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Publisher: Elsevier   (Total: 3044 journals)

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Showing 1 - 200 of 3044 Journals sorted alphabetically
AASRI Procedia     Open Access   (Followers: 15)
Academic Pediatrics     Hybrid Journal   (Followers: 22, SJR: 1.402, h-index: 51)
Academic Radiology     Hybrid Journal   (Followers: 21, SJR: 1.008, h-index: 75)
Accident Analysis & Prevention     Partially Free   (Followers: 84, 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: 29, 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: 343, 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: 215, 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: 10, 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)
Acute Pain     Full-text available via subscription   (Followers: 13)
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: 7, SJR: 1.039, h-index: 5)
Additives for Polymers     Full-text available via subscription   (Followers: 21)
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: 17, 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: 26, 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 Dermatology     Full-text available via subscription   (Followers: 12)
Advances in Developmental Biology     Full-text available via subscription   (Followers: 11)
Advances in Digestive Medicine     Open Access   (Followers: 5)
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: 41, 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 Food and Nutrition Research     Full-text available via subscription   (Followers: 48, 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 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: 6)
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: 15, 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: 61)
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: 348, 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: 318, 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: 39, 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: 54, 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: 8)
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)
Alpha Omegan     Full-text available via subscription   (SJR: 0.121, h-index: 9)
ALTER - European J. of Disability Research / Revue Européenne de Recherche sur le Handicap     Full-text available via subscription   (Followers: 8, SJR: 0.158, h-index: 9)
Alzheimer's & Dementia     Hybrid Journal   (Followers: 47, 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: 39, 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: 32, 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: 193, SJR: 2.255, h-index: 171)
American J. of Ophthalmology     Hybrid Journal   (Followers: 56, SJR: 2.803, h-index: 148)
American J. of Ophthalmology Case Reports     Open Access   (Followers: 4)
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: 24, 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: 37, SJR: 1.548, h-index: 152)
Analytical Biochemistry     Hybrid Journal   (Followers: 166, 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: 157, 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  [3044 journals]
  • An interferometric technique to study capillary waves
    • Authors: Laura Cantu'; Antonio Raudino; Mario Corti
      Pages: 23 - 32
      Abstract: Publication date: September 2017
      Source:Advances in Colloid and Interface Science, Volume 247
      Author(s): Laura Cantu', Antonio Raudino, Mario Corti
      We describe a new interferometric technique to study gas-liquid and liquid-liquid interfaces. Bubbles and drops are subjected to an alternating electric field which excites capillary oscillations at the interface, if charged. Bubble or drop deformation is detected by the change of the internal optical path of a laser beam crossing perpendicular to the oscillation axis. Due to the closed geometry, a discrete spectrum of stationary oscillation frequencies (normal modes) is excited. The interferometric nature of the measurement and the resonant nature of the oscillation modes concur in allowing for high sensitivity, in the sub-nanometric region. We present a detailed description of the experimental setup and examples of applications of the technique to the study of both gas-liquid and liquid-liquid interfaces, either naked or with adsorbed surfactant monolayers, for bubbles and drops with diameter~1mm. In particular, the resonance frequencies and the width of the resonance peaks depend on the surface tension and the viscous dampening, respectively. We show that, by this new technique, properties of the interface can be accessed with confidence at the sub-nanometer scale, and surface phenomena, like the monolayer phase transition or the peculiarities of adsorption/desorption processes, can be unraveled in concentration regimes which are too low for existing methods.
      Graphical abstract image

      PubDate: 2017-09-23T16:27:19Z
      DOI: 10.1016/j.cis.2017.06.006
      Issue No: Vol. 247 (2017)
       
  • From drop-shape analysis to stress-fitting elastometry
    • Authors: Mathias Nagel; Theo A. Tervoort; Jan Vermant
      Pages: 33 - 51
      Abstract: Publication date: September 2017
      Source:Advances in Colloid and Interface Science, Volume 247
      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: 2017-09-23T16:27:19Z
      DOI: 10.1016/j.cis.2017.07.008
      Issue No: Vol. 247 (2017)
       
  • Formation of protein/surfactant adsorption layer as studied by dilational
           surface rheology
    • Authors: Boris A. Noskov; Michael M. Krycki
      Pages: 81 - 99
      Abstract: Publication date: September 2017
      Source:Advances in Colloid and Interface Science, Volume 247
      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: 2017-09-23T16:27:19Z
      DOI: 10.1016/j.cis.2017.07.003
      Issue No: Vol. 247 (2017)
       
  • Withdrawing a solid from a bath: How much liquid is coated'
    • Authors: Emmanuelle Rio; François Boulogne
      Pages: 100 - 114
      Abstract: Publication date: September 2017
      Source:Advances in Colloid and Interface Science, Volume 247
      Author(s): Emmanuelle Rio, François Boulogne
      A solid withdrawn from a liquid bath entrains a film. In this review, after recalling the predictions and results for pure Newtonian liquids coated on simple solids, we analyze the deviations to this ideal case exploring successively three potential sources of complexity: the liquid–air interface, the bulk rheological properties of the liquid and the mechanical or chemical properties of the solid. For these different complexities, we show that significant effects on the film thickness are observed experimentally and we summarize the theoretical analysis presented in the literature, which attempt to rationalize these measurements.
      Graphical abstract image

      PubDate: 2017-09-23T16:27:19Z
      DOI: 10.1016/j.cis.2017.01.006
      Issue No: Vol. 247 (2017)
       
  • Dynamic interfacial tension of surfactant solutions
    • Authors: R. Miller; E.V. Aksenenko; V.B. Fainerman
      Pages: 115 - 129
      Abstract: Publication date: September 2017
      Source:Advances in Colloid and Interface Science, Volume 247
      Author(s): R. Miller, E.V. Aksenenko, V.B. Fainerman
      The dynamics of surfactant interfacial layers was first discussed more than a century ago. In 1946 the most important work by Ward and Tordai was published which is still the theoretical basis of all new models to describe the time dependence of interfacial properties. In addition to the diffusion controlled adsorption mechanism, many other models have been postulated in literature, however, well performed experiments with well defined surfactant systems have shown that the diffusional transport is the main process governing the entire formation of surfactant adsorption layers. The main prerequisite, in addition to the diffusional transport, is the consideration of the right boundary condition at the interface, given by a respective equation of state. In addition to the classical models of Langmuir and Frumkin, also the so-called reorientation or interfacial aggregation models are to be assumed to reach a quantitative description of respective experimental data. Moreover, the adsorption of surfactants at the interface between water and a gas phase different from air can be strongly influenced by the type of molecules within the gas phase, such as alkane vapours. These oil molecules co-adsorb from the gas phase and change the adsorption kinetics strongly. Besides the discussion of how to apply theoretical adsorption kinetics models correctly, a large number of experimental data are presented and the way of a quantitative analysis of the adsorption mechanism and the main characteristic parameters is presented. This includes micellar solutions as well as mixtures of surfactants of ionic and non-ionic nature.
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      PubDate: 2017-09-23T16:27:19Z
      DOI: 10.1016/j.cis.2016.12.007
      Issue No: Vol. 247 (2017)
       
  • Polymers and surfactants at fluid interfaces studied with specular neutron
           reflectometry
    • Authors: Larissa Braun; Martin Uhlig; Regine von Klitzing; Richard A. Campbell
      Pages: 130 - 148
      Abstract: Publication date: September 2017
      Source:Advances in Colloid and Interface Science, Volume 247
      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 (or so). The increase in neutron flux due to improvements in instrumentation has led to routine measurements at the air/water interface that are faster and involve samples with lower isotopic contrast than in previous experiments. One can now resolve the surface excess of a single deuterated component on the second time scale 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 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 lipids.
      Graphical abstract image

      PubDate: 2017-09-23T16:27:19Z
      DOI: 10.1016/j.cis.2017.07.005
      Issue No: Vol. 247 (2017)
       
  • Entropy of aqueous surfaces. Application to polymeric Langmuir films
    • Authors: Louise Deschênes; Johannes Lyklema; François St-Germain
      Pages: 149 - 162
      Abstract: Publication date: September 2017
      Source:Advances in Colloid and Interface Science, Volume 247
      Author(s): Louise Deschênes, Johannes Lyklema, François St-Germain
      Measuring surface (excess) entropies provides a bounty of valuable structural information that is hard to obtain otherwise. In the paper these quantities are defined and procedures of measurements discussed. Mostly they involve measurements at different temperatures. A review is given for interfaces with aqueous solutions in the absence of polymers. This review illustrates how, sometimes unanticipated, pieces of information are obtained, for example with cloud seeding and a possible explanation of the Jones-Ray effect. As a novel extension the procedure is applied to deposited, or Langmuir, monolayers of poly(ethylene oxide)-poly(propylene oxide) block copolymers. It will be shown how the various phase transitions and associated configurations of these polymers can be recognized and monitored.
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      PubDate: 2017-09-23T16:27:19Z
      DOI: 10.1016/j.cis.2017.04.004
      Issue No: Vol. 247 (2017)
       
  • Interfacial characteristics of binary polymer blend films spread at the
           air-water interface
    • Authors: Masami Kawaguchi
      Pages: 163 - 171
      Abstract: Publication date: September 2017
      Source:Advances in Colloid and Interface Science, Volume 247
      Author(s): Masami Kawaguchi
      The interfacial characteristics of binary polymer blend films spread at the air-water interface are reviewed, focusing on their surface pressures, interfacial structures, and dilational moduli as a function of the miscibility. Miscible polymer blend films show thermodynamic, structural, and dynamic properties which are a combination of those from both components in the polymer blend present at the air-water interface. No preferential adsorption is observed and the behavior does not depend on the surface concentration regime. In contrast, for immiscible polymer blend films, preferential adsorption of one polymer phase occurs at the air-water interface and the interfacial characteristics in the semi-dilute and concentrated regimes are strongly controlled by one of the components of the adsorbed polymer.
      Graphical abstract image

      PubDate: 2017-09-23T16:27:19Z
      DOI: 10.1016/j.cis.2017.05.004
      Issue No: Vol. 247 (2017)
       
  • How irreversible adsorption affects interfacial properties of polymers
    • Authors: Simone Napolitano; Michele Sferrazza
      Pages: 172 - 177
      Abstract: Publication date: September 2017
      Source:Advances in Colloid and Interface Science, Volume 247
      Author(s): Simone Napolitano, Michele Sferrazza
      Growing experimental evidence shows that the behavior of polymer chains confined at the nanoscale level strongly depends on the degree of adsorption correlated to the number density of monomers pinned onto the supporting substrate. In this contribution, after introducing the physics behind the mechanisms of irreversible adsorption, we review recent experimental observations on how adsorption affects properties of polymer melts confined in 1D, focusing on those related to the thermal glass transition, maximum water uptake, viscosity and crystallization. These findings strongly support a new physical framework of confined soft matter, not trivially limited to finite size effects and interfacial interactions, but also enriched by non-equilibrium phenomena.
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      PubDate: 2017-09-23T16:27:19Z
      DOI: 10.1016/j.cis.2017.02.003
      Issue No: Vol. 247 (2017)
       
  • Electrostatics of patchy surfaces
    • Authors: Ram M. Adar; David Andelman; Haim Diamant
      Pages: 198 - 207
      Abstract: Publication date: September 2017
      Source:Advances in Colloid and Interface Science, Volume 247
      Author(s): Ram M. Adar, David Andelman, Haim Diamant
      In the study of colloidal, biological and electrochemical systems, it is customary to treat surfaces, macromolecules and electrodes as homogeneously charged. This simplified approach is proven successful in most cases, but fails to describe a wide range of heterogeneously charged surfaces commonly used in experiments. For example, recent experiments have revealed a long-range attraction between overall neutral surfaces, locally charged in a mosaic-like structure of positively and negatively charged domains (“patches”). Here, we review experimental and theoretical studies addressing the stability of heterogeneously charged surfaces, their effect on ionic profiles in solution, and the interaction between two such surfaces. We focus on electrostatics, and highlight the important new physical parameters appearing in the heterogeneous case, such as the largest patch size and inter-surface charge correlations.
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      PubDate: 2017-09-23T16:27:19Z
      DOI: 10.1016/j.cis.2017.04.002
      Issue No: Vol. 247 (2017)
       
  • Particles adsorbed at various non-aqueous liquid-liquid interfaces
    • Authors: Miguel Angel Fernandez-Rodriguez; Bernard P. Binks; Miguel Angel Rodriguez-Valverde; Miguel Angel Cabrerizo-Vilchez; Roque Hidalgo-Alvarez
      Pages: 208 - 222
      Abstract: Publication date: September 2017
      Source:Advances in Colloid and Interface Science, Volume 247
      Author(s): Miguel Angel Fernandez-Rodriguez, Bernard P. Binks, Miguel Angel Rodriguez-Valverde, Miguel Angel Cabrerizo-Vilchez, Roque Hidalgo-Alvarez
      Particles adsorbed at liquid interfaces are commonly used to stabilise water-oil Pickering emulsions and water-air foams. The fundamental understanding of the physics of particles adsorbed at water-air and water-oil interfaces is improving significantly due to novel techniques that enable the measurement of the contact angle of individual particles at a given interface. The case of non-aqueous interfaces and emulsions is less studied in the literature. Non-aqueous liquid-liquid interfaces in which water is replaced by other polar solvents have properties similar to those of water-oil interfaces. Nanocomposites of non-aqueous immiscible polymer blends containing inorganic particles at the interface are of great interest industrially and consequently more work has been devoted to them. By contrast, the behaviour of particles adsorbed at oil-oil interfaces in which both oils are immiscible and of low dielectric constant (ε<3) is scarcely studied. Hydrophobic particles are required to stabilise these oil-oil emulsions due to their irreversible adsorption, high interfacial activity and elastic shell behaviour.
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      PubDate: 2017-09-23T16:27:19Z
      DOI: 10.1016/j.cis.2017.02.001
      Issue No: Vol. 247 (2017)
       
  • A comparison between liquid drops and solid particles in partial wetting
    • Authors: Antonio Stocco; Maurizio Nobili
      Pages: 223 - 233
      Abstract: Publication date: September 2017
      Source:Advances in Colloid and Interface Science, Volume 247
      Author(s): Antonio Stocco, Maurizio Nobili
      In this critical review we compare two geometries in partial wetting: a liquid drop on a planar substrate and a spherical particle at a planar liquid interface. We show that this comparison is far from being trivial even if the same physical interactions are at play in both geometries. Similarities and differences in terms of free energies and frictions will be discussed. Contact angle hysteresis, the impact of surface roughness and line pinning on wetting will be described and compared to selected experimental findings.
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      PubDate: 2017-09-23T16:27:19Z
      DOI: 10.1016/j.cis.2017.06.014
      Issue No: Vol. 247 (2017)
       
  • Dynamics of network fluids
    • Authors: C.S. Dias; N.A.M. Araújo; M.M. Telo da Gama
      Pages: 258 - 263
      Abstract: Publication date: September 2017
      Source:Advances in Colloid and Interface Science, Volume 247
      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.
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      PubDate: 2017-09-23T16:27:19Z
      DOI: 10.1016/j.cis.2017.07.001
      Issue No: Vol. 247 (2017)
       
  • Critical evaluation of dipolar, acid-base and charge interactions I.
           Electron displacement within and between molecules, liquids and
           semiconductors
    • Authors: Jarl B. Rosenholm
      Pages: 264 - 304
      Abstract: Publication date: September 2017
      Source:Advances in Colloid and Interface Science, Volume 247
      Author(s): Jarl B. Rosenholm
      Specific dipolar, acid-base and charge interactions involve electron displacements. For atoms, single bonds and molecules electron displacement is characterized by electronic potential, absolute hardness, electronegativity and electron gap. In addition, dissociation, bonding, atomization, formation, ionization, affinity and lattice enthalpies are required to quantify the electron displacement in solids. Semiconductors are characterized by valence and conduction band energies, electron gaps and average Fermi energies which in turn determine Galvani potentials of the bulk, space charge layer and surface states. Electron displacement due to interaction between (probe) molecules, liquids and solids are characterized by parameters such as Hamaker constant, solubility parameter, exchange energy density, surface tension, work of adhesion and immersion. They are determined from permittivity, refractive index, enthalpy of vaporization, molar volume, surface pressure and contact angle. Moreover, acidic and basic probes may form adducts which are adsorbed on target substrates in order to establish an indirect measure of polarity, acidity, basicity or hydrogen bonding. Acidic acceptor numbers (AN), basic donor numbers (DN), acidic and basic “electrostatic” (E) and “covalent” (C) parameters determined by enthalpy of adduct formation are considered as general acid-base scales. However, the formal grounds for assignments as dispersive, Lifshitz-van der Waals, polar, acid, base and hydrogen bond interactions are inconsistent. Although correlations are found no of the parameters are mutually fully compatible and moreover the enthalpies of acid-base interaction do not correspond to free energies. In this review the foundations of different acid-base parameters relating to electron displacement within and between (probe) molecules, liquids and (semiconducting) solids are thoroughly investigated and their mutual relationships are evaluated.
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      PubDate: 2017-09-23T16:27:19Z
      DOI: 10.1016/j.cis.2017.06.004
      Issue No: Vol. 247 (2017)
       
  • Advances and challenges in the rheology of concentrated emulsions and
           nanoemulsions
    • Authors: Ha Seong Kim; Thomas G. Mason
      Pages: 397 - 412
      Abstract: Publication date: September 2017
      Source:Advances in Colloid and Interface Science, Volume 247
      Author(s): Ha Seong Kim, Thomas G. Mason
      We review advances that have been made in the rheology of concentrated emulsions and nanoemulsions, which can serve as model soft materials that have highly tunable viscoelastic properties at droplet volume fractions near and above the glass transition and jamming point. As revealed by experiments, simulations, and theoretical models, interfacial and positional structures of droplets can depend on the applied flow history and osmotic pressure that an emulsion has experienced, thereby influencing its key rheological properties such as viscoelastic moduli, yield stress and strain, and flow behavior. We emphasize studies of monodisperse droplets, since these have led to breakthroughs in the fundamental understanding of dispersed soft matter. This review also covers the rheological properties of attractive emulsions, which can exhibit a dominant elasticity even at droplet volume fractions far below maximal random jamming of hard spheres.
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      PubDate: 2017-09-23T16:27:19Z
      DOI: 10.1016/j.cis.2017.07.002
      Issue No: Vol. 247 (2017)
       
  • Emulsion-based synthesis of porous silica
    • Authors: Hanna Gustafsson; Krister Holmberg
      Pages: 426 - 434
      Abstract: Publication date: September 2017
      Source:Advances in Colloid and Interface Science, Volume 247
      Author(s): Hanna Gustafsson, Krister Holmberg
      We review the use of various types of emulsions as media for synthesis of porous silica particles. The use of high internal phase emulsions, i.e. emulsions with a high ratio of dispersed to continuous phase, is an approach that has attracted considerable attention. Polymerization of the continuous phase followed by removal of the dispersed phase leads to a material with an even distribution of pores if the emulsion droplets are uniform in size. Another route is to use particle stabilized emulsions as template. This will lead to either hydrophilic or hydrophobic porous silica particles depending on whether the templating emulsion is oil-in-water or water-in-oil, respectively. Use of double emulsions as templates is a way to obtain porous particles with hierarchical porosity, usually both macropores and mesopores. Templating amphiphiles, which are often polyoxyethylene-polyoxypropylene-polyoxyethylene block copolymers, are needed in order to obtain materials with highly ordered pore structure. Non-ordered mesoporous silica with small particle size and relatively large pores can be obtained by emulsifying a silica precursor together with an inert solvent in water and allowing the silica to gel within the drops. Hollow silica spheres, i.e. spherical particles with a void in the middle, can be prepared by using emulsion drops as templates around which silica polymerizes. The particles have nanometer-sized pores penetrating the shell.
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      PubDate: 2017-09-23T16:27:19Z
      DOI: 10.1016/j.cis.2017.03.002
      Issue No: Vol. 247 (2017)
       
  • On how hydrogen bonds affect foam stability
    • Authors: Cosima Stubenrauch; Martin Hamann; Natalie Preisig; Vinay Chauhan; Romain Bordes
      Pages: 435 - 443
      Abstract: Publication date: September 2017
      Source:Advances in Colloid and Interface Science, Volume 247
      Author(s): Cosima Stubenrauch, Martin Hamann, Natalie Preisig, Vinay Chauhan, Romain Bordes
      Do intermolecular H-bonds between surfactant head groups play a role for foam stability? From the literature on the foam stability of various surfactants with C12 alkyl chains but different head groups a clear picture emerges: stable foams are only generated when hydrogen bonds can form between the head groups, i.e. when the polar head group has a hydrogen bond donor and a proton acceptor. Stable foams can therefore be generated with surfactants having a sugar unit, a glycine, an amine oxide (at pH~5), or a carboxylic acid (at pH~pKa) as polar head group. On the other hand, aqueous foams stabilized with surfactants having oligo(ethylene oxide), phosphine oxide, quaternary ammonium, sulfate, sarcosine, amine oxide (at pH≠5), or carboxylic acid (at pH≠pKa) are not very stable. These observations suggest that hydrogen bonds between neighbouring molecules at the surface enhance foam stability. Formation of hydrogen bonds between surfactant head groups gives rise to a short-range attractive interaction that may restrict the surfactant's mobility while providing a more elastic surfactant layer which can counteract deformations. To support our hypothesis we carried out a systematic foaming study of two types of surfactants, one of them being capable of forming H-bonds and the other one not. Generating foams of all surfactants mentioned above with the same foaming conditions we found that stable foams are obtained when the head group is capable of forming intersurfactant H-bonds. The outcome of this study constitutes a new step towards the implementation of H-bonds in the future design of surfactants.
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      PubDate: 2017-09-23T16:27:19Z
      DOI: 10.1016/j.cis.2017.02.002
      Issue No: Vol. 247 (2017)
       
  • Non-aqueous foams: Current understanding on the formation and stability
           mechanisms
    • Authors: Anne-Laure Fameau; Arnaud Saint-Jalmes
      Pages: 454 - 464
      Abstract: Publication date: September 2017
      Source:Advances in Colloid and Interface Science, Volume 247
      Author(s): Anne-Laure Fameau, Arnaud Saint-Jalmes
      The most common types of liquid foams are aqueous ones, and correspond to gas bubbles dispersed in an aqueous liquid phase. Non-aqueous foams are also composed of gas bubbles, but dispersed in a non-aqueous solvent. In the literature, articles on such non-aqueous foams are scarce; however, the study of these foams has recently emerged, especially because of their potential use as low calories food products and of their increasing importance in various other industries (such as, for instance, the petroleum industry). Non-aqueous foams can be based on three different foam stabilizers categories: specialty surfactants, solid particles and crystalline particles. In this review, we only focus on recent advances explaining how solid and crystalline particles can lead to the formation of non-aqueous foams, and stabilize them. In fact, as discussed here, the foaming is both driven by the physical properties of the liquid phase and by the interactions between the foam stabilizer and this liquid phase. Therefore, for a given stabilizer, different foaming and stability behavior can be found when the solvent is varied. This is different from aqueous systems for which the foaming properties are only set by the foam stabilizer. We also highlight how these non-aqueous foams systems can easily become responsive to temperature changes or by the application of light.
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      PubDate: 2017-09-23T16:27:19Z
      DOI: 10.1016/j.cis.2017.02.007
      Issue No: Vol. 247 (2017)
       
  • Electrokinetic transport in liquid foams
    • Authors: Oriane Bonhomme; Baptiste Blanc; Laurent Joly; Christophe Ybert; Anne-Laure Biance
      Pages: 477 - 490
      Abstract: Publication date: September 2017
      Source:Advances in Colloid and Interface Science, Volume 247
      Author(s): Oriane Bonhomme, Baptiste Blanc, Laurent Joly, Christophe Ybert, Anne-Laure Biance
      Investigating electrokinetic transport in a liquid foam is at the confluence of two well developed research areas. On one hand, the study of electrokinetic flows (i.e. surface-driven flows generated close to a charged interface) is fairly well understood in regards the solid/liquid interface. On the other hand, the flow of liquid in a 3D deformable network, i.e a foam, under a volume force such as gravity has been thoroughly studied over the past decade. The overlapping zone of these two frameworks is of great interest for both communities as it gives rise to challenging new questions such as: what is the importance of the nature of the charged interface, created by mobile and soluble surfactants in the case of foam, on electrokinetic transport? How does a foam behave when submitted to a surface-driven flow? Can we compensate a volume-driven flow, i.e. gravity, by a surface-driven flow, i.e. electroosmosis? In this review, we will explore these questions on three different scales: a surfactant laden interface, a foam film and a macroscopic foam.
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      PubDate: 2017-09-23T16:27:19Z
      DOI: 10.1016/j.cis.2017.06.005
      Issue No: Vol. 247 (2017)
       
  • Bubble-bubble interactions in a 2d foam, close to the wet limit
    • Authors: D. Weaire; R. Höhler; S. Hutzler
      Pages: 491 - 495
      Abstract: Publication date: September 2017
      Source:Advances in Colloid and Interface Science, Volume 247
      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: 2017-09-23T16:27:19Z
      DOI: 10.1016/j.cis.2017.07.004
      Issue No: Vol. 247 (2017)
       
  • Foams: From nature to industry
    • Authors: Christopher Hill; Julian Eastoe
      Pages: 496 - 513
      Abstract: Publication date: September 2017
      Source:Advances in Colloid and Interface Science, Volume 247
      Author(s): Christopher Hill, Julian Eastoe
      This article discusses different natural and man-made foams, with particular emphasis on the different modes of formation and stability. Natural foams, such as those produced on the sea or by numerous creatures for nests, are generally stabilised by dissolved organic carbon (DOC) molecules or proteins. In addition to this, foam nests are stabilised by multifunctional mixtures of surfactants and proteins called ranaspumins, which act together to give the required physical and biochemical stability. With regards to industrial foams, the article focuses on how various features of foams are exploited for different industrial applications. Stability of foams will be discussed, with the main focus on how the chemical nature and structure of surfactants, proteins and particles act together to produce long-lived stable foams. Additionally, foam destabilisation is considered, from the perspective of elucidation of the mechanisms of instability determined spectroscopically or by scattering methods.
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      PubDate: 2017-09-23T16:27:19Z
      DOI: 10.1016/j.cis.2017.05.013
      Issue No: Vol. 247 (2017)
       
  • The interaction of antimicrobial peptides with membranes
    • Authors: Oksana G. Travkova; Helmuth Moehwald; Gerald Brezesinski
      Pages: 521 - 532
      Abstract: Publication date: September 2017
      Source:Advances in Colloid and Interface Science, Volume 247
      Author(s): Oksana G. Travkova, Helmuth Moehwald, Gerald Brezesinski
      The interaction of antimicrobial peptides (AMPs) with biological membranes is in the focus of research since several years, and the most important features and modes of action of AMPs are described in this review. Different model systems can be used to understand such interactions on a molecular level. As a special example, we use 2D and 3D model membranes to investigate the interaction of the natural cyclic (Ar-1) and the synthetic linear molecule arenicin with selected amphiphiles and phospholipids. A panoply of sophisticated methods has been used to analyze these interactions on a molecular level. As a general trend, one observes that cationic antimicrobial peptides do not interact with cationic amphiphiles due to electrostatic repulsion, whereas with non-ionic amphiphiles, the peptide interacts only with aggregated systems and not with monomers. The interaction is weak (hydrophobic interaction) and requires an aggregated state with a large surface (cylindrical micelles). Anionic amphiphiles (as monomers or micelles) exhibit strong electrostatic interactions with the AMPs leading to changes in the peptide conformation. Both types of peptides interact strongly with anionic phospholipid monolayers with a preference for fluid layers. The interaction with a zwitterionic layer is almost absent for the linear derivative but measurable for the cyclic arenicin Ar-1. This is in accordance with biological experiments showing that Ar-1 forms well defined stable pores in phospholipid and lipopolysaccharide (LPS) membranes (cytotoxicity). The synthetic linear arenicin, which is less cytotoxic, does not affect the mammalian lipids to such an extent. The interaction of arenicin with bacterial membrane lipids is dominated by hydrogen bonding together with electrostatic and hydrophobic interactions.
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      PubDate: 2017-09-23T16:27:19Z
      DOI: 10.1016/j.cis.2017.06.001
      Issue No: Vol. 247 (2017)
       
  • 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
      Pages: 543 - 554
      Abstract: Publication date: September 2017
      Source:Advances in Colloid and Interface Science, Volume 247
      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.
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      PubDate: 2017-09-23T16:27:19Z
      DOI: 10.1016/j.cis.2017.07.009
      Issue No: Vol. 247 (2017)
       
  • Surface modification using TEMPO and its derivatives
    • Authors: Megiel
      Abstract: Publication date: Available online 20 September 2017
      Source:Advances in Colloid and Interface Science
      Author(s): Elżbieta Megiel
      This article provides an overview of the methods for surface modification based on the use of stable radicals: 2,2,6,6-tetramethylpiperidine-1-oxyl (TEMPO) and its derivatives. Two approaches are discussed. The first relies on the immobilization of TEMPO moieties on the surface of various materials including silicon wafers, silica particles, organic polymers as well as diverse nanomaterials. Applications of such materials with spin labeled surface/interface, in (electro)catalysis, synthesis of novel hybrid nanostructures and nanocomposites as well as in designing of organic magnets and novel energy storage devices are also included in the discussion. The second approach utilizes TEMPO and its derivatives for the grafting of polymer chains and polymer brushes formation on flat and nanostructure surfaces via Nitroxide Mediated Radical Polymerization (NMRP). The influence of such polymer modification on surface/interface physicochemical properties is also presented.
      Graphical abstract image

      PubDate: 2017-09-23T16:27:19Z
       
  • Auxiliary soft beam for the amplification of the elasto-capillary coiling:
           Towards stretchable electronics
    • Authors: Paul Grandgeorge; Arnaud Antkowiak; Sébastien Neukirch
      Abstract: Publication date: Available online 18 September 2017
      Source:Advances in Colloid and Interface Science
      Author(s): Paul Grandgeorge, Arnaud Antkowiak, Sébastien Neukirch
      A flexible fiber carrying a liquid drop may coil inside the drop thereby creating a drop-on-fiber system with an ultra-extensible behavior. During compression, the excess fiber is spooled inside the droplet and capillary forces keep the system taut. During subsequent elongation, the fiber is gradually released and if a large number of spools is uncoiled a high stretchability is achieved. This mechanical behaviour is of interest for stretchable connectors but information, may it be electronic or photonic, usually travels through stiff functional materials. These high Young's moduli, leading to large bending rigidity, prevent in-drop coiling. Here we overcome this limitation by attaching a beam of soft elastomer to the functional fiber, thereby creating a composite system which exhibits in-drop coiling and carries information while being ultra-extensible. We present a simple model to explain the underlying mechanics of the addition of the soft beam and we show how it favors in-drop coiling. We illustrate the method with a two-centimeter long micronic PEDOT:PSS conductive fiber joined to a PVS soft beam, showing that the system conveys electricity throughout a 1900% elongation.
      Graphical abstract image

      PubDate: 2017-09-23T16:27:19Z
      DOI: 10.1016/j.cis.2017.08.011
       
  • ifc (ed board)
    • Abstract: Publication date: September 2017
      Source:Advances in Colloid and Interface Science, Volume 247


      PubDate: 2017-09-23T16:27:19Z
       
  • special contents
    • Abstract: Publication date: September 2017
      Source:Advances in Colloid and Interface Science, Volume 247


      PubDate: 2017-09-23T16:27:19Z
       
  • Electro-optic Kerr effect in the study of mixtures of oppositely charged
           colloids. The case of polymer-surfactant mixtures in aqueous solutions
    • Authors: Ritacco
      Abstract: Publication date: September 2017
      Source:Advances in Colloid and Interface Science, Volume 247
      Author(s): Hernán A. Ritacco
      In this review I highlight a very sensitive experimental technique for the study of polymer-surfactant complexation: The electro-optic Kerr effect. This review does not intend to be exhaustive in covering the Kerr Effect nor polymer-surfactant systems, instead it aims to call attention to an experimental technique that, even if applied in a qualitative manner, could give very rich and unique information about the structures and aggregation processes occurring in mixtures of oppositely charged colloids. The usefulness of electric birefringence experiments in the study of such systems is illustrated by selected results from literature in hope of stimulating the realization of more birefringence experiments on similar systems. This review is mainly aimed at, but not restricted to, researchers working in polyelectrolyte-surfactant mixtures in aqueous solutions, Kerr effect is a powerful experimental tool that could be used in the study of many systems in diverse areas of colloidal physics.
      Graphical abstract image

      PubDate: 2017-09-23T16:27:19Z
       
  • Surfactant films in lyotropic lamellar (and related) phases: Fluctuations
           and interactions
    • Authors: Nallet
      Abstract: Publication date: September 2017
      Source:Advances in Colloid and Interface Science, Volume 247
      Author(s): Frédéric Nallet
      The analogy between soap films thinning under border capillary suction and lamellar stacks of surfactant bilayers dehydrated by osmotic stress is explored, in particular in the highly dehydrated limit where the soap film becomes a Newton black film. The nature of short-range repulsive interactions between surfactant-covered interfaces and acting across water channels in both cases will be discussed.
      Graphical abstract image

      PubDate: 2017-09-23T16:27:19Z
       
  • Different approaches to study protein films at air/water interface
    • Abstract: Publication date: September 2017
      Source:Advances in Colloid and Interface Science, Volume 247
      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: 2017-09-23T16:27:19Z
       
  • On the extent of surface stagnation produced jointly by insoluble
           surfactant and thermocapillary flow
    • Authors: Andrey Shmyrov; Aleksey Mizev; Vitaly Demin; Mikhail Petukhov; Dmitry Bratsun
      Abstract: Publication date: Available online 15 September 2017
      Source:Advances in Colloid and Interface Science
      Author(s): Andrey Shmyrov, Aleksey Mizev, Vitaly Demin, Mikhail Petukhov, Dmitry Bratsun
      We consider the effect of a partially contaminated interface on the steady thermocapillary flow developed in a two-dimensional slot of finite extent. The contamination is due to the presence of an insoluble surfactant which is carried away by the flow and forms a region of stagnant surface. This problem, first studied in the classical theoretical paper by Carpenter and Homsy (1985, J. Fluid Mech. 155, 429), is revisited thanks to new experimental data. We show that there is a qualitative agreement between above theory and our experiments: two different regions simultaneously coexist on the surface, one of which is free from surfactant and subject to vigorous Marangoni flow, while the other is stagnant and subject to creeping flow with the surface velocity smaller about two orders of magnitude. We found, however, significant disagreement between theory predictions for the extent of a stagnant surface region and newly obtained experimental data. In this paper, we provide an explanation for this discrepancy demonstrating that the surface temperature distribution is far from suggested earlier. Another effect, not previously taken into account, is a possible phase transition experienced by the surfactant. We obtain a correct analytic solution for the position of the edge of the stagnation zone and compare it with the experimental data.
      Graphical abstract image

      PubDate: 2017-09-17T15:52:00Z
      DOI: 10.1016/j.cis.2017.08.010
       
  • Functional polymer materials affecting cell attachment
    • Authors: Bo Jiang; Jian Yang; Nahla Rahoui; Nadia Taloub; Yu Dong Huang
      Abstract: Publication date: Available online 14 September 2017
      Source:Advances in Colloid and Interface Science
      Author(s): Bo Jiang, Jian Yang, Nahla Rahoui, Nadia Taloub, Yu Dong Huang
      This review discusses the functional polymer materials effect on the cell adhesion. The applied polymer materials for the cell adhesion purpose was prepared based on organic fibers and biocompatible hydrogel. On the other hand, the active peptides are incorporated into the polymer materials substrate via the cysteine-containing peptides and N-hydroxysuccinimide-active group. Cancer cells and normal cells were presented for the selective adhesion via the introduced polymer materials substrate containing active peptides including Arginine–Glycine-Aspartic and Isoleucine-Lysine–Valine-Alanine–Valine sequence peptides. This selectivity is revealed by a significant cooperativity between specific and non-specific cell adhesion. This study is of a great impact for the design of the polymeric structures for cell attachment.
      Graphical abstract image

      PubDate: 2017-09-17T15:52:00Z
      DOI: 10.1016/j.cis.2017.09.002
       
  • Transport velocity of droplets on ratchet conveyors
    • Authors: Hal R. Holmes; Karl F. Böhringer
      Abstract: Publication date: Available online 14 September 2017
      Source:Advances in Colloid and Interface Science
      Author(s): Hal R. Holmes, Karl F. Böhringer
      Anisotropic ratchet conveyors (ARC) are a type of digital microfluidic system. Unlike electrowetting based systems, ARCs transport droplets through a passive, micro-patterned surface and applied orthogonal vibrations. The mechanics of droplet transport on ARC devices has yet to be as well characterized and understood as on electrowetting systems. In this work, we investigate how the design of the ARC substrate affects the droplet response to vibrations and perform the first characterization of transport velocity on ARC devices. We discovered that the design of the ARC device has a significant effect on both the transport efficiency and velocity of actuated droplets, and that the amplitude of the applied vibration can modulate the velocity of transported droplets. Finally, we show that the movement of droplet edges is not continuous but rather the sum of quantized steps between features of the ARC device. These results provide new insights into the behavior of droplets vibrated on asymmetric surface patterns and will serve as the foundation for the design and development of future lab-on-a-chip systems.
      Graphical abstract image

      PubDate: 2017-09-17T15:52:00Z
      DOI: 10.1016/j.cis.2017.08.009
       
  • Functionalization of single solid state nanopores to mimic biological ion
           channels: A review
    • Authors: Mathilde Lepoitevin; Tianji Ma; Mikhael Bechelany; Jean-Marc-Janot; Sebastien Balme
      Abstract: Publication date: Available online 14 September 2017
      Source:Advances in Colloid and Interface Science
      Author(s): Mathilde Lepoitevin, Tianji Ma, Mikhael Bechelany, Jean-Marc-Janot, Sebastien Balme
      In nature, ion channels are highly selective pores and act as gate to ensure selective ion transport, allowing ions to cross the membrane. By mimicking them, single solid state nanopore devices emerge as a new, powerful class of molecule sensors that allow for the label-free detection of biomolecules (DNA, RNA, and proteins), non-biological polymers, as well as small molecules. In this review, we exhaustively describe the fabrication and functionalization techniques to design highly robust and selective solid state nanopores. First we outline the different materials and methods to design nanopores, we explain the ionic conduction in nanopores, and finally we summarize some techniques to modify and functionalize the surface in order to obtain biomimetic nanopores, responding to different external stimuli.
      Graphical abstract image

      PubDate: 2017-09-17T15:52:00Z
      DOI: 10.1016/j.cis.2017.09.001
       
  • A critical review on the prospect of polyaniline-grafted biodegradable
           nanocomposite
    • Authors: Mohammad Shahadat; Mohammad Zain Khan; Parveen Fatimah Rupani; Asha Embrandiri; Saima Sultana; Z.A. Shaikh; S. Wazed Ali; T.R. Sreekrishnan
      Abstract: Publication date: Available online 6 September 2017
      Source:Advances in Colloid and Interface Science
      Author(s): Mohammad Shahadat, Mohammad Zain Khan, Parveen Fatimah Rupani, Asha Embrandiri, Saima Sultana, Z.A. Shaikh, S. Wazed Ali, T.R. Sreekrishnan
      Among the various electrically conducting polymers, polyaniline (PANI) has gained attentions due to its unique properties and doping chemistry. A number of electrically conducting biodegradable polymers has been synthesized by incorporating a biodegradable content of cellulose, chitin, chitosan, etc. in the matrix of PANI. The hybrid materials are also employed as photocatalysts, antibacterial agents, sensors, fuel cells and as materials in biomedical applications. Furthermore, these biodegradable and biocompatible conducting polymers are employed in tissue engineering, dental implants and targeted drug delivery. This review presents state of the art of PANI based biodegradable polymers along with their synthesis routes and unique applications in diverse fields. In future, the synthesis of PANI-grafted biodegradable nanocomposite material is expected to open innovative ways for their outstanding applications.
      Graphical abstract image

      PubDate: 2017-09-09T15:28:50Z
      DOI: 10.1016/j.cis.2017.08.006
       
  • A fast and accurate Langmuir-type polymer microtensiometer
    • Authors: Pieter Gijsenbergh; Jan Vermant; Robert Puers
      Abstract: Publication date: Available online 5 September 2017
      Source:Advances in Colloid and Interface Science
      Author(s): Pieter Gijsenbergh, Jan Vermant, Robert Puers
      A semi-flexible polymer microtensiometer for local surface pressure measurements of Langmuir monolayers is presented. The current device geometry and read-out method via image analysis result in a theoretical accuracy of ±0.02 mN⋅m −1 for a dynamic range between 0 and 75 mN⋅m −1. The tensiometer sensitivity and dynamic range are easily tunable as they are solely based on the tensiometer spring dimensions. Finite element simulations are used to determine the response time of 20 ms for a subphase viscosity of 1 mPa⋅s. A poroviscomechanical model of the sensor is composed and the subphase viscosity is shown to dominate the transient behaviour. The tensiometer performance is verified in a Langmuir trough by applying rapid local surface pressure oscillations. A Wilhelmy plate is used as an independent measurement tool and the results of both techniques correlate well.
      Graphical abstract image

      PubDate: 2017-09-05T17:42:22Z
      DOI: 10.1016/j.cis.2017.08.007
       
  • Dominique Langevin Festschrift: Four decades opening gates in Colloid and
           Interface Science
    • Abstract: Publication date: Available online 5 August 2017
      Source:Advances in Colloid and Interface Science


      PubDate: 2017-08-25T16:58:47Z
       
  • 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.
      Graphical abstract image

      PubDate: 2017-08-02T11:43:44Z
      DOI: 10.1016/j.cis.2017.07.027
       
  • 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.
      Graphical abstract image

      PubDate: 2017-08-02T11:43:44Z
      DOI: 10.1016/j.cis.2017.07.017
       
  • 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.
      Graphical abstract image

      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).
      Graphical abstract image

      PubDate: 2017-07-23T04:22:51Z
      DOI: 10.1016/j.cis.2017.07.018
       
  • 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
       
  • 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.
      Graphical abstract image

      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.
      Graphical abstract image

      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
       
 
 
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