132
      Abstract: Publication date: August 2017
      Source:Advances in Colloid and Interface Science, Volume 246
      Author(s): Yaowen Xing, Xiahui Gui, Lei Pan, Bat-El Pinchasik, Yijun Cao, Jiongtian Liu, Michael Kappl, Hans-Jürgen Butt
      Bubble-particle interaction is of great theoretical and practical importance in flotation. Significant progress has been achieved over the past years and the process of bubble-particle collision is reasonably well understood. This, however, is not the case for bubble-particle attachment leading to three-phase contact line formation due to the difficulty in both theoretical analysis and experimental verification. For attachment, surface forces play a major role. They control the thinning and rupture of the liquid film between the bubble and the particle. The coupling between force, bubble deformation and film drainage is critical to understand the underlying mechanism responsible for bubble-particle attachment. In this review we first discuss the advances in macroscopic experimental methods for characterizing bubble-particle attachment such as induction timer and high speed visualization. Then we focus on advances in measuring the force and drainage of thin liquid films between an air bubble and a solid surface at a nanometer scale. Advances, limits, challenges, and future research opportunities are discussed. By combining atomic force microscopy and reflection interference contrast microscopy, the force, bubble deformation, and liquid film drainage can be measured simultaneously. The simultaneous measurement of the interaction force and the spatiotemporal evolution of the confined liquid film hold great promise to shed new light on flotation.
      Graphical abstract image

      PubDate: 2017-08-02T11:43:44Z
      DOI: 10.1016/j.cis.2017.05.019
      Issue No: Vol. 246 (2017)
       
  • A review on the mechanical and thermodynamic robustness of
           superhydrophobic surfaces
    • Authors: Liam R.J. Scarratt; Ullrich Steiner; Chiara Neto
      Pages: 133 - 152
      Abstract: Publication date: August 2017
      Source:Advances in Colloid and Interface Science, Volume 246
      Author(s): Liam R.J. Scarratt, Ullrich Steiner, Chiara Neto
      Advancements in the fabrication and study of superhydrophobic surfaces have been significant over the past 10years, and some 20years after the discovery of the lotus effect, the study of special wettability surfaces can be considered mainstream. While the fabrication of superhydrophobic surfaces is well advanced and the physical properties of superhydrophobic surfaces well-understood, the robustness of these surfaces, both in terms of mechanical and thermodynamic properties, are only recently getting attention in the literature. In this review we cover publications that appeared over the past ten years on the thermodynamic and mechanical robustness of superhydrophobic surfaces, by which we mean the long term stability under conditions of wear, shear and pressure. The review is divided into two parts, the first dedicated to thermodynamic robustness and the second dedicated to mechanical robustness of these complex surfaces. Our work is intended as an introductory review for researchers interested in addressing longevity and stability of superhydrophobic surfaces, and provides an outlook on outstanding aspects of investigation.
      Graphical abstract image

      PubDate: 2017-08-02T11:43:44Z
      DOI: 10.1016/j.cis.2017.05.018
      Issue No: Vol. 246 (2017)
       
  • Monitoring the different micelle species and the slow kinetics of
           tetraethylammonium perfluorooctane-sulfonate by 19F NMR spectroscopy
    • Authors: Xiaolin Wang; Jingfei Chen; Dong Wang; Shuli Dong; Jingcheng Hao; Heinz Hoffmann
      Pages: 153 - 164
      Abstract: Publication date: August 2017
      Source:Advances in Colloid and Interface Science, Volume 246
      Author(s): Xiaolin Wang, Jingfei Chen, Dong Wang, Shuli Dong, Jingcheng Hao, Heinz Hoffmann
      Since we lack effective tools that can monitor the structures of surfactant micelles in situ, the different equilibrium species and the slow kinetics of micelles are still not well understood. Herein, by using 19F NMR, we simultaneously monitored that micelles of tetraethylammonium perfluorooctanesulfonate (TPFOS, C8F17SO3N(C2H5)4) in water grow more complex in virtue of hydrophobic counterions and the slow kinetic exchange process exists in the system. Apart from the monomeric signals, three sets of micelle signals which correspond to spherical micelles, wormlike/wormlike micelles with rings in end caps and toroidal micelles were successfully detected on the NMR time scale because of the slow exchange rate for surfactant molecules between the monomer and the micelle states. By comparison, other fluoro- and hydrocarbon surfactants with different tail lengths and counterions (+ N(CH3)4, + N(C3H7)4, Li+ and Na+) have been studied, and the coexistence of different micelles could also been observed for the aqueous solution of C9F19COON(CH3)4. However, only one set of averaged NMR signals could be observed for these surfactants. The micellization of TPFOS in water is demonstrated to be a predominantly entropy-driven process. Molecular dynamics (MD) simulation revealed an unusual distribution of counterions, providing further understanding of the mechanism of the micelle formation process.
      Graphical abstract image

      PubDate: 2017-08-02T11:43:44Z
      DOI: 10.1016/j.cis.2017.05.016
      Issue No: Vol. 246 (2017)
       
  • Physicochemical and colloidal aspects of food matrix effects on
           gastrointestinal fate of ingested inorganic nanoparticles
    • Authors: David Julian McClements; Hang Xiao; Philip Demokritou
      Pages: 165 - 180
      Abstract: Publication date: August 2017
      Source:Advances in Colloid and Interface Science, Volume 246
      Author(s): David Julian McClements, Hang Xiao, Philip Demokritou
      Inorganic nanoparticles, such as titanium dioxide, silicon dioxide, iron oxide, zinc oxide, or silver nanoparticles, are added to some food products and food packaging materials to obtain specific functional attributes, such as lightening, powder flow, nutrition, or antimicrobial properties. These engineered nanomaterials (ENMs) all have dimensions below 100nm, but may still vary considerably in composition, morphology, charge, surface properties and aggregation state, which effects their gastrointestinal fate and potential toxicity. In addition to their intrinsic physicochemical and morphological properties, the extrinsic properties of the media they are suspended in also affects their biotransformation, gastrointestinal fate and bioactivity. For instance, inorganic nanoparticles are usually consumed as part of a food or meal that contains numerous other components, such as lipids, proteins, carbohydrates, surfactants, minerals, and water, which may alter their gastrointestinal fate. This review article provides an overview of the potential effects of food components on the behavior of ENMs in the gastrointestinal tract (GIT), and highlights some important physicochemical and colloidal mechanisms by which the food matrix may alter the properties of inorganic nanoparticles. This information is essential for developing appropriate test methods to establish the potential toxicity and biokinetics of inorganic nanoparticles in foods.
      Graphical abstract image

      PubDate: 2017-08-02T11:43:44Z
      DOI: 10.1016/j.cis.2017.05.010
      Issue No: Vol. 246 (2017)
       
  • Molecular design of flotation collectors: A recent progress
    • Authors: Guangyi Liu; Xianglin Yang; Hong Zhong
      Pages: 181 - 195
      Abstract: Publication date: August 2017
      Source:Advances in Colloid and Interface Science, Volume 246
      Author(s): Guangyi Liu, Xianglin Yang, Hong Zhong
      The nature of froth flotation is to selectively hydrophobize valuable minerals by collector adsorption so that the hydrophobized mineral particles can attach air bubbles. In recent years, the increasing commercial production of refractory complex ores has been urgent to develop special collectors for enhancing flotation separation efficiency of valuable minerals from these ores. Molecular design methods offer an effective way for understanding the structure-property relationship of flotation collectors and developing new ones. The conditional stability constant (CSC), molecular mechanics (MM), quantitative structure-activity relationship (QSAR), and first-principle theory, especially density functional theory (DFT), have been adopted to build the criteria for designing flotation collectors. Azole-thiones, guanidines, acyl thioureas and thionocarbamates, amide-hydroxamates, and double minerophilic-group surfactants such as Gemini, dithiourea and dithionocarbamate molecules have been recently developed as high-performance collectors. To design hydrophobic groups, the hydrophilic-hydrophobic balance parameters have been extensively used as criteria. The replacement of aryl group with aliphatic group or CC single bond(s) with CC double bond(s), reduction of carbon numbers, introduction of oxygen atom(s) and addition of trisiloxane to the tail terminal have been proved to be useful approaches for adjusting the surface activity of collectors. The role of molecular design of collectors in practical flotation applications was also summarized. Based on the critical review, some comments and prospects for further research on molecular design of flotation collectors were also presented in the paper.
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      PubDate: 2017-08-02T11:43:44Z
      DOI: 10.1016/j.cis.2017.05.008
      Issue No: Vol. 246 (2017)
       
  • Porous structure of ion exchange membranes investigated by various
           techniques
    • Authors: N. Kononenko; V. Nikonenko; D. Grande; C. Larchet; L. Dammak; M. Fomenko; Yu. Volfkovich
      Pages: 196 - 216
      Abstract: Publication date: August 2017
      Source:Advances in Colloid and Interface Science, Volume 246
      Author(s): N. Kononenko, V. Nikonenko, D. Grande, C. Larchet, L. Dammak, M. Fomenko, Yu. Volfkovich
      A comparative review of various techniques is provided: mercury intrusion porosimetry, nitrogen sorption porosimetry, differential scanning calorimetry (DSC)-based thermoporosimetry, and standard contact porosimetry (SCP), which allows determining pore volume distribution versus pore radius/water binding energy in ion-exchange membranes (IEMs). IEMs in the swollen state have a labile structure involving micro-, meso- and macropores, whose size is a function of the external water vapor pressure. For such materials, the most appropriate methods for quantifying their porosity are DSC and SCP. Especially significant information is given by the SCP method allowing measuring porosimetric curves in a very large pore size range from 1 to 105 nm. Experimental results of water distribution in homogeneous and heterogeneous commercial and modified IEMs are presented. The effect of various factors on water distribution is reviewed, i.e. nature of polymeric matrix and functional groups, method for membrane preparation, membrane ageing. A special attention is given to the effect of membrane modification by embedding nanoparticles in their structure. The porosimetric curves are considered along with the results of electrochemical characterization involving the measurements of membrane conductivity, as well as diffusion and electroosmotic permeability. It is shown that addition of nanoparticles may lead to either increase or decrease of water content in IEMs, different ranges of pore size being affected. Hybrid membranes modified with hydrated zirconium dioxide exhibit much higher permselectivity in comparison with the pristine membranes. The diversity of the responses of membrane properties to their modification allows for formation of membranes suitable for fuel cells, electrodialysis or other applications.

      PubDate: 2017-08-02T11:43:44Z
      DOI: 10.1016/j.cis.2017.05.007
      Issue No: Vol. 246 (2017)
       
  • Approaches to self-assembly of colloidal monolayers: A guide for
           nanotechnologists
    • Authors: Valeria Lotito; Tomaso Zambelli
      Pages: 217 - 274
      Abstract: Publication date: August 2017
      Source:Advances in Colloid and Interface Science, Volume 246
      Author(s): Valeria Lotito, Tomaso Zambelli
      Self-assembly of quasi-spherical colloidal particles in two-dimensional (2D) arrangements is essential for a wide range of applications from optoelectronics to surface engineering, from chemical and biological sensing to light harvesting and environmental remediation. Several self-assembly approaches have flourished throughout the years, with specific features in terms of complexity of the implementation, sensitivity to process parameters, characteristics of the final colloidal assembly. Selecting the proper method for a given application amidst the vast literature in this field can be a challenging task. In this review, we present an extensive classification and comparison of the different techniques adopted for 2D self-assembly in order to provide useful guidelines for scientists approaching this field. After an overview of the main applications of 2D colloidal assemblies, we describe the main mechanisms underlying their formation and introduce the mathematical tools commonly used to analyse their final morphology. Subsequently, we examine in detail each class of self-assembly techniques, with an explanation of the physical processes intervening in crystallization and a thorough investigation of the technical peculiarities of the different practical implementations. We point out the specific characteristics of the set-ups and apparatuses developed for self-assembly in terms of complexity, requirements, reproducibility, robustness, sensitivity to process parameters and morphology of the final colloidal pattern. Such an analysis will help the reader to individuate more easily the approach more suitable for a given application and will draw the attention towards the importance of the details of each implementation for the final results.
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      PubDate: 2017-08-02T11:43:44Z
      DOI: 10.1016/j.cis.2017.04.003
      Issue No: Vol. 246 (2017)
       
  • Application of mass transfer theory to biomarker capture by surface
           functionalized magnetic beads in microcentrifuge tubes
    • Authors: Thomas F. Scherr; Christine F. Markwalter; Westley S. Bauer; David Gasperino; David W. Wright; Frederick R. Haselton
      Pages: 275 - 288
      Abstract: Publication date: August 2017
      Source:Advances in Colloid and Interface Science, Volume 246
      Author(s): Thomas F. Scherr, Christine F. Markwalter, Westley S. Bauer, David Gasperino, David W. Wright, Frederick R. Haselton
      In many diagnostic assays, specific biomarker extraction and purification from a patient sample is performed in microcentrifuge tubes using surface-functionalized magnetic beads. Although assay binding times are known to be highly dependent on sample viscosity, sample volume, capture reagent, and fluid mixing, the theoretical mass transport framework that has been developed and validated in engineering has yet to be applied in this context. In this work, we adapt this existing framework for simultaneous mass transfer and surface reaction and apply it to the binding of biomarkers in clinical samples to surface-functionalized magnetic beads. We discuss the fundamental fluid dynamics of vortex mixing within microcentrifuge tubes as well as describe how particles and biomolecules interact with the fluid. The model is solved over a wide range of parameters, and we present scenarios when a simplified analytical expression would be most accurate. Next, we review of some relevant techniques for model parameter estimation. Finally, we apply the mass transfer theory to practical use-case scenarios of immediate use to clinicians and assay developers. Throughout, we highlight where further characterization is necessary to bridge the gap between theory and practical application.

      PubDate: 2017-08-02T11:43:44Z
      DOI: 10.1016/j.cis.2017.02.006
      Issue No: Vol. 246 (2017)
       
  • Stable oil-laden foams: Formation and evolution
    • Authors: Rémy Mensire; Elise Lorenceau
      Abstract: Publication date: Available online 2 August 2017
      Source:Advances in Colloid and Interface Science
      Author(s): Rémy Mensire, Elise Lorenceau
      The interaction between oil and foam has been the subject of various studies. Indeed, oil can be an efficient defoaming agent, which can be highly valuable in various industrial applications where undesired foaming may occur, as seen in jet-dyeing processes or waste water treatment plant. However, oil and foam can also constructively interact as observed in detergency, fire-fighting, food and petroleum industries, where oil can be in the foam structure or put into contact with the foam without observing a catastrophic break-up of the foam. Under specific physico-chemistry conditions, the oil phase can even be trapped inside the aqueous network of the foam, thus providing interesting complex materials made of three different fluid phases that we name oil-laden foam (OLF). In this review, we focus on such systems, with a special emphasis on dry OLF, i.e. with a total liquid volume fraction, ε smaller than 5%. We first try to clarify the physical and chemical conditions for these systems to appear, we review the different techniques of the literature to obtain them. Then we discuss their structure and identify two different OLF morphologies, named foamed emulsion, in which small oil globules are comprised within the network of the aqueous foam and biliquid foams, where the oil also comprised in the aqueous foam network is continuous at the scale of several bubbles. Last, we review the state of the art of their evolution in particular concerning topological changes, coalescence, coarsening and drainage.
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      PubDate: 2017-08-02T11:43:44Z
      DOI: 10.1016/j.cis.2017.07.027
       
  • ifc (ed board)
    • Abstract: Publication date: August 2017
      Source:Advances in Colloid and Interface Science, Volume 246


      PubDate: 2017-08-02T11:43:44Z
       
  • Advances in the synthesis, molecular architectures and potential
           applications of gemini surfactants
    • Authors: Renu Sharma; Ajar Kamal; Maryam Abdinejad; Rakesh Kumar Mahajan; Heinz-Bernhard Kraatz
      Abstract: Publication date: Available online 29 July 2017
      Source:Advances in Colloid and Interface Science
      Author(s): Renu Sharma, Ajar Kamal, Maryam Abdinejad, Rakesh Kumar Mahajan, Heinz-Bernhard Kraatz
      Gemini surfactants have been the subject of intensive scrutiny by virtue of their unique combination of physical and chemical properties and being used in ordinary household objects to multifarious industrial processes. In this review, we summarize the recent developments of gemini surfactants, highlighting the classification of gemini surfactants based on the variation in headgroup polarity, flexibility/rigidity of spacer, hydrophobic alkyl chain and counterion along with potential applications of gemini surfactants, depicting the truly remarkable journey of gemini surfactants that has just come of age. We have focused on those objectives which will act as suitable candidates to take the field forward. The preceding information will permit us to estimate the effect of structural variation on the aggregation behavior of gemini surfactants for nanoscience and biological applications like antimicrobial, anti-fungal agent, better gene and drug delivery agent with low cytotoxicity and biodegradability, which makes them more advantageous for a number of technological processes and hence reduces the impact of these gemini surfactants on the environment.
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      PubDate: 2017-08-02T11:43:44Z
      DOI: 10.1016/j.cis.2017.07.032
       
  • Effect of contact angle and contact angle hysteresis on the floatability
           of spheres at the air-water interface
    • Authors: Dong-xia Feng; Anh V. Nguyen
      Abstract: Publication date: Available online 28 July 2017
      Source:Advances in Colloid and Interface Science
      Author(s): Dong-xia Feng, Anh V. Nguyen, Xiong Tong
      The floatability of solid particles on the water surface governs many natural phenomena and industrial processes including film flotation and froth flotation separation of coal and valuable minerals. For many years, the contact angle (CA) has been postulated as the key factor in determining the particle floatability. Indeed, the maximum force (tenacity) supporting the flotation of fine spheres was conjectured to occur when the apical angle of the contact circle is equal to the contact angle. In this paper, the model predictions are reviewed and compared with experimental results. It is shown that CA can be affected by many physical and chemical factors such as surface roughness and chemical heterogeneity and can have a range of values known as the CA hysteresis. This multiple-valued CA invalidates the available theories on the floatability of spheres. Even the intuitive replacement of CA by the advancing (maximum) CA in the classical theories can be wrong. A few new examples are also reviewed and analyzed to demonstrate the significance of CA variation in controlling the particle floatability. They include the pinning of the contact line at the sharp edge, known as the Gibbs inequality condition, and the nearby interaction among floating particles, known as lateral inter-particle interaction. It is concluded that our quantitative understanding of the floatability of real particles being irregular and heterogeneous both morphologically and chemically is still far from being satisfactory.
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      PubDate: 2017-08-02T11:43:44Z
      DOI: 10.1016/j.cis.2017.07.031
       
  • Membrane interactions and antimicrobial effects of inorganic nanoparticles
    • Authors: Sara Malekkhaiat-Häffner; Martin Malmsten
      Abstract: Publication date: Available online 27 July 2017
      Source:Advances in Colloid and Interface Science
      Author(s): Sara Malekkhaiat-Häffner, Martin Malmsten
      Interactions between nanoparticles and biological membranes are attracting increasing attention in current nanomedicine, and play a key role both for nanotoxicology and for utilizing nanomaterials in diagnostics, drug delivery, functional biomaterials, as well as combinations of these, e.g., in theranostics. In addition, there is considerable current interest in the use of nanomaterials as antimicrobial agents, motivated by increasing resistance development against conventional antibiotics. Here, various nanomaterials offer opportunities for triggered functionalites to combat challenging infections. Although the performance in these diverse applications is governed by a complex interplay between the nanomaterial, the properties of included drugs (if any), and the biological system, nanoparticle-membrane interactions constitute a key initial step and play a key role for the subsequent biological response. In the present overview, the current understanding of inorganic nanomaterials as antimicrobial agents is outlined, with special focus on the interplay between antimicrobial effects and membrane interactions, and how membrane interactions and antimicrobial effects of such materials depend on nanoparticle properties, membrane composition, and external (e.g., light and magnetic) fields.
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      PubDate: 2017-08-02T11:43:44Z
      DOI: 10.1016/j.cis.2017.07.029
       
  • Natural and bioinspired nanostructured bactericidal surfaces
    • Authors: Abinash Tripathy; Prosenjit Sen; Bo Su; Wuge H. Briscoe
      Abstract: Publication date: Available online 27 July 2017
      Source:Advances in Colloid and Interface Science
      Author(s): Abinash Tripathy, Prosenjit Sen, Bo Su, Wuge H. Briscoe
      Bacterial antibiotic resistance is becoming more widespread due to excessive use of antibiotics in healthcare and agriculture. At the same time the development of new antibiotics has effectively ground to a hold. Chemical modifications of material surfaces have poor long-term performance in preventing bacterial build-up and hence approaches for realising bactericidal action through physical surface topography have become increasingly important in recent years. The complex nature of the bacteria cell wall interactions with nanostructured surfaces represents many challenges while the design of nanostructured bactericidal surfaces is considered. Here we present a brief overview of the bactericidal behaviour of naturally occurring and bio-inspired nanostructured surfaces against different bacteria through the physico-mechanical rupture of the cell wall. Many parameters affect this process including the size, shape, density, rigidity/flexibility and surface chemistry of the surface nanotextures as well as factors such as bacteria specificity (e.g. gram positive and gram negative) and motility. Different fabrication methods for such bactericidal nanostructured surfaces are summarised.
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      PubDate: 2017-08-02T11:43:44Z
      DOI: 10.1016/j.cis.2017.07.030
       
  • Interfacial tension of reactive, liquid interfaces and its consequences
    • Authors: Anaïs Giustiniani; Wiebke Drenckhan; Christophe Poulard
      Abstract: Publication date: Available online 24 July 2017
      Source:Advances in Colloid and Interface Science
      Author(s): Anaïs Giustiniani, Wiebke Drenckhan, Christophe Poulard
      Dispersions of immiscible liquids, such as emulsions and polymer blends, are at the core of many industrial applications which makes the understanding of their properties (morphology, stability, etc.) of great interest. A wide range of these properties depend on interfacial phenomena, whose understanding is therefore of particular importance. The behaviour of interfacial tension in emulsions and polymer blends is well-understood - both theoretically and experimentally - in the case of non-reactive stabilization processes using pre-made surfactants. However, this description of the interfacial tension behaviour in reactive systems, where the stabilizing agents are created in-situ (and which is more efficient as a stabilization route for many systems), does not yet find a consensus among the community. In this review, we compare the different theories which have been developed for non-reactive and for reactive systems, and we discuss their ability to capture the behaviour found experimentally. Finally, we address the consequences of the reactive stabilization process both on the global emulsions or polymer blend morphologies and at the interfacial scale.
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      PubDate: 2017-08-02T11:43:44Z
      DOI: 10.1016/j.cis.2017.07.017
       
  • Viscous dynamics of drops and bubbles in Hele-Shaw cells: drainage, drag
           friction, coalescence, and bursting
    • Authors: Okumura
      Abstract: Publication date: Available online 22 July 2017
      Source:Advances in Colloid and Interface Science
      Author(s): Ko Okumura
      In this review article, we discuss recent studies on drops and bubbles in Hele-Shaw cells, focusing on how scaling laws exhibit crossovers from the three-dimensional counterparts and focusing on topics in which viscosity plays an important role. By virtue of progresses in analytical theory and high-speed imaging, dynamics of drops and bubbles have actively been studied with the aid of scaling arguments. However, compared with three dimensional problems, studies on the corresponding problems in Hele-Shaw cells are still limited. This review demonstrates that the effect of confinement in the Hele-Shaw cell introduces new physics allowing different scaling regimes to appear. For this purpose, we discuss various examples that are potentially important for industrial applications handling drops and bubbles in confined spaces by showing agreement between experiments and scaling theories. As a result, this review provides a collection of problems in hydrodynamics that may be analytically solved or that may be worth studying numerically in the near future.
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      PubDate: 2017-07-23T04:22:51Z
       
  • Probing foam with neutrons
    • Authors: Alesya Mikhailovskaya; Li Zhang; Fabrice Cousin; François Boué; Pavel Yazhgur; François Muller; Cyprien Gay; Anniina Salonen
      Abstract: Publication date: Available online 22 July 2017
      Source:Advances in Colloid and Interface Science
      Author(s): Alesya Mikhailovskaya, Li Zhang, Fabrice Cousin, François Boué, Pavel Yazhgur, François Muller, Cyprien Gay, Anniina Salonen
      Foams are multiscale materials that have an enormous number of uses. As the relevant structural length-scales span from a few nanometres up to millimetres a number of characterisation methods need to be combined to obtain the full material structure. In this review we explain how foams can be explored using Small Angle Neutron Scattering (SANS). We remind the reader of the basics of SANS and contrast variation before we describe the different types of experiments that have been carried out on foams emphasising the specific role of neutrons in learning about the systems. To date SANS has been used to measure different foam structural parameters, such as the film thickness and the bubble size. Several studies have also been carried out to elucidate the organisation of the stabilising objects in the bulk solution. Finally we show how SANS measurements can be used to measure foam composition. Some of the accessible information is unique to SANS experiments, but as the method is still not very widely used on foams the review is also aimed to act as an introduction on how to carry out such measurements on foams.
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      PubDate: 2017-07-23T04:22:51Z
      DOI: 10.1016/j.cis.2017.07.024
       
  • Applicability of the Gibbs Adsorption Isotherm to the analysis of
           experimental surface-tension data for ionic and nonionic surfactants
    • Authors: L. Martínez-Balbuena; Araceli Arteaga-Jiménez; Ernesto Hernández-Zapata; César Márquez-Beltrán
      Abstract: Publication date: Available online 21 July 2017
      Source:Advances in Colloid and Interface Science
      Author(s): L. Martínez-Balbuena, Araceli Arteaga-Jiménez, Ernesto Hernández-Zapata, César Márquez-Beltrán
      The Gibbs Adsorption Isotherm equation is a two-dimensional analogous of the Gibbs-Duhem equation, and it is one of the cornerstones of interface science. It is also widely used to estimate the surface excess concentration (SEC) for surfactants and other compounds in aqueous solution, from surface tension measurements. However, in recent publications some authors have cast doubt on this method. In the present work, we review some of the best available surface tension experimental data, and compare estimations of the SEC, using the Gibbs isotherm method (GIM), to direct measurements reported in the literature. This is done for both nonionic and ionic surfactants, with and without added salt. Our review leads to the conclusion that the GIM has a very solid agreement with experiments, and that it does estimate accurately the SEC for surfactant concentrations smaller than the critical micellar concentration (CMC).
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      PubDate: 2017-07-23T04:22:51Z
      DOI: 10.1016/j.cis.2017.07.018
       
  • Recent advances in studying single bacteria and biofilm mechanics
    • Authors: Catherine Even; Christian Marlière; Jean-Marc Ghigo; Jean-Marc Allain; Alba Marcellan; Eric Raspaud
      Abstract: Publication date: Available online 21 July 2017
      Source:Advances in Colloid and Interface Science
      Author(s): Catherine Even, Christian Marlière, Jean-Marc Ghigo, Jean-Marc Allain, Alba Marcellan, Eric Raspaud
      Bacterial biofilms correspond to surface-associated bacterial communities embedded in hydrogel-like matrix, in which high cell density, reduced diffusion and physico-chemical heterogeneity play a protective role and induce novel behaviors. In this review, we present recent advances on the understanding of how bacterial mechanical properties, from single cell to high-cell density community, determine biofilm tri-dimensional growth and eventual dispersion and we attempt to draw a parallel between these properties and the mechanical properties of other well-studied hydrogels and living systems.
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      PubDate: 2017-07-23T04:22:51Z
      DOI: 10.1016/j.cis.2017.07.026
       
  • Surface tension- and buoyancy-driven flows across horizontally propagating
           chemical fronts
    • Authors: R. Tiani; A. De Wit; L. Rongy
      Abstract: Publication date: Available online 20 July 2017
      Source:Advances in Colloid and Interface Science
      Author(s): R. Tiani, A. De Wit, L. Rongy
      Chemical reactions can interplay with hydrodynamic flows to generate various complex phenomena. Because of their relevance in many research areas, chemically-induced hydrodynamic flows have attracted increasing attention in the last decades. In this context, we propose to give a review of the past and recent theoretical and experimental works which have considered the interaction of such flows with chemical fronts, i.e. reactive interfaces, formed between miscible solutions. We focus in particular on the influence of surface tension- (Marangoni) and buoyancy-driven flows on the dynamics of chemical fronts propagating horizontally in the gravity field.
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      PubDate: 2017-07-23T04:22:51Z
      DOI: 10.1016/j.cis.2017.07.020
       
  • Thermo- and soluto-capillarity: Passive and active drops
    • Authors: Yuri S. Ryazantsev; Manuel G. Velarde; Ramón G. Rubio; Eduardo Guzmán; Francisco Ortega; Pilar López
      Abstract: Publication date: Available online 20 July 2017
      Source:Advances in Colloid and Interface Science
      Author(s): Yuri S. Ryazantsev, Manuel G. Velarde, Ramón G. Rubio, Eduardo Guzmán, Francisco Ortega, Pilar López
      A survey is provided of a variety of problems where a passive or an active drop experiences directed motion consequence of the action of an external or internal agent or a combination of both. An active drop is capable of reacting by engendering autonomous, self-propelled motion in favor or against the agent. The phenomena involved offer diverse complexity but one way or another the drop motion finally rests on thermo- or soluto-capillarity hence on interfacial tension gradients. Accordingly, here a minimal mathematical framework underlying such drop motions is provided when direct external temperature or solute gradients, illumination, internal heat generation or surface chemical reaction are incorporated into the physico-chemical-hydrodynamics.
      Graphical abstract image

      PubDate: 2017-07-23T04:22:51Z
      DOI: 10.1016/j.cis.2017.07.025
       
  • Phase-separated surfactant monolayers: Exploiting immiscibility of
           fluorocarbons and hydrocarbons to pattern interfaces
    • Authors: Matthew F. Paige; Ala'a F. Eftaiha
      Abstract: Publication date: Available online 20 July 2017
      Source:Advances in Colloid and Interface Science
      Author(s): Matthew F. Paige, Ala'a F. Eftaiha
      The mutual immiscibility of hydrogenated and fluorinated surfactants at interfaces frequently leads to phase-separation, which provides a useful and flexible method for patterning air-water and solid-air interfaces. In this article, we review recent advances in the use of hydrogenated-fluorinated surfactant mixtures to achieve interfacial patterning. For even relatively simple systems comprised of binary mixed monolayers of hydrogenated and perfluorinated fatty acids, a diverse range of film morphologies can be generated at the air-water interface and successfully transferred onto solid substrates. Systematic investigations reported over the past several years have allowed for correlation between the chemical structure of the film constituents with the gross film morphology and underlying crystalline structure of the films. Early thermodynamic models based on the interplay between dipole-dipole repulsion forces between charged headgroups balanced by line tension between phases that were formulated to describe phase-behavior in simple phospholipid monolayer systems, have proven highly useful to describe morphologies for the immiscible surfactant blends. Beyond simple binary fatty acid mixtures, highly-structured films have also been reported in mixed phospholipid systems, which have found important application in controlling the physical, compositional and performance properties of lung surfactant mixtures, as well as in semifluorinated alkane monolayers which form unique, hemimicellar structures at both liquid and solid interfaces. We also describe advances in using these approaches to pattern photopolymerizable, luminescent surfactants, which have found extensive use in colorimetric and fluorometric sensing devices. The long-term outlook for this field, with an emphasis on potential applications and future research directions are discussed.
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      PubDate: 2017-07-23T04:22:51Z
      DOI: 10.1016/j.cis.2017.07.023
       
  • Magnetocapillary self-assemblies: locomotion and micromanipulation along a
           liquid interface
    • Authors: G. Grosjean; M. Hubert; N. Vandewalle
      Abstract: Publication date: Available online 20 July 2017
      Source:Advances in Colloid and Interface Science
      Author(s): G. Grosjean, M. Hubert, N. Vandewalle
      This paper presents an overview and discussion of magnetocapillary self-assemblies. New results are presented, in particular concerning the possible development of future applications. These self-organizing structures possess the notable ability to move along an interface when powered by an oscillatory, uniform magnetic field. The system is constructed as follows. Soft magnetic particles are placed on a liquid interface, and submitted to a magnetic induction field. An attractive force due to the curvature of the interface around the particles competes with an interaction between magnetic dipoles. Ordered structures can spontaneously emerge from these conditions. Furthermore, time-dependent magnetic fields can produce a wide range of dynamic behaviours, including non-time-reversible deformation sequences that produce translational motion at low Reynolds number. In other words, due to a spontaneous breaking of time-reversal symmetry, the assembly can turn into a surface microswimmer. Trajectories have been shown to be precisely controllable. As a consequence, this system offers a way to produce microrobots able to perform different tasks. This is illustrated in this paper by the capture, transport and release of a floating cargo, and the controlled mixing of fluids at low Reynolds number.
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      PubDate: 2017-07-23T04:22:51Z
      DOI: 10.1016/j.cis.2017.07.019
       
  • Critical evaluation of dipolar, acid-base and charge interactions. II.
           Charge exchange within electrolytes and electron exchange with
           semiconductors
    • Authors: Jarl B. Rosenholm
      Abstract: Publication date: Available online 19 July 2017
      Source:Advances in Colloid and Interface Science
      Author(s): Jarl B. Rosenholm
      Electron displacements may be considered as a general measure of semiconductor activity as well as of dipolar, acid-base and charge interactions. Electron transfers during reduction and oxidation reactions between dissolved cations and anions correspond to an extreme Lewis acid-base electron displacement. Brϕnsted proton release (protolysis) represents an extremely weakened hydrogen bond. The most common electrostatic (Born, PCM) and chemical (pK a matching) models for electron and proton exchange between dissolved species are reviewed using aluminium species as examples. Dissolution of ions from solids (salts) may be considered as a reversed precipitation reaction. For partly covalent solids dissociation is dependent on electron or vacancy (hole) transfers to the solid which connects oxidation and reduction reactions to electron displacements in semiconductors. The electron exchange is characterized by Femi energy of semiconductors and of electrolytes. The standard reduction potential may thus be converted to Fermi energy of connected electrochemical cells. In disconnected particle suspensions (sols) the electron activity is a more appropriate parameter which may be converted both to standard reduction potential of ions and to Fermi energy of semiconductors. Dissolution of potential determining cations and anions and hydrolysis of surface sites determines the charging (electron transfer to/from surface) of solids. Both electrostatic (MUSIC) and chemical equilibrium constant models are available for Brϕnsted equilibrium of surface hydroxyls. Point of zero charge is a result of positive and negative charge matching and it represents the optimal condition for condensation of polynuclear species by olation and oxolation. The capability of partial charge (PCM) model to predict condensation is evaluated. Acidity (pH), composition and temperature dependence of aluminium species is illustrated by solubility limits of contributing species and by phase diagrams. Influence of ions on macroscopic suspension properties, such as wetting and electrophoretic mobility is evaluated with reference to point of zero charge and to isoelectric point. Restrictions to the use of zeta-potentials are related to the surface potential and particle size – Debye length ratios. Macroscopic settling (particle precipitation) and viscosity of suspensions (sols) are discussed with reference to Deryagin-Landau-Verwey-Overbeek (DLVO) model. The primary dependence on counterion valence is evaluated according to Schulz-Hardy approach. The secondary dependence on counterion hydration (Hofmeister or lyotropic effect) and ion association (Debye-Hückel limiting model) are discussed.
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      PubDate: 2017-07-23T04:22:51Z
      DOI: 10.1016/j.cis.2017.07.010
       
  • Films of Bacteria at Interfaces
    • Authors: Liana Vaccari; Mehdi Molaei; Tagbo H.R. Niepa; Daeyeon Lee; Robert L. Leheny; Kathleen J. Stebe
      Abstract: Publication date: Available online 19 July 2017
      Source:Advances in Colloid and Interface Science
      Author(s): Liana Vaccari, Mehdi Molaei, Tagbo H.R. Niepa, Daeyeon Lee, Robert L. Leheny, Kathleen J. Stebe
      Bacteria are often discussed as active colloids, self-propelled organisms whose collective motion can be studied in the context of non-equilibrium statistical mechanics. In such studies, the behavior of bacteria confined to interfaces or in the proximity of an interface plays an important role. For instance, many studies have probed collective behavior of bacteria in quasi two-dimensional systems such as soap films. Since fluid interfaces can adsorb surfactants and other materials, the stress and velocity boundary conditions at interfaces can alter bacteria motion; hydrodynamic studies of interfaces with differing boundary conditions are reviewed. Also, bacteria in bulk can become trapped at or near fluid interfaces, where they colonize and form structures comprising secretions like exopolysaccharides, surfactants, living and dead bacteria, thereby creating Films of Bacteria at Interfaces (FBI). The formation of FBI is discussed at air-water, oil-water, and water-water interfaces, with an emphasis on film mechanics, and with some allusion to genetic functions guiding bacteria to restructure fluid interfaces. At air-water interfaces, bacteria form pellicles or interfacial biofilms. Studies are reviewed that reveal that pellicle material properties differ for different strains of bacteria, and that pellicle physicochemistry can act as a feedback mechanism to regulate film formation. At oil-water interfaces, a range of FBI form, depending on bacteria strain. Some bacteria-laden interfaces age from an initial active film, with dynamics dominated by motile bacteria, through viscoelastic states, to form an elastic film. Others remain active with no evidence of elastic film formation even at significant interface ages. Finally, bacteria can adhere to and colonize ultra-low surface tension interfaces such as aqueous-aqueous systems common in food industries. Relevant literature is reviewed, and areas of interest for potential application are discussed, ranging from health to bioremediation.
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      PubDate: 2017-07-23T04:22:51Z
      DOI: 10.1016/j.cis.2017.07.016
       
  • The enzymatic sphingomyelin to ceramide conversion increases the shear
           membrane viscosity at the air-water interface
    • Authors: Elisa R. Catapano; Paolo Natale; Francisco Monroy; Iván López-Montero
      Abstract: Publication date: Available online 19 July 2017
      Source:Advances in Colloid and Interface Science
      Author(s): Elisa R. Catapano, Paolo Natale, Francisco Monroy, Iván López-Montero
      Whereas most of lipids have viscous properties and they do not have significant elastic features, ceramides behave as very rigid solid assemblies, displaying viscoelastic behaviour at physiological temperatures. The present review addresses the surface rheology of lipid binary mixtures made of sphingomyelin and ceramide. However, ceramide is formed by the enzymatic cleavage of sphingomyelin in cell plasma membranes. The consequences of the enzymatically-driven ceramide formation involve mechanical alterations of the embedding membrane. Here, an increase on surface shear viscosity was evidenced upon enzymatic incubation of sphingomyelin monolayers. The overall rheological data are discussed in terms of the current knowledge of the thermotropic behaviour of ceramide-containing model membranes.
      Graphical abstract image

      PubDate: 2017-07-23T04:22:51Z
      DOI: 10.1016/j.cis.2017.07.014
       
  • Dissipative dynamics of fluid lipid membranes enriched in cholesterol
    • Authors: Laura R. Arriaga; Ruddi Rodríguez-García; Lara H. Moleiro; Sylvain Prévost; Iván López-Montero; Thomas Hellweg; Francisco Monroy
      Abstract: Publication date: Available online 18 July 2017
      Source:Advances in Colloid and Interface Science
      Author(s): Laura R. Arriaga, Ruddi Rodríguez-García, Lara H. Moleiro, Sylvain Prévost, Iván López-Montero, Thomas Hellweg, Francisco Monroy
      Cholesterol is an intriguing component of fluid lipid membranes: It makes them stiffer but also more fluid. Despite the enormous biological significance of this complex dynamical behavior, which blends aspects of membrane elasticity with viscous friction, their mechanical bases remain however poorly understood. Here, we show that the incorporation of physiologically relevant contents of cholesterol in model fluid membranes produces a fourfold increase in the membrane bending modulus. However, the increase in the compression rigidity that we measure is only twofold; this indicates that cholesterol increases coupling between the two membrane leaflets. In addition, we show that although cholesterol makes each membrane leaflet more fluid, it increases the friction between the membrane leaflets. This dissipative dynamics causes opposite but advantageous effects over different membrane motions: It allows the membrane to rearrange quickly in the lateral dimension, and to simultaneously dissipate out-of-plane stresses through friction between the two membrane leaflets. Moreover, our results provide a clear correlation between coupling and friction of membrane leaflets. Furthermore, we show that these rigid membranes are optimal to resist slow deformations with minimum energy dissipation; their optimized stability might be exploited to design soft technological microsystems with an encoded mechanics, vesicles or capsules for instance, useful beyond classical applications as model biophysical systems.
      Graphical abstract image

      PubDate: 2017-07-23T04:22:51Z
      DOI: 10.1016/j.cis.2017.07.007
       
  • Self-assembly, phase behaviour and structural behaviour as observed by
           scattering for classical and non-classical microemulsions
    • Authors: Michael Gradzielski; Sylvain Prévost; Thomas Zemb
      Abstract: Publication date: Available online 18 July 2017
      Source:Advances in Colloid and Interface Science
      Author(s): Michael Gradzielski, Sylvain Prévost, Thomas Zemb
      In this review, we discuss the conditions for forming microemulsions, systems which are thermodynamically stable mixtures of oil and water made stable by the presence of an interfacial film containing surface active molecules. There are several types of microemulsions, depending largely on the stiffness of the amphiphilic monolayer that separates the oily and the aqueous micro-domain. We first discuss and compare the phase behaviour of these different types, starting from the classical microemulsion made from a flexible surfactant film but then also moving on to less classical situations: this occurs when the interfacial film is stiff or when microemulsions are formed in the absence of a classical surfactant. In the second part, we relate these different microemulsion types to the structural features as can be determined via different methodologies by small angle scattering (SAS). Using absolute scaling, general theorems as well as fitting under constraints or to pre-supposed shapes in real space or correlation functions in reciprocal space allows to classify all microemulsions into classical flexible, rigid or ultra-flexible microemulsions with either globular, connected cylinder of locally flat interfaces, with the corresponding conductivity and phase stability properties.
      Graphical abstract image

      PubDate: 2017-07-23T04:22:51Z
      DOI: 10.1016/j.cis.2017.07.022
       
  • Surface hydrodynamics of viscoelastic fluids and soft solids: Surfing bulk
           rheology on capillary and Rayleigh waves
    • Authors: Francisco Monroy
      Abstract: Publication date: Available online 18 July 2017
      Source:Advances in Colloid and Interface Science
      Author(s): Francisco Monroy
      From the recent advent of the new soft-micro technologies, the hydrodynamic theory of surface modes propagating on viscoelastic bodies has reinvigorated this field of technology with interesting predictions and new possible applications, so recovering its scientific interest very limited at birth to the academic scope. Today, a myriad of soft small objects, deformable meso- and micro-structures, and macroscopically viscoelastic bodies fabricated from colloids and polymers are already available in the materials catalogue. Thus, one can envisage a constellation of new soft objects fabricated by-design with a functional dynamics based on the mechanical interplay of the viscoelastic material with the medium through their interfaces. In this review, we recapitulate the field from its birth and theoretical foundation in the latest 1980s up today, through its flourishing in the 90s from the prediction of extraordinary Rayleigh modes in coexistence with ordinary capillary waves on the surface of viscoelastic fluids, a fact first confirmed in experiments by Dominique Langevin and me with soft gels [Monroy and Langevin, Phys. Rev. Lett. 81, 3167 (1998)]. With this observational discovery at sight, we not only settled the theory previously formulated a few years before, but mainly opened a new field of applications with soft materials where the mechanical interplay between surface and bulk motions matters. Also, new unpublished results from surface wave experiments performed with soft colloids are reported in this contribution, in which the analytic methods of wave surfing synthetized together with the concept of coexisting capillary-shear modes are claimed as an integrated tool to insightfully scrutinize the bulk rheology of soft solids and viscoelastic fluids. This dedicatory to the figure of Dominique Langevin includes an appraisal of the relevant theoretical aspects of the surface hydrodynamics of viscoelastic fluids, and the coverage of the most important experimental results obtained during the three decades of research on this field.
      Graphical abstract image

      PubDate: 2017-07-23T04:22:51Z
      DOI: 10.1016/j.cis.2017.07.006
       
  • Emulsion templated vesicles with symmetric or asymmetric membranes
    • Authors: Yuting Huang; Shin-Hyun Kim; Laura R. Arriaga
      Abstract: Publication date: Available online 17 July 2017
      Source:Advances in Colloid and Interface Science
      Author(s): Yuting Huang, Shin-Hyun Kim, Laura R. Arriaga
      Emulsion droplets with well-controlled topologies are used as templates for forming vesicles with either symmetric or asymmetric membranes. This review summarizes the available technology to produce these templates, the strategies and critical parameters involved in the transformation of emulsion droplets into vesicles, and the properties of the generated vesicles, with a special focus on the composition and material distribution of the vesicle membrane. Here, we also address limitations in the field and point to future fundamental and applied research in the area.
      Graphical abstract image

      PubDate: 2017-07-23T04:22:51Z
      DOI: 10.1016/j.cis.2017.07.013
       
  • Structure, interfacial film properties, and thermal fluctuations of
           microemulsions as seen by scattering experiments
    • Authors: Julian Oberdisse; Thomas Hellweg
      Abstract: Publication date: Available online 16 July 2017
      Source:Advances in Colloid and Interface Science
      Author(s): Julian Oberdisse, Thomas Hellweg
      The physics of microemulsions and in particular Dominique Langevin’s contributions to the understanding of microemulsion structure and bending properties using scattering techniques are reviewed. Among the many methods used by her and her co-workers, we particularly emphasize optical techniques and small angle neutron scattering (SANS), but also neutron spin echo spectroscopy (NSE). The review is then extended to more recent studies of properties of microemulsions close to surfaces, using reflectometry and grazing-incidence small angle neutron scattering (GISANS).

      PubDate: 2017-07-23T04:22:51Z
      DOI: 10.1016/j.cis.2017.07.011
       
  • Toward the development of biomimetic injectable and macroporous
           biohydrogels for regenerative medicine
    • Authors: Killian Flegeau; Richard Pace; Hélène Gautier; Gildas Rethore; Jerome Guicheux; Catherine Le Visage; Pierre Weiss
      Abstract: Publication date: Available online 16 July 2017
      Source:Advances in Colloid and Interface Science
      Author(s): Killian Flegeau, Richard Pace, Hélène Gautier, Gildas Rethore, Jerome Guicheux, Catherine Le Visage, Pierre Weiss
      Graphical abstract image

      PubDate: 2017-07-23T04:22:51Z
      DOI: 10.1016/j.cis.2017.07.012
       
  • Permeability modes in fluctuating lipid membranes with DNA-translocating
           pores
    • Authors: L.H. Moleiro; M. Mell; R. Bocanegra; I. López-Montero; P. Fouquet; Th. Hellweg; J.L. Carrascosa; F. Monroy
      Abstract: Publication date: Available online 16 July 2017
      Source:Advances in Colloid and Interface Science
      Author(s): L.H. Moleiro, M. Mell, R. Bocanegra, I. López-Montero, P. Fouquet, Th. Hellweg, J.L. Carrascosa, F. Monroy
      Membrane pores can significantly alter not only the permeation dynamics of biological membranes but also their elasticity. Large membrane pores able to transport macromolecular contents represent an interesting model to test theoretical predictions that assign active-like (non-equilibrium) behavior to the permeability contributions to the enhanced membrane fluctuations existing in permeable membranes [Maneville et al. Phys. Rev. Lett. 82, 4356 (1999)]. Such high-amplitude active contributions arise from the forced transport of solvent and solutes through the open pores, which becomes even dominant at large permeability. In this paper, we present a detailed experimental analysis of the active shape fluctuations that appear in highly permeable lipid vesicles with large macromolecular pores inserted in the lipid membrane, which are a consequence of transport permeability events occurred in an osmotic gradient. The experimental results are found in quantitative agreement with theory, showing a remarkable dependence with the density of membrane pores and giving account of mechanical compliances and permeability rates that are compatible with the large size of the membrane pore considered. The presence of individual permeation events has been detected in the fluctuation time-series, from which a stochastic distribution of the permeation events compatible with a shot-noise has been deduced. The non-equilibrium character of the membrane fluctuations in a permeation field, even if the membrane pores are mere passive transporters, is clearly demonstrated. Finally, a bio-nano-technology outlook of the proposed synthetic concept is given on the context of prospective uses as active membrane DNA-pores exploitable in gen-delivery applications based on lipid vesicles.
      Graphical abstract image

      PubDate: 2017-07-23T04:22:51Z
      DOI: 10.1016/j.cis.2017.07.009
       
  • Different approaches to study protein films at air/water interface
    • Abstract: Publication date: Available online 15 July 2017
      Source:Advances in Colloid and Interface Science
      Author(s): María José Gálvez-Ruiz
      In this review classical studies on insoluble liquid monolayers formed by proteins are examined and compared. It has been focused the attention on the information that it is possible to obtain from the π-a isotherms recorded by compression of the monolayers. In recent decades new techniques have developed, mainly microscopy, that provide valuable information on the behavior and structure of fluid films. However, frequently the data are difficult to interpret and require a previous thermodynamic study of them on the basis of the surface tension (or surface pressure) as a function of the molecular area measurement. The main aim of this paper is to underline that surface balance type of Langmuir is a powerful technique since it enables to obtain information at molecular level from a macroscopic analysis. Notably, this information is revealed very interesting when it comes to studying protein films. From this point of view it has been reviewed the study methods and results for four proteins.
      Graphical abstract image

      PubDate: 2017-07-23T04:22:51Z
       
  • Bubble-bubble interactions in a 2D foam, close to the wet limit
    • Authors: D. Weaire; R. Höhler; S. Hutzler
      Abstract: Publication date: Available online 13 July 2017
      Source:Advances in Colloid and Interface Science
      Author(s): D. Weaire, R. Höhler, S. Hutzler
      Following the general approach of Morse and Witten for the deformation of a bubble in contact with neighbouring bubbles, we develop a model for contacting bubbles in two dimensions which can be solved analytically. The force-displacement relations are derived by elementary methods; unlike the case of 3d, no logarithmic factors arise in two dimensions. We also discuss the case of a uniform compression of a symmetric foam structure; the (osmotic) compressibility depends on the number of contacts, as was shown in earlier work by Lacasse et al. Our model, which is based on first principles, without any free parameters, may be extended to simulate 2d foams.

      PubDate: 2017-07-23T04:22:51Z
      DOI: 10.1016/j.cis.2017.07.004
       
  • From drop-shape analysis to stress-fitting elastometry
    • Authors: Mathias Nagel; Theo A. Tervoort; Jan Vermant
      Abstract: Publication date: Available online 13 July 2017
      Source:Advances in Colloid and Interface Science
      Author(s): Mathias Nagel, Theo A. Tervoort, Jan Vermant
      Drop-shape analysis using pendant or sessile drops is a well-established experimental technique for measuring the interfacial or surface tension, and changes thereof. The method relies on deforming a drop by either gravity or buoyancy and fitting the Young–Laplace equation to the drop shape. Alternatively one can prescribe the shape and measure the pressure inside the drop or bubble using pressure tensiometry. However, when an interface with a complex microstructure is present, extra and anisotropic interfacial stresses may develop due to lateral interactions between the surface-active moieties, leading to deviations of the drop shape or even a wrinkling of the interface. To extract surface-material properties of these complex interfaces using drop-shape analysis or pressure tensiometry, the Young–Laplace law needs to be generalized in order to account for the extra and anisotropic stresses at the interface. In the present work, we review the different approaches that have been proposed to date to extract the surface tension as the thermodynamic state variable, as well as other rheological material properties such as the compression and the shear modulus. To evaluate the intrinsic performance of the methods, computer generated drops are subjected to step-area changes and then subjected to analysis using the different methods. Shape-fitting methods, now combined with an adequate constitutive method, do however perform rather poorly in determining the elastic stresses, especially at small area strains. An additional measurement o f the pressure or capillary-pressure tensiometry is required to improve the sensitivity. However, pressure-based methods still require the knowledge of the undeformed reference state, which may be difficult to achieve in practice. Moreover, it is not straightforward to judge from what point onwards one needs to go beyond the Young–Laplace equation. To overcome these limitations, a method based on stress fitting, which uses a local force balance method, is introduced here. One aspect of this new method is the use of the Chebyshev transform to numerically describe the contour shape of the drop interface. For all methods we present a detailed error analysis to evaluate if, and with what precision, surface material parameters can be extracted. Depending on the desired information, different ideal experimental conditions and most suitable methods are discussed, in addition to having a criterion to investigate if extra and anisotropic stresses matter.
      Graphical abstract image

      PubDate: 2017-07-23T04:22:51Z
      DOI: 10.1016/j.cis.2017.07.008
       
  • Polymers and Surfactants at Fluid Interfaces Studied with Specular Neutron
           Reflectometry
    • Authors: Larissa Braun; Martin Uhlig; Regine von Klitzing; Richard A. Campbell
      Abstract: Publication date: Available online 12 July 2017
      Source:Advances in Colloid and Interface Science
      Author(s): Larissa Braun, Martin Uhlig, Regine von Klitzing, Richard A. Campbell
      This review addresses the advances made with specular neutron reflectometry in studies of aqueous mixtures of polymers and surfactants at fluid interfaces during the last decade. The increase in neutron flux due to improvements in instrumentation has led to routine measurements at the air/water interface that are both faster and involve samples with low isotopic contrast. One can now resolve the surface excess of a single deuterated component in one second and the composition of a mixture on the minute time scale, and information about adsorption processes and dynamic rheology can also be accessed. Research areas addressed include the types of formed equilibrium surface structures, the link to the foam film stability and the range of non-equilibrium effects that dominate the behavior of oppositely charged polyelectrolyte/surfactant mixtures, macroscopic film formation in like-charged polymer/surfactant mixtures, and the properties of mixtures of bio-polymers with surfactants and phospholipids.
      Graphical abstract image

      PubDate: 2017-07-23T04:22:51Z
      DOI: 10.1016/j.cis.2017.07.005
       
  • Dynamics of Network Fluids
    • Authors: C.S. Dias; N.A.M. Araújo; M.M. Telo da Gama
      Abstract: Publication date: Available online 6 July 2017
      Source:Advances in Colloid and Interface Science
      Author(s): C.S. Dias, N.A.M. Araújo, M.M. Telo da Gama
      Network fluids are structured fluids consisting of chains and branches. They are characterized by unusual physical properties, such as, exotic bulk phase diagrams, interfacial roughening and wetting transitions, and equilibrium and nonequilibrium gels. Here, we provide an overview of a selection of their equilibrium and dynamical properties. Recent research efforts towards bridging equilibrium and non-equilibrium studies are discussed, as well as several open questions.
      Graphical abstract image

      PubDate: 2017-07-09T03:55:41Z
      DOI: 10.1016/j.cis.2017.07.001
       
  • Formation of protein/surfactant adsorption layer as studied by dilational
           surface rheology
    • Authors: Boris A. Noskov; Michael M. Krycki
      Abstract: Publication date: Available online 6 July 2017
      Source:Advances in Colloid and Interface Science
      Author(s): Boris A. Noskov, Michael M. Krycki
      The review discusses the mechanism of formation of protein/surfactant adsorption layers at the liquid – gas interface. The complexes of globular proteins usually preserve their compact structure a low surfactant concentrations. Therefore a simple kinetic model of the adsorption of charged compact nanoparticles is discussed first and compared with experimental data. The increase of surfactant concentrations results in various conformational transitions in the surface layer. One can obtain information on the changes of the adsorption layer structure using the dilational surface rheology. The kinetic dependencies of the dynamic surface elasticity are strongly different for the adsorption of unfolded macromolecules and compact globules, and have local maxima in the former case corresponding to different steps of the adsorption. These distinctions allow tracing the changes of the tertiary structure of protein/surfactant complexes in the surface layer. The adsorption from mixed solutions of ionic surfactants with β-casein, β-lactoglobulin, bovine serum albumin and myoglobin is discussed with some details.
      Graphical abstract image

      PubDate: 2017-07-09T03:55:41Z
      DOI: 10.1016/j.cis.2017.07.003
       
  • Advances and challenges in the rheology of concentrated emulsions and
           nanoemulsions
    • Authors: Ha Seong Kim; Thomas G. Mason
      Abstract: Publication date: Available online 5 July 2017
      Source:Advances in Colloid and Interface Science
      Author(s): Ha Seong Kim, Thomas G. Mason
      We review advances made in the rheology of concentrated emulsions and nanoemulsions, which can serve as model soft materials that have highly tunable viscoelastic properties near the jamming point. Droplet interfacial and positional structures are shown to influence emulsion rheological properties such as viscoelasticity, yielding, and flow behavior via presentation of recent experimentation and theoretical models. We emphasize studies of emulsions composed of monodisperse droplets since these have led to breakthroughs in fundamental understanding. In addition, we summarize experiments which demonstrate that emulsions can have material memory and rheological properties that depend on the applied flow history, since these can affect droplet interfacial and positional structures. We also cover the rheology of attractive emulsions, which can still have a dominant elasticity at droplet volume fractions far below jamming.
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      PubDate: 2017-07-09T03:55:41Z
      DOI: 10.1016/j.cis.2017.07.002
       
  • Impact of albumin based approaches in nanomedicine: Imaging, targeting and
           drug delivery
    • Authors: Bharat Bhushan; Vitaly Khanadeev; Boris Khlebtsov; Nikolai Khlebtsov; P. Gopinath
      Abstract: Publication date: Available online 1 July 2017
      Source:Advances in Colloid and Interface Science
      Author(s): Bharat Bhushan, Vitaly Khanadeev, Boris Khlebtsov, Nikolai Khlebtsov, P. Gopinath
      A major challenge in the field of nanomedicine is to transform laboratory innovations into commercially successful clinical products. In this campaign, a variety of nanoenabled approaches have been designed and investigated for their role in biomedical applications. The advantages associated with the unique structure of albumin imparts it with the ability to interact with variety of molecules, while the functional groups present on their surface provide base for large number of modifications making it as an ideal nanocarrier system. So far, a variety of albumin based nanoenabled approaches have been intensively exploited for effective diagnosis and personalized medicine, among them some have successfully completed their journey from lab bench to marketed products. This review focuses on the recent most promising advancement in the field of albumin based nanoenabled approaches for various biomedical applications and their potential use in cancer diagnosis and therapy.
      Graphical abstract image

      PubDate: 2017-07-09T03:55:41Z
      DOI: 10.1016/j.cis.2017.06.012
       
  • Relationship between processing history and functionality recovery after
           rehydration of dried cellulose-based suspensions: A critical review
    • Authors: Isabelle Déléris; Joël Wallecan
      Abstract: Publication date: Available online 30 June 2017
      Source:Advances in Colloid and Interface Science
      Author(s): Isabelle Déléris, Joël Wallecan
      Cellulose-based suspensions have raised more and more attention due to their broad range of properties that can be used in paper industry and material science but also in medicine, nanotechnology and food science. Their final functionality is largely dependent on their processing history and notably the structural modifications that occur during drying and rehydration. The purpose of this work is to make a state-of-the-art contribution to the mechanisms involved in the process-structure-function relationships of cellulose-based hydrogels. The different assumptions that exist in the literature are reviewed taking the key role of the initial sample characteristics as well as the processing conditions into consideration. The decrease in swelling ability after drying is clearly due to an overall shrinkage of the structure of the material. At microscale, pore closure and cellulosic fibril aggregation are mentioned as the main reasons. The origins of such irreversible structural modifications take place at molecular level and is mainly explained by the establishment of a new balance of interactions between all components. Nevertheless, the respective contribution of each interaction are still under investigation.
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      PubDate: 2017-07-09T03:55:41Z
      DOI: 10.1016/j.cis.2017.06.013
       
  • Micro and nanobubble technologies as a new horizon for water-treatment
           techniques: A review
    • Authors: Tatek Temesgen; Thi Thuy Bui; Mooyoung Han; Tschung-il Kim; Hyunju Park
      Abstract: Publication date: Available online 27 June 2017
      Source:Advances in Colloid and Interface Science
      Author(s): Tatek Temesgen, Thi Thuy Bui, Mooyoung Han, Tschung-il Kim, Hyunju Park
      This review article organizes the studies conducted on the areas of microbubbles and nanobubbles with a special emphasis on water treatment. The basic definitions of bubble types and their size ranges are also presented based on the explanations of different researchers. The characterization parameters with state-of-the-art measuring and analysis techniques of microbubble and nanobubble technologies are summarized. Some major applications of these technologies in water-treatment processes are reviewed and briefly discussed. Based on the reviews, various potential areas for research and bubble application gaps in water and wastewater treatment technologies are identified for further study. The article is prepared in such a way that it provides a step-by-step acquaintance to the subject matter with the objective of focusing on the application of microbubbles and nanobubbles in water-treatment technology.
      Graphical abstract image

      PubDate: 2017-06-29T03:08:17Z
      DOI: 10.1016/j.cis.2017.06.011
       
  • Synthesis of some transition metal (M: 25Mn, 27Co, 28Ni, 29Cu, 30Zn, 47Ag,
           48Cd) sulfide nanostructures by hydrothermal method
    • Authors: Hamid Emadi; Masoud Salavati-Niasari; Azam Sobhani
      Abstract: Publication date: Available online 16 June 2017
      Source:Advances in Colloid and Interface Science
      Author(s): Hamid Emadi, Masoud Salavati-Niasari, Azam Sobhani
      The design of nanostructures with favored shape, particle size and structure is one of the most important fields of nanoscience. To reach this target hydrothermal method is one of the most applicable methods which allow us to obtain favored structures by changing some parameters. This review focuses on synthesis of some transition metal sulfides by hydrothermal method because of technological importance of this group of material. The common sulfides of Mn, Co, Ni, Cu, Zn, Ag and Cd are introduced and a mechanism proposed for their synthesis. The effects of temperature and time reaction, surfactant, reactants concentration, metal and sulfur sources and etc. on the morphology, particle size and some properties of the products are investigated. SEM and TEM images show the morphology and size of the as-synthesized samples. Chemical composition of the samples is characterized by XRD, EDS and etc. The magnetic, optical and thermoelectric properties of the metal sulfides are investigated.
      Graphical abstract image

      PubDate: 2017-06-21T11:00:39Z
      DOI: 10.1016/j.cis.2017.06.007
       
  • ifc (ed board)
    • Abstract: Publication date: July 2017
      Source:Advances in Colloid and Interface Science, Volume 245


      PubDate: 2017-06-15T01:39:24Z
       
  • Continuum-based models and concepts for the transport of nanoparticles in
           saturated porous media: A state-of-the-science review
    • Authors: Peyman Babakhani; Jonathan Bridge; Ruey-an Doong; Tanapon Phenrat
      Abstract: Publication date: Available online 7 June 2017
      Source:Advances in Colloid and Interface Science
      Author(s): Peyman Babakhani, Jonathan Bridge, Ruey-an Doong, Tanapon Phenrat
      Environmental applications of NP increasingly result in widespread NP distribution within porous media where they are subject to various concurrent transport mechanisms including irreversible deposition, attachment/detachment (equilibrium or kinetic), agglomeration, physical straining, site-blocking, ripening, and size exclusion. Fundamental research in NP transport is typically conducted at small scale, and theoretical mechanistic modeling of particle transport in porous media faces challenges when considering the simultaneous effects of transport mechanisms. Continuum modeling approaches, in contrast, are scalable across various scales ranging from column experiments to aquifer. They have also been able to successfully describe the simultaneous occurrence of various transport mechanisms of NP in porous media such as blocking/straining or agglomeration/deposition/detachment. However, the diversity of model equations developed by different authors and the lack of effective approaches for their validation present obstacles to the successful robust application of these models for describing or predicting NP transport phenomena. This review aims to describe consistently all the important NP transport mechanisms along with their representative mathematical continuum models as found in the current scientific literature. Detailed characterizations of each transport phenomenon in regards to their manifestation in the column experiment outcomes, i.e., breakthrough curve (BTC) and residual concentration profile (RCP), are presented to facilitate future interpretations of BTCs and RCPs. The review highlights two NP transport mechanisms, agglomeration and size exclusion, which are potentially of great importance in controlling the fate and transport of NP in the subsurface media yet have been widely neglected in many existing modeling studies. A critical limitation of the continuum modeling approach is the number of parameters used upon application to larger scales and when a series of transport mechanisms are involved. We investigate the use of simplifying assumptions, such as the equilibrium assumption, in modeling the attachment/detachment mechanisms within a continuum modelling framework. While acknowledging criticisms about the use of this assumption for NP deposition on a mechanistic (process) basis, we found that its use as a description of dynamic deposition behavior in a continuum model yields broadly similar results to those arising from a kinetic model. Furthermore, we show that in two dimensional (2-D) continuum models the modeling efficiency based on the Akaike information criterion (AIC) is enhanced for equilibrium vs kinetic with no significant reduction in model performance. This is because fewer parameters are needed for the equilibrium model compared to the kinetic model. Two major transport regimes are identified in the transport of NP within porous media. The first regime is characterized by higher particle-surface attachment affinity than particle-particle attachment affinity, and operative transport mechanisms of physicochemical filtration, blocking, and physical retention. The second regime is characterized by the domination of particle-particle attachment tendency over particle-surface affinity. In this regime although physicochemical filtration as well as straining may still be operative, ripening is predominant together with agglomeration and further subsequent retention. In both regimes careful assessment of NP fate and transport is necessary since certain combinations of concurrent transport phenomena leading to large migration distances are possible in either case.
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      PubDate: 2017-06-11T01:37:08Z
      DOI: 10.1016/j.cis.2017.06.002
       
  • Multicomponent nanocrystals with anti-Stokes luminescence as contrast
           agents for modern imaging techniques
    • Authors: A.N. Generalova; B.N. Chichkov; E.V. Khaydukov
      Abstract: Publication date: Available online 4 May 2017
      Source:Advances in Colloid and Interface Science
      Author(s): A.N. Generalova, B.N. Chichkov, E.V. Khaydukov
      Lanthanide-doped upconversion nanoparticles (UCNPs) have recently attracted great attention in theranostics due to their exceptional optical and physicochemical properties, which enable the design of a novel UCNP-based nanoplatform for luminescent imaging, temperature mapping, sensing, and therapy. In addition, UCNPs are considered to be ideal building blocks for development of multimodal probes for cells and whole body imaging, exploiting simple variation of host matrix, dopant ions, and surface chemistry. Modalities responsible for magnetic resonance imaging (MRI), computed tomography (CT), and positron emission tomography (PET)/single-photon emission computed tomography (SPECT) are embedded in a single UC nanocrystal, providing integrating effect over any modality alone in terms of the efficiency and sensitivity for clinical innovative diagnosis through multimodal bioimaging. In particular, we demonstrate applications of UCNPs as a new nanoplatform for optical and multimodal cancer imaging in vitro and in vivo and extend discussions to delivery of UCNP-based therapeutic agents for photodynamic and photothermal cancer treatments.
      Graphical abstract image

      PubDate: 2017-05-07T01:00:57Z
      DOI: 10.1016/j.cis.2017.05.006
       
  • Applications of artificial neural networks for adsorption removal of dyes
           from aqueous solution: A review
    • Authors: Abdol Mohammad Ghaedi; Azam Vafaei
      Abstract: Publication date: Available online 26 April 2017
      Source:Advances in Colloid and Interface Science
      Author(s): Abdol Mohammad Ghaedi, Azam Vafaei
      Artificial neural networks (ANNs) have been widely applied for the prediction of dye adsorption during the last decade. In this paper, the applications of ANN methods, namely multilayer feedforward neural networks (MLFNN), support vector machine (SVM), and adaptive neuro fuzzy inference system (ANFIS) for adsorption of dyes are reviewed. The reported researches on adsorption of dyes are classified into four major categories, such as (i) MLFNN, (ii) ANFIS, (iii) SVM and (iv) hybrid with genetic algorithm (GA) and particle swarm optimization (PSO). Most of these papers are discussed. The further research needs in this field are suggested. These ANNs models are obtaining popularity as approaches, which can be successfully employed for the adsorption of dyes with acceptable accuracy.
      Graphical abstract image

      PubDate: 2017-05-01T02:08:02Z
      DOI: 10.1016/j.cis.2017.04.015
       
  • Colloidal 2D nanosheets of MoS2 and other transition metal dichalcogenides
           through liquid-phase exfoliation
    • Authors: Ekaterina D. Grayfer; Mariia N. Kozlova; Vladimir E. Fedorov
      Abstract: Publication date: Available online 25 April 2017
      Source:Advances in Colloid and Interface Science
      Author(s): Ekaterina D. Grayfer, Mariia N. Kozlova, Vladimir E. Fedorov
      This review focuses on the exfoliation of transition metal dichalcogenides MQ2 (TMD, M=Mo, W etc., Q=S, Se) in liquid media, leading to the formation of 2D nanosheets dispersed in colloids. Nowadays, colloidal dispersions of MoS2, MoSe2, WS2 and other related materials are considered for a wide range of applications, including electronic and optoelectronic devices, energy storage and conversion, sensors for gases, catalysts and catalyst supports, biomedicine etc. We address various methods developed so far for transferring these materials from bulk to nanoscale thickness, and discuss their stabilization and factors influencing it. Long-time known exfoliation through Li intercalation has received renewed attention in recent years, and is recognized as a method yielding highest dispersed concentrations of single-layer MoS2 and related materials. Latest trends in the intercalation/exfoliation approach include electrochemical lithium intercalation, experimenting with various intercalating agents, multi-step intercalation etc. On the other hand, direct sonication in solvents is a much simpler technique that allows one to avoid dangerous reagents, long reaction times and purifying steps. The influence of the solvent characteristics on the colloid formation was closely investigated in numerous recent studies. Moreover, it is being recognized that, besides solvent properties, sonication parameters and solvent transformations may affect the process in a crucial way. The latest data on the interaction of MoS2 with solvents evidences that not only solution thermodynamics should be employed to understand the formation and stabilization of such colloids, but also general and organic chemistry. It appears that due to the sonolysis of the solvents and cutting of the MoS2 layers in various directions, the reactive edges of the colloidal nanosheets may bear various functionalities, which participate in their stabilization in the colloidal state. In most cases, direct exfoliation of MQ2 into colloidal nanosheets is conducted in organic solvents, while a small amount of works report low-concentrated colloids in pure water. To improve the dispersion abilities of transition metal dichalcogenides in water, various stabilizers are often introduced into the reaction media, and their interactions with nanosheets play an important role in the stabilization of the dispersions. Surfactants, polymers and biomolecules usually interact with transition metal dichalcogenide nanosheets through non-covalent mechanisms, similarly to the cases of graphene and carbon nanotubes. Finally, we survey covalent chemical modification of colloidal MQ2 nanosheets, a special and different approach, consisting in the functionalization of MQ2 surfaces with help of thiol chemistry, interaction with electrophiles, or formation of inorganic coordination complexes. The intentional design of surface chemistry of the nanosheets is a very promising way to control their solubility, compatibility with other moieties and incorporation into hybrid structures. Although the scope of the present review is limited to transition metal dichalcogenides, the dispersion in colloids of other chalcogenides (such as NbS3, VS4, Mo2S3 etc.) in many ways follows similar trends. We conclude the review by discussing current challenges in the area of exfoliation of MoS2 and its related materials.
      Graphical abstract image

      PubDate: 2017-05-01T02:08:02Z
      DOI: 10.1016/j.cis.2017.04.014
       
  • Layered double hydroxides as the next generation inorganic anion
           exchangers: Synthetic methods versus applicability
    • Authors: Natalia Chubar; Robert Gilmour; Vasyl Gerda; Matej Mičušík; Maria Omastova; Katja Heister; Pascal Man; Jacques Fraissard; Vladimir Zaitsev
      Abstract: Publication date: Available online 25 April 2017
      Source:Advances in Colloid and Interface Science
      Author(s): Natalia Chubar, Robert Gilmour, Vasyl Gerda, Matej Mičušík, Maria Omastova, Katja Heister, Pascal Man, Jacques Fraissard, Vladimir Zaitsev
      This work is the first report that critically reviews the properties of layered double hydroxides (LDHs) on the level of speciation in the context of water treatment application and dynamic adsorption conditions, as well as the first report to associate these properties with the synthetic methods used for LDH preparation. Increasingly stronger maximum allowable concentrations (MAC) of various contaminants in drinking water and liquid foodstuffs require regular upgrades of purification technologies, which might also be useful in the extraction of valuable substances for reuse in accordance with modern sustainability strategies. Adsorption is the main separation technology that allows the selective extraction of target substances from multicomponent solutions. Inorganic anion exchangers arrived in the water business relatively recently to achieve the newly approved standards for arsenic levels in drinking water. LDHs (or hydrotalcites, HTs) are theoretically the best anion exchangers due to their potential to host anions in their interlayer space, which increases their anion removal capacity considerably. This potential of the interlayer space to host additional amounts of target aqueous anions makes the LDHs superior to bulk anion exchanger. The other unique advantage of these layered materials is the flexibility of the chemical composition of the metal oxide-based layers and the interlayer anions. However, until now, this group of “classical” anion exchangers has not found its industrial application in adsorption and catalysis at the industrial scale. To accelerate application of LDHs in water treatment on the industrial scale, the authors critically reviewed recent scientific and technological knowledge on the properties and adsorptive removal of LDHs from water on the fundamental science level. This also includes review of the research tools useful to reveal the adsorption mechanism and the material properties beyond the nanoscale. Further, these properties are considered in association with the synthetic methods by which the LDHs were produced. Special attention is paid to the LDH properties that are particularly relevant to water treatment, such as exchangeability ease of the interlayer anions and the LDH stability at the solid-water interface. Notably, the LDH properties (e.g., rich speciation, hydration, and the exchangeability ease of the interlayer anions with aqueous anions) are considered in the synthetic strategy context applied to the material preparation. One such promising synthetic method has been developed by the authors who supported their opinions by the unpublished data in addition to reviewing the literature. The reviewing approach allowed for establishing regularities between the parameters: the LDH synthetic method―structure/surface/interlayer―removal―suitability for water treatment. Specifically, this approach allowed for a conclusion about either the unsuitability or promising potential of some synthetic methods (or the removal approaches) used for the preparation of LDHs for water purification at larger scales. The overall reviewing approach undertaken by the authors in this work mainly complements the other reviews on LDHs (published over the past seven to eight years) and for the first time compares the properties of these materials beyond the nanoscale.

      PubDate: 2017-05-01T02:08:02Z
      DOI: 10.1016/j.cis.2017.04.013
       
 
 
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