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  Subjects -> CHEMISTRY (Total: 849 journals)
    - ANALYTICAL CHEMISTRY (50 journals)
    - CHEMISTRY (598 journals)
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CHEMISTRY (598 journals)                  1 2 3 | Last

Showing 1 - 200 of 735 Journals sorted alphabetically
2D Materials     Hybrid Journal   (Followers: 8)
Accreditation and Quality Assurance: Journal for Quality, Comparability and Reliability in Chemical Measurement     Hybrid Journal   (Followers: 26)
ACS Catalysis     Full-text available via subscription   (Followers: 32)
ACS Chemical Neuroscience     Full-text available via subscription   (Followers: 17)
ACS Combinatorial Science     Full-text available via subscription   (Followers: 23)
ACS Macro Letters     Full-text available via subscription   (Followers: 23)
ACS Medicinal Chemistry Letters     Full-text available via subscription   (Followers: 39)
ACS Nano     Full-text available via subscription   (Followers: 226)
ACS Photonics     Full-text available via subscription   (Followers: 11)
ACS Synthetic Biology     Full-text available via subscription   (Followers: 21)
Acta Chemica Iasi     Open Access   (Followers: 2)
Acta Chimica Sinica     Full-text available via subscription   (Followers: 1)
Acta Chimica Slovaca     Open Access   (Followers: 1)
Acta Chromatographica     Full-text available via subscription   (Followers: 9)
Acta Facultatis Medicae Naissensis     Open Access  
Acta Metallurgica Sinica (English Letters)     Hybrid Journal   (Followers: 5)
Acta Scientifica Naturalis     Open Access   (Followers: 2)
adhäsion KLEBEN & DICHTEN     Hybrid Journal   (Followers: 5)
Adhesion Adhesives & Sealants     Hybrid Journal   (Followers: 7)
Adsorption Science & Technology     Full-text available via subscription   (Followers: 5)
Advanced Functional Materials     Hybrid Journal   (Followers: 50)
Advanced Science Focus     Free   (Followers: 3)
Advances in Chemical Engineering and Science     Open Access   (Followers: 53)
Advances in Chemical Science     Open Access   (Followers: 13)
Advances in Chemistry     Open Access   (Followers: 14)
Advances in Colloid and Interface Science     Full-text available via subscription   (Followers: 18)
Advances in Drug Research     Full-text available via subscription   (Followers: 22)
Advances in Enzyme Research     Open Access   (Followers: 9)
Advances in Fluorine Science     Full-text available via subscription   (Followers: 8)
Advances in Fuel Cells     Full-text available via subscription   (Followers: 15)
Advances in Heterocyclic Chemistry     Full-text available via subscription   (Followers: 8)
Advances in Materials Physics and Chemistry     Open Access   (Followers: 19)
Advances in Nanoparticles     Open Access   (Followers: 14)
Advances in Organometallic Chemistry     Full-text available via subscription   (Followers: 15)
Advances in Polymer Science     Hybrid Journal   (Followers: 41)
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)
Advances in Quantum Chemistry     Full-text available via subscription   (Followers: 5)
Advances in Science and Technology     Full-text available via subscription   (Followers: 12)
African Journal of Bacteriology Research     Open Access  
African Journal of Chemical Education     Open Access   (Followers: 2)
African Journal of Pure and Applied Chemistry     Open Access   (Followers: 7)
Agrokémia és Talajtan     Full-text available via subscription   (Followers: 2)
Alkaloids: Chemical and Biological Perspectives     Full-text available via subscription   (Followers: 3)
AMB Express     Open Access   (Followers: 1)
Ambix     Hybrid Journal   (Followers: 3)
American Journal of Biochemistry and Biotechnology     Open Access   (Followers: 67)
American Journal of Biochemistry and Molecular Biology     Open Access   (Followers: 14)
American Journal of Chemistry     Open Access   (Followers: 26)
American Journal of Plant Physiology     Open Access   (Followers: 13)
American Mineralogist     Hybrid Journal   (Followers: 13)
Analyst     Full-text available via subscription   (Followers: 38)
Angewandte Chemie     Hybrid Journal   (Followers: 159)
Angewandte Chemie International Edition     Hybrid Journal   (Followers: 210)
Annales UMCS, Chemia     Open Access   (Followers: 1)
Annals of Clinical Chemistry and Laboratory Medicine     Open Access   (Followers: 1)
Annual Reports in Computational Chemistry     Full-text available via subscription   (Followers: 3)
Annual Reports Section A (Inorganic Chemistry)     Full-text available via subscription   (Followers: 3)
Annual Reports Section B (Organic Chemistry)     Full-text available via subscription   (Followers: 8)
Annual Review of Chemical and Biomolecular Engineering     Full-text available via subscription   (Followers: 12)
Annual Review of Food Science and Technology     Full-text available via subscription   (Followers: 14)
Anti-Infective Agents     Hybrid Journal   (Followers: 3)
Antiviral Chemistry and Chemotherapy     Hybrid Journal  
Applied Organometallic Chemistry     Hybrid Journal   (Followers: 7)
Applied Spectroscopy     Full-text available via subscription   (Followers: 23)
Applied Surface Science     Hybrid Journal   (Followers: 28)
Arabian Journal of Chemistry     Open Access   (Followers: 6)
ARKIVOC     Open Access   (Followers: 2)
Asian Journal of Biochemistry     Open Access   (Followers: 1)
Atomization and Sprays     Full-text available via subscription   (Followers: 3)
Australian Journal of Chemistry     Hybrid Journal   (Followers: 7)
Autophagy     Hybrid Journal   (Followers: 2)
Avances en Quimica     Open Access   (Followers: 1)
Biochemical Pharmacology     Hybrid Journal   (Followers: 10)
Biochemistry     Full-text available via subscription   (Followers: 282)
Biochemistry Insights     Open Access   (Followers: 5)
Biochemistry Research International     Open Access   (Followers: 6)
BioChip Journal     Hybrid Journal  
Bioinorganic Chemistry and Applications     Open Access   (Followers: 9)
Bioinspired Materials     Open Access   (Followers: 5)
Biointerface Research in Applied Chemistry     Open Access   (Followers: 2)
Biointerphases     Open Access   (Followers: 1)
Biology, Medicine, & Natural Product Chemistry     Open Access   (Followers: 1)
Biomacromolecules     Full-text available via subscription   (Followers: 19)
Biomass Conversion and Biorefinery     Partially Free   (Followers: 10)
Biomedical Chromatography     Hybrid Journal   (Followers: 6)
Biomolecular NMR Assignments     Hybrid Journal   (Followers: 3)
BioNanoScience     Partially Free   (Followers: 4)
Bioorganic & Medicinal Chemistry     Hybrid Journal   (Followers: 108)
Bioorganic & Medicinal Chemistry Letters     Hybrid Journal   (Followers: 93)
Bioorganic Chemistry     Hybrid Journal   (Followers: 10)
Biopolymers     Hybrid Journal   (Followers: 18)
Biosensors     Open Access   (Followers: 2)
Biotechnic and Histochemistry     Hybrid Journal   (Followers: 1)
Bitácora Digital     Open Access  
Boletin de la Sociedad Chilena de Quimica     Open Access  
Bulletin of the Chemical Society of Ethiopia     Open Access   (Followers: 2)
Bulletin of the Chemical Society of Japan     Full-text available via subscription   (Followers: 24)
Bulletin of the Korean Chemical Society     Hybrid Journal   (Followers: 1)
C - Journal of Carbon Research     Open Access   (Followers: 3)
Cakra Kimia (Indonesian E-Journal of Applied Chemistry)     Open Access  
Canadian Association of Radiologists Journal     Full-text available via subscription   (Followers: 2)
Canadian Journal of Chemistry     Hybrid Journal   (Followers: 10)
Canadian Mineralogist     Full-text available via subscription   (Followers: 3)
Carbohydrate Research     Hybrid Journal   (Followers: 26)
Carbon     Hybrid Journal   (Followers: 67)
Catalysis for Sustainable Energy     Open Access   (Followers: 6)
Catalysis Reviews: Science and Engineering     Hybrid Journal   (Followers: 8)
Catalysis Science and Technology     Free   (Followers: 6)
Catalysis Surveys from Asia     Hybrid Journal   (Followers: 3)
Catalysts     Open Access   (Followers: 7)
Cellulose     Hybrid Journal   (Followers: 7)
Cereal Chemistry     Full-text available via subscription   (Followers: 4)
ChemBioEng Reviews     Full-text available via subscription   (Followers: 1)
ChemCatChem     Hybrid Journal   (Followers: 8)
Chemical and Engineering News     Free   (Followers: 12)
Chemical Bulletin of Kazakh National University     Open Access  
Chemical Communications     Full-text available via subscription   (Followers: 70)
Chemical Engineering Research and Design     Hybrid Journal   (Followers: 23)
Chemical Research in Chinese Universities     Hybrid Journal   (Followers: 3)
Chemical Research in Toxicology     Full-text available via subscription   (Followers: 19)
Chemical Reviews     Full-text available via subscription   (Followers: 173)
Chemical Science     Open Access   (Followers: 21)
Chemical Technology     Open Access   (Followers: 16)
Chemical Vapor Deposition     Hybrid Journal   (Followers: 5)
Chemical Week     Full-text available via subscription   (Followers: 8)
Chemie in Unserer Zeit     Hybrid Journal   (Followers: 55)
Chemie-Ingenieur-Technik (Cit)     Hybrid Journal   (Followers: 25)
ChemInform     Hybrid Journal   (Followers: 8)
Chemistry & Biodiversity     Hybrid Journal   (Followers: 6)
Chemistry & Biology     Full-text available via subscription   (Followers: 30)
Chemistry & Industry     Hybrid Journal   (Followers: 5)
Chemistry - A European Journal     Hybrid Journal   (Followers: 147)
Chemistry - An Asian Journal     Hybrid Journal   (Followers: 15)
Chemistry and Materials Research     Open Access   (Followers: 18)
Chemistry Central Journal     Open Access   (Followers: 4)
Chemistry Education Research and Practice     Free   (Followers: 5)
Chemistry in Education     Open Access   (Followers: 9)
Chemistry International     Hybrid Journal   (Followers: 2)
Chemistry Letters     Full-text available via subscription   (Followers: 45)
Chemistry of Materials     Full-text available via subscription   (Followers: 250)
Chemistry of Natural Compounds     Hybrid Journal   (Followers: 9)
Chemistry World     Full-text available via subscription   (Followers: 22)
Chemistry-Didactics-Ecology-Metrology     Open Access  
ChemistryOpen     Open Access   (Followers: 2)
Chemkon - Chemie Konkret, Forum Fuer Unterricht Und Didaktik     Hybrid Journal  
Chemoecology     Hybrid Journal   (Followers: 2)
Chemometrics and Intelligent Laboratory Systems     Hybrid Journal   (Followers: 15)
Chemosensors     Open Access  
ChemPhysChem     Hybrid Journal   (Followers: 9)
ChemPlusChem     Hybrid Journal   (Followers: 2)
ChemTexts     Hybrid Journal  
CHIMIA International Journal for Chemistry     Full-text available via subscription   (Followers: 2)
Chinese Journal of Chemistry     Hybrid Journal   (Followers: 6)
Chinese Journal of Polymer Science     Hybrid Journal   (Followers: 10)
Chromatographia     Hybrid Journal   (Followers: 24)
Chromatography Research International     Open Access   (Followers: 7)
Clay Minerals     Full-text available via subscription   (Followers: 9)
Cogent Chemistry     Open Access  
Colloid and Interface Science Communications     Open Access  
Colloid and Polymer Science     Hybrid Journal   (Followers: 10)
Colloids and Surfaces B: Biointerfaces     Hybrid Journal   (Followers: 8)
Combinatorial Chemistry & High Throughput Screening     Hybrid Journal   (Followers: 3)
Combustion Science and Technology     Hybrid Journal   (Followers: 18)
Comments on Inorganic Chemistry: A Journal of Critical Discussion of the Current Literature     Hybrid Journal   (Followers: 2)
Composite Interfaces     Hybrid Journal   (Followers: 6)
Comprehensive Chemical Kinetics     Full-text available via subscription   (Followers: 2)
Comptes Rendus Chimie     Full-text available via subscription  
Comptes Rendus Physique     Full-text available via subscription   (Followers: 1)
Computational and Theoretical Chemistry     Hybrid Journal   (Followers: 9)
Computational Biology and Chemistry     Hybrid Journal   (Followers: 12)
Computational Chemistry     Open Access   (Followers: 2)
Computers & Chemical Engineering     Hybrid Journal   (Followers: 9)
Coordination Chemistry Reviews     Full-text available via subscription   (Followers: 2)
Copernican Letters     Open Access  
Critical Reviews in Biochemistry and Molecular Biology     Hybrid Journal   (Followers: 5)
Crystal Structure Theory and Applications     Open Access   (Followers: 3)
CrystEngComm     Full-text available via subscription   (Followers: 11)
Current Catalysis     Hybrid Journal   (Followers: 2)
Current Metabolomics     Hybrid Journal   (Followers: 5)
Current Opinion in Colloid & Interface Science     Hybrid Journal   (Followers: 9)
Current Research in Chemistry     Open Access   (Followers: 8)
Current Science     Open Access   (Followers: 57)
Dalton Transactions     Full-text available via subscription   (Followers: 19)
Detection     Open Access   (Followers: 2)
Developments in Geochemistry     Full-text available via subscription   (Followers: 2)
Diamond and Related Materials     Hybrid Journal   (Followers: 12)
Dislocations in Solids     Full-text available via subscription  
Doklady Chemistry     Hybrid Journal  
Drying Technology: An International Journal     Hybrid Journal   (Followers: 4)
Eclética Química     Open Access   (Followers: 1)
Ecological Chemistry and Engineering S     Open Access   (Followers: 4)
Ecotoxicology and Environmental Contamination     Open Access  
Educación Química     Open Access   (Followers: 1)
Education for Chemical Engineers     Hybrid Journal   (Followers: 5)
EJNMMI Radiopharmacy and Chemistry     Open Access  
Elements     Full-text available via subscription   (Followers: 2)
Environmental Chemistry     Hybrid Journal   (Followers: 9)
Environmental Chemistry Letters     Hybrid Journal   (Followers: 4)
Environmental Science & Technology Letters     Full-text available via subscription   (Followers: 5)

        1 2 3 | Last

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  [3042 journals]
  • On the cohesion of fluids and their adhesion to solids: Young's equation
           at the atomic scale
    • Authors: J.-C. Fernandez-Toledano; T.D. Blake; P. Lambert; J. De Coninck
      Pages: 102 - 107
      Abstract: Publication date: July 2017
      Source:Advances in Colloid and Interface Science, Volume 245
      Author(s): J.-C. Fernandez-Toledano, T.D. Blake, P. Lambert, J. De Coninck
      Using large-scale molecular dynamics simulations, we model a 9.2nm liquid bridge between two solid plates having a regular hexagonal lattice and analyse the forces acting at the various interfaces for a range of liquid-solid interactions. Our objective is to study the mechanical equilibrium of the system, especially that at the three-phase contact line. We confirm previous MD studies that have shown that the internal pressure inside the liquid is given precisely by the Laplace contribution and that the solid exerts a global force at the contact line in agreement with Young's equation, validating it down to the nanometre scale, which we quantify. In addition, we confirm that the force exerted by the liquid on the solid has the expected normal component equal to γ lv sin θ 0, where γ lv is the surface tension of the liquid and θ 0 is the equilibrium contact angle measured on the scale of the meniscus. Recent thermodynamic arguments predict that the tangential force exerted by the liquid on the solid should be equal to the work of adhesion expressed as Wa 0 = γ lv (1+cos θ 0). However, we find that this is true only when any layering of the liquid molecules close to liquid-solid interface is negligible. The force significantly exceeds this value when strong layering is present.
      Graphical abstract image

      PubDate: 2017-06-15T01:39:24Z
      DOI: 10.1016/j.cis.2017.03.006
      Issue No: Vol. 245 (2017)
       
  • Surface properties of magnetite in high temperature aqueous electrolyte
           solutions: A review
    • Authors: Sonja M. Vidojkovic; Marko P. Rakin
      Pages: 108 - 129
      Abstract: Publication date: July 2017
      Source:Advances in Colloid and Interface Science, Volume 245
      Author(s): Sonja M. Vidojkovic, Marko P. Rakin
      Deposits and scales formed on heat transfer surfaces in power plant water/steam circuits have a significant negative impact on plant reliability, availability and performance, causing tremendous economic consequences and subsequent increases in electricity cost. Consequently, the improvement of the understanding of deposition mechanisms on power generating surfaces is defined as a high priority in the power industry. The deposits consist principally of iron oxides, which are steel corrosion products and usually present in colloidal form. Magnetite (Fe3O4) is the predominant and most abundant compound found in water/steam cycles of all types of power plants. The crucial factor that governs the deposition process and influences the deposition rate of magnetite is the electrostatic interaction between the metal wall surfaces and the suspended colloidal particles. However, there is scarcity of data on magnetite surface properties at elevated temperatures due to difficulties in their experimental measurement. In this paper a generalized overview of existing experimental data on surface characteristics of magnetite at high temperatures is presented with particular emphasis on possible application in the power industry. A thorough analysis of experimental techniques, mathematical models and results has been performed and directions for future investigations have been considered. The state-of-the-art assessment showed that for the characterization of magnetite/aqueous electrolyte solution interface at high temperatures acid-base potentiometric titrations and electrophoresis were the most beneficial and dependable techniques which yielded results up to 290 and 200°C, respectively. Mass titrations provided data on magnetite surface charge up to 320°C, however, this technique is highly sensitive to the minor concentrations of impurities present on the surface of particle. Generally, fairly good correlation between the isoelectric point (pHiep) and point of zero charge (pHpzc) values has been obtained. All obtained results showed that the surface of magnetite particles is negatively charged in typical high temperature thermal power plant water, which indicates the low probability of aggregation and deposition on plant metal surfaces. The results also gave strong evidence on decline of pHiep and pHpzc with temperature in the same manner as neutral pH of water. The thermodynamic parameters of magnetite surface protonation reactions were in good agreement with each other and obtained using one site/two pK and mainly one site/one pK model. All collected data provided evidences for interaction between particles, probability of deposition and eventual attachment to the steel surface at various pH and temperatures and can serve as a foundation for future surface studies aimed at optimizing plant performances and reducing of magnetite deposition. In future works it would be indispensable to provide the surface experimental data for extended temperature ranges, typical solution chemistries and metal surfaces of power plant structural components and thus obtain entire set of results useful in modeling the surface behavior and control of deposition process in power reactors and thermal plant circuits. Moreover, the acquired results will be applicable and greatly valuable to all other types of power plants, industrial facilities and technological processes using the high temperature water medium.
      Graphical abstract image

      PubDate: 2017-06-15T01:39:24Z
      DOI: 10.1016/j.cis.2016.08.008
      Issue No: Vol. 245 (2017)
       
  • Eli Ruckenstein – A Rare Researcher, Teacher, and Mentor par
           Excellence
    • Authors: Yun Hang Hu; Ramanathan Nagarajan; Paschalis Alexandridis
      Pages: 1 - 5
      Abstract: Publication date: June 2017
      Source:Advances in Colloid and Interface Science, Volume 244
      Author(s): Yun Hang Hu, Ramanathan Nagarajan, Paschalis Alexandridis


      PubDate: 2017-06-29T03:08:17Z
      DOI: 10.1016/j.cis.2017.05.017
      Issue No: Vol. 244 (2017)
       
  • Redox-electrodes for selective electrochemical separations
    • Authors: Xiao Su; T. Alan Hatton
      Pages: 6 - 20
      Abstract: Publication date: June 2017
      Source:Advances in Colloid and Interface Science, Volume 244
      Author(s): Xiao Su, T. Alan Hatton
      Redox-active materials hold great promise as platforms for selective liquid-phase separations. In contrast to capacitive electrodes that rely purely on double-layer charge for deionization, redox-modified electrodes can be used to control Faradaic reactions at the interface to selectively bind various charged and uncharged molecules, thus modulating surface interactions through electrochemical potential solely. These electrodes can be composed of a range of functional materials, from organic and organometallic polymers to inorganic crystalline compounds, each relying on its own distinct ion-exchange process. Often, redox electrochemical systems can serve as pseudocapacitors or batteries, thus offering an advantageous combination of adsorption selectivity and energy storage/recovery. This review summarizes redox-interfaces for electrosorption and release, outlines methods for preparation and synthesis, discusses the diverse mechanisms for interaction, and gives a perspective on the future of redox-mediated separations.
      Graphical abstract image

      PubDate: 2017-06-29T03:08:17Z
      DOI: 10.1016/j.cis.2016.09.001
      Issue No: Vol. 244 (2017)
       
  • Formation of Charge Carriers in Liquids
    • Authors: Dennis C. Prieve; Benjamin A. Yezer; Aditya S. Khair; Paul J. Sides; James W. Schneider
      Pages: 21 - 35
      Abstract: Publication date: June 2017
      Source:Advances in Colloid and Interface Science, Volume 244
      Author(s): Dennis C. Prieve, Benjamin A. Yezer, Aditya S. Khair, Paul J. Sides, James W. Schneider
      After presenting a brief historical overview of the classic contributions of Faraday, Arrhenius, Kohlrausch, Bjerrum, Debye, Hückel and Onsager to understanding the conductivity of true electrolytes in aqueous solutions, we present an in-depth review of the 1933 work of Fuoss & Kraus who explored the effect of the solvent on electrolyte dissociation equilibria in either polar or nonpolar media. Their theory predicts that the equilibrium constant for dissociation decays exponentially with the ratio of the Bjerrum length λ B to the ion-pair size a. Fuoss & Kraus experimentally confirmed the dependence on λ B of the solvent, while more recent experiments explored the dependence on a. We also present an in-depth review of the charge-fluctuation theory used to explain the sharp increase in conductivity with added water for water-in-oil microemulsions stabilized by ionic surfactants. Water swells the droplets making a greater fraction of them charged. At least for low-water content, the same exponential dependence on λ B /a is predicted, provided a is chosen as the size of the polar core of the droplet or inverted micelle. Potential electrolytes like alcohols acquire charge by exchanging a proton. The dissociation equilibrium of the resulting ion-pair in mixtures of toluene and alcohol appears to be well modelled by the Fuoss theory. Solutions of inverted micelles are also thought to acquire charge by exchanging a small ion between two net-neutral micelles. Except for the dissociation of true electrolytes, all of the charging scenarios described above can be represented by a two-reaction sequence: 1) the disproportionation of charge between two neutral molecules, inverted micelles or droplets; followed by 2) the dissociation of the “ion”-pair intermediates. (The dissociation of true electrolytes involves only the second.) For each of the above charging theories, the extent of the second reaction decays exponentially with λ B /a.
      Graphical abstract image

      PubDate: 2017-06-29T03:08:17Z
      DOI: 10.1016/j.cis.2016.11.004
      Issue No: Vol. 244 (2017)
       
  • Understanding the colloidal dispersion stability of 1D and 2D materials:
           Perspectives from molecular simulations and theoretical modeling
    • Authors: Shangchao Lin; Chih-Jen Shih; Vishnu Sresht; Ananth Govind Rajan; Michael S. Strano; Daniel Blankschtein
      Pages: 36 - 53
      Abstract: Publication date: June 2017
      Source:Advances in Colloid and Interface Science, Volume 244
      Author(s): Shangchao Lin, Chih-Jen Shih, Vishnu Sresht, Ananth Govind Rajan, Michael S. Strano, Daniel Blankschtein
      The colloidal dispersion stability of 1D and 2D materials in the liquid phase is critical for scalable nano-manufacturing, chemical modification, composites production, and deployment as conductive inks or nanofluids. Here, we review recent computational and theoretical studies carried out by our group to model the dispersion stability of 1D and 2D materials, including single-walled carbon nanotubes, graphene, and graphene oxide in aqueous surfactant solutions or organic solvents. All-atomistic (AA) molecular dynamics (MD) simulations can probe the molecular level details of the adsorption morphology of surfactants and solvents around these materials, as well as quantify the interaction energy between the nanomaterials mediated by surfactants or solvents. Utilizing concepts from reaction kinetics and diffusion, one can directly predict the rate constants for the aggregation kinetics and dispersion life times using MD outputs. Furthermore, the use of coarse-grained (CG) MD simulations allows quantitative prediction of surfactant adsorption isotherms. Combined with the Poisson–Boltzmann equation, the Langmuir isotherm, and the DLVO theory, one can directly use CGMD outputs to: (i) predict electrostatic potentials around the nanomaterial, (ii) correlate surfactant surface coverages with surfactant concentrations in the bulk dispersion medium, and (iii) determine energy barriers against coagulation. Finally, we discuss challenges associated with studying emerging 2D materials, such as, hexagonal boron nitride (h-BN), phosphorene, and transition metal dichalcogenides (TMDCs), including molybdenum disulfide (MoS2). An outlook is provided to address these challenges with plans to develop force-field parameters for MD simulations to enable predictive modeling of emerging 2D materials in the liquid phase.

      PubDate: 2017-06-29T03:08:17Z
      DOI: 10.1016/j.cis.2016.07.007
      Issue No: Vol. 244 (2017)
       
  • Ionic liquid and nanoparticle hybrid systems: Emerging applications
    • Authors: Zhiqi He; Paschalis Alexandridis
      Pages: 54 - 70
      Abstract: Publication date: June 2017
      Source:Advances in Colloid and Interface Science, Volume 244
      Author(s): Zhiqi He, Paschalis Alexandridis
      Having novel electronic and optical properties that emanate from their nano-scale dimensions, nanoparticles are central to numerous applications. Ionic liquids can confer to nanoparticle chemical protection and physicochemical property enhancement through intermolecular interactions and can consequently improve the stability and reusability of nanoparticle for various operations. With an aim to combine the novel properties of nanoparticles and ionic liquids, different structures have been generated, based on a balance of several intermolecular interactions. Such ionic liquid and nanoparticle hybrids are showing great potential in diverse applications. In this review, we first introduce various types of ionic liquid and nanoparticle hybrids, including nanoparticle colloidal dispersions in ionic liquids, ionic liquid-grafted nanoparticles, and nanoparticle-stabilized ionic liquid-based emulsions. Such hybrid materials exhibit interesting synergisms. We then highlight representative applications of ionic liquid and nanoparticle hybrids in the catalysis, electrochemistry and separations fields. Such hybrids can attain better stability and higher efficiency under a broad range of conditions. Novel and enhanced performance can be achieved in these applications by combining desired properties of ionic liquids and of nanoparticles within an appropriate hybrid nanostructure.
      Graphical abstract image

      PubDate: 2017-06-29T03:08:17Z
      DOI: 10.1016/j.cis.2016.08.004
      Issue No: Vol. 244 (2017)
       
  • From polyelectrolyte complexes to polyelectrolyte multilayers:
           Electrostatic assembly, nanostructure, dynamics, and functional properties
           
    • Authors: Biswa P. Das; Marina Tsianou
      Pages: 71 - 89
      Abstract: Publication date: June 2017
      Source:Advances in Colloid and Interface Science, Volume 244
      Author(s): Biswa P. Das, Marina Tsianou
      Polyelectrolyte complexes (PECs) are three-dimensional macromolecular structures formed by association of oppositely charged polyelectrolytes in solution. Polyelectrolyte multilayers (PEMs) can be considered a special case of PECs prepared by layer-by-layer (LbL) assembly that involves sequential deposition of molecular-thick polyelectrolyte layers with nanoscale control over the size, shape, composition and internal organization. Although many functional PEMs with novel physical and chemical characteristics have been developed, the current practical applications of PEMs are limited to those that require only a few bilayers and are relatively easy to prepare. The viability of such engineered materials can be realized only after overcoming the scientific and engineering challenges of understanding the kinetics and transport phenomena involved in the multilayer growth and the factors governing their final structure, composition, and response to external stimuli. There is a great need to model PEMs and to connect PEM behavior with the characteristics of the PEC counterparts to allow for prediction of performance and better design of multilayered materials. This review focuses on the relationship between PEMs and PECs. The constitutive interactions, the thermodynamics and kinetics of polyelectrolyte complexation and PEM formation, PEC phase behavior, PEM growth, the internal structure and stability in PEMs and PECs, and their response to external stimuli are presented. Knowledge of such interactions and behavior can guide rapid fabrication of PEMs and can aid their applications as nanocomposites, coatings, nano-sized reactors, capsules, drug delivery systems, and in electrochemical and sensing devices. The challenges and opportunities in future research directions are also discussed.
      Graphical abstract image

      PubDate: 2017-06-29T03:08:17Z
      DOI: 10.1016/j.cis.2016.12.004
      Issue No: Vol. 244 (2017)
       
  • On the surface tension and Zeta potential of electrolyte solutions
    • Authors: Marian Manciu; Felicia S. Manciu; Eli Ruckenstein
      Pages: 90 - 99
      Abstract: Publication date: June 2017
      Source:Advances in Colloid and Interface Science, Volume 244
      Author(s): Marian Manciu, Felicia S. Manciu, Eli Ruckenstein
      The distribution of ions in the vicinity of the air/water interface is still a matter of strong debate, with numerous calculations and experiments providing contradictory results, even regarding the preference of simple ions (such as H+ and OH−) for interfacial or bulk water. When short range interactions between ions and the interface are assumed independent of bulk concentrations, if they are compatible with the surface tension data, they underpredict the experimental Zeta potentials by orders of magnitude. If they are compatible with Zeta potential data, they are in strong disagreement with surface tension experiments. It is suggested that these observations might be a result of the relatively low number of interfacial water molecules available to hydrate the ions and the competition between various ions for adsorption sites. Therefore, whereas at low bulk concentrations, the Structure-Breaking ions prefer the interface, at sufficiently large bulk concentrations the surface adsorptions of these ions become saturated, and their interfacial concentrations may become lower than in the bulk. Consequently, the total interactions of ions with the interface can be strongly attractive at low bulk concentrations, and less attractive (or even repulsive), at high concentrations. To model this effect, the interactions between ions and interface are taken into account via modified Langmuir adsorption expressions for OH− and Cl−, while the H+ ions are considered to be attached to any interfacial water molecule, even if the latter participate in the hydration of anions. The simple model of adsorption employed here is in agreement with both experiments on Zeta potential and on surface tension, and might reveal the conditions under which a given ion exhibits propensity for either the air/water interface, or for bulk water.
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      PubDate: 2017-06-29T03:08:17Z
      DOI: 10.1016/j.cis.2016.06.006
      Issue No: Vol. 244 (2017)
       
  • Influence of alkane and perfluorocarbon vapors on adsorbed surface layers
           and spread insoluble monolayers of surfactants, proteins and lipids
    • Authors: V.B. Fainerman; E.V. Aksenenko; R. Miller
      Pages: 100 - 112
      Abstract: Publication date: June 2017
      Source:Advances in Colloid and Interface Science, Volume 244
      Author(s): V.B. Fainerman, E.V. Aksenenko, R. Miller
      The influence of hexane vapor in the air atmosphere on the surface tension of water and solutions of C10EO8, C n TAB and proteins are presented. For dry air, a fast and strong decrease of surface tension of water was observed. In humid air, the process is slower and the surface tension higher. There are differences between the results obtained by the maximum bubble pressure, pendant drop and emerging bubble methods, which are discussed in terms of depletion and initial surface load. The surface tension of aqueous solutions of β-сasein (BCS), β-lactoglobulin (BLG) and human serum albumin (HSA) at the interfaces with air and air-saturated hexane vapor were measured. The results indicate that the equilibrium surface tension in the hexane vapor atmosphere is considerably lower (at 13–20mN/m) as compared to the values at the interface with pure air. A reorientation model is proposed assuming several states of adsorbed molecules with different molar area values. The newly developed theoretical model is used to describe the effect of alkane vapor in the gas phase on the surface tension. This model assumes that the first layer is composed of surfactant (or protein) molecules mixed with alkane, and the second layer is formed by alkane molecules only. The processing of the experimental data for the equilibrium surface tension for the C10EO8 and BCS solutions results in a perfect agreement between the observed and calculated values. The co-adsorption mechanism of dipalmitoyl phosphatidyl choline (DPPC) and the fluorocarbon molecules leads to remarkable differences in the surface pressure term of cohesion Π coh. This in turn leads to a very efficient fluidization of the monolayer. It was found that the adsorption equilibrium constant for dioctanoyl phosphatidyl choline is increased in the presence of perfluorohexane, and the intermolecular interaction of the components is strong.
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      PubDate: 2017-06-29T03:08:17Z
      DOI: 10.1016/j.cis.2015.11.004
      Issue No: Vol. 244 (2017)
       
  • Constructing a molecular theory of self-assembly: Interplay of ideas from
           surfactants and block copolymers
    • Authors: Ramanathan Nagarajan
      Pages: 113 - 123
      Abstract: Publication date: June 2017
      Source:Advances in Colloid and Interface Science, Volume 244
      Author(s): Ramanathan Nagarajan
      Low molecular weight surfactants and high molecular weight block copolymers display analogous self-assembly behavior in solutions and at interfaces, generating nanoscale structures of different shapes. Understanding the link between the molecular structure of these amphiphiles and their self-assembly behavior has been the goal of theoretical studies. Despite the analogies between surfactants and block copolymers, models predicting their self-assembly behavior have evolved independent of one another, each overlooking the molecular feature considered critical to the other. In this review, we focus on the interplay of ideas pertaining to surfactants and block copolymers in three areas of self-assembly. First, we show how improved free energy models have evolved by applying ideas from surfactants to block copolymers and vice versa, giving rise to a unitary theoretical framework and better predictive capabilities for both classes of amphiphiles. Second we show that even though molecular packing arguments are often used to explain aggregate shape transitions resulting from self-assembly, the molecular packing considerations are more relevant in the case of surfactants whereas free energy criteria are relevant for block copolymers. Third, we show that even though the surfactant and block copolymer aggregates are small nanostructures, the size differences between them is significant enough to make the interfacial effects control the solubilization of molecules in surfactant micelles while the bulk interactions control the solubilization in block copolymer micelles. Finally, we conclude by identifying recent theoretical progress in adapting the micelle model to a wide variety of self-assembly phenomena and the challenges to modeling posed by emerging novel classes of amphiphiles with complex biological, inorganic or nanoparticle moieties.
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      PubDate: 2017-06-29T03:08:17Z
      DOI: 10.1016/j.cis.2016.12.001
      Issue No: Vol. 244 (2017)
       
  • On the influence of surfactant on the coarsening of aqueous foams
    • Authors: Zenaida Briceño-Ahumada; Dominique Langevin
      Pages: 124 - 131
      Abstract: Publication date: June 2017
      Source:Advances in Colloid and Interface Science, Volume 244
      Author(s): Zenaida Briceño-Ahumada, Dominique Langevin
      We review the coarsening process of foams made with various surfactants and gases, focusing on physico-chemical aspects. Several parameters strongly affect coarsening: foam liquid fraction and foam film permeability, this permeability depending on the surfactant used. Both parameters may evolve with time: the liquid fraction, due to gravity drainage, and the film permeability, due to the decrease of capillary pressure during bubble growth, and to the subsequent increase in film thickness. Bubble coalescence may enhance the bubble’s growth rate, in which case the bubble polydispersity increases. The differences found between the experiments reported in the literature and between experiments and theories are discussed.
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      PubDate: 2017-06-29T03:08:17Z
      DOI: 10.1016/j.cis.2015.11.005
      Issue No: Vol. 244 (2017)
       
  • Adsorption of poly(ethylene oxide)-containing amphiphilic polymers on
           solid-liquid interfaces: Fundamentals and applications
    • Authors: Andrew M. Bodratti; Biswajit Sarkar; Paschalis Alexandridis
      Pages: 132 - 163
      Abstract: Publication date: June 2017
      Source:Advances in Colloid and Interface Science, Volume 244
      Author(s): Andrew M. Bodratti, Biswajit Sarkar, Paschalis Alexandridis
      The adsorption of amphiphilic molecules of varying size on solid-liquid interfaces modulates the properties of colloidal systems. Nonionic, poly(ethylene oxide) (PEO)-based amphiphilic molecules are particularly useful because of their graded hydrophobic-hydrophilic nature, which allows for adsorption on a wide array of solid surfaces. Their adsorption also results in other useful properties, such as responsiveness to external stimuli and solubilization of hydrophobic compounds. This review focuses on the adsorption properties of PEO-based amphiphiles, beginning with a discussion of fundamental concepts pertaining to the adsorption of macromolecules on solid-liquid interfaces, and more specifically the adsorption of PEO homopolymers. The main portion of the review highlights studies on factors affecting the adsorption and surface self-assembly of PEO-PPO-PEO block copolymers, where PPO is poly(propylene oxide). Block copolymers of this type are commercially available and of interest in several fields, due to their low toxicity and compatibility in aqueous systems. Examples of applications relevant to the interfacial behavior of PEO-PPO-PEO block copolymers are paints and coatings, detergents, filtration, and drug delivery. The methods discussed herein for manipulating the adsorption properties of PEO-PPO-PEO are emphasized for their ability to shed light on molecular interactions at interfaces. Knowledge of these interactions guides the formulation of novel materials with useful mesoscale organization and micro- and macrophase properties.
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      PubDate: 2017-06-29T03:08:17Z
      DOI: 10.1016/j.cis.2016.09.003
      Issue No: Vol. 244 (2017)
       
  • Interfaces at equilibrium: A guide to fundamentals
    • Authors: Abraham Marmur
      Pages: 164 - 173
      Abstract: Publication date: June 2017
      Source:Advances in Colloid and Interface Science, Volume 244
      Author(s): Abraham Marmur
      The fundamentals of the thermodynamics of interfaces are reviewed and concisely presented. The discussion starts with a short review of the elements of bulk thermodynamics that are also relevant to interfaces. It continues with the interfacial thermodynamics of two-phase systems, including the definition of interfacial tension and adsorption. Finally, the interfacial thermodynamics of three-phase (wetting) systems is discussed, including the topic of non-wettable surfaces. A clear distinction is made between equilibrium conditions, in terms of minimizing energies (internal, Gibbs or Helmholtz), and equilibrium indicators, in terms of measurable, intrinsic properties (temperature, chemical potential, pressure). It is emphasized that the equilibrium indicators are the same whatever energy is minimized, if the boundary conditions are properly chosen. Also, to avoid a common confusion, a distinction is made between systems of constant volume and systems with drops of constant volume.
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      PubDate: 2017-06-29T03:08:17Z
      DOI: 10.1016/j.cis.2016.05.007
      Issue No: Vol. 244 (2017)
       
  • Oil lenses on the air–water surface and the validity of Neumann's
           rule
    • Authors: Alex Nikolov; Darsh Wasan
      Pages: 174 - 183
      Abstract: Publication date: June 2017
      Source:Advances in Colloid and Interface Science, Volume 244
      Author(s): Alex Nikolov, Darsh Wasan
      Many studies have focused on the mechanisms of oil spreading over the air–water surface, oil lens formation, and lens dynamics: Franklin et al.(1774), Rayleigh (1890), Neumann and Wangerin (1894), Hardy (1912), Lyons (1930), Langmuir (1933), Miller (1941), Zisman (1941), Pujado and Scriven (1972), Seeto et al. (1983), and Takamura et al. (2012). Despite all of these studies, the phenomenon of the oil lens's air–water surface equilibrium is still under discussion. Here, we highlight an accurate method to study the oil lens's three-phase-contact angle by reflected light interferometry, using both common (CRLI) and differential reflected light interferometry (DRLI) to verify Neumann's rule (the vectorial sum of the three tensions is zero). For non-spreading oils, the validity of Neumann's rule is confirmed for small lenses when the role of the oil film tension around the lens's meniscus is taken into consideration. Neumann's rule was also validated when the monolayer surface pressure isotherm was taken into consideration for oil spreading on the air–water surface. The periodic monolayer surface pressure oscillation of the oil phase monolayer created by the air–evaporating biphilic oil was monitored with time. The monolayer's surface pressure periodic oscillation was attributed to the instability of the aqueous film covering the oil drop phase. The knowledge gained from this study will benefit the fundamental understanding of the oil lens's air–water surface equilibrium and oil spill mechanisms, thereby promoting better methods for the prevention and clean-up of oil spills.
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      PubDate: 2017-06-29T03:08:17Z
      DOI: 10.1016/j.cis.2016.05.003
      Issue No: Vol. 244 (2017)
       
  • Nitrogen-containing polymers as a platform for CO2 electroreduction
    • Authors: Sathish Ponnurangam; Irina V. Chernyshova; Ponisseril Somasundaran
      Pages: 184 - 198
      Abstract: Publication date: June 2017
      Source:Advances in Colloid and Interface Science, Volume 244
      Author(s): Sathish Ponnurangam, Irina V. Chernyshova, Ponisseril Somasundaran
      Heterogeneous electroreduction of CO2 has received considerable attention in the past decade. However, none of the earlier reviews has been dedicated to nitrogen-containing polymers (N-polymers) as an emerging platform for conversion of CO2 to industrially useful chemicals. The term ‘platform’ is used here to underscore that the role of N-polymers is not only to serve as direct catalysts (through loaded metals) but also as co-catalysts/promoters and stabilizing agents. This review covers the current state, advantages, challenges, and prospects of the application of N-polymer-metal composites, also referred as polymer functionalized, coated, or modified electrodes, as well as functional hybrid materials, for the electrocatalytic conversion of CO2. It briefly surveys the efficiencies of the N-polymer-metal electrodes already used for this application, methods of their fabrication, and proposed mechanisms of their catalytic activities.
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      PubDate: 2017-06-29T03:08:17Z
      DOI: 10.1016/j.cis.2016.09.002
      Issue No: Vol. 244 (2017)
       
  • Solution-phase synthesis of transition metal oxide nanocrystals:
           Morphologies, formulae, and mechanisms
    • Authors: Liang Qiao; Mark T. Swihart
      Pages: 199 - 266
      Abstract: Publication date: June 2017
      Source:Advances in Colloid and Interface Science, Volume 244
      Author(s): Liang Qiao, Mark T. Swihart
      In this review, we provide a broad overview of solution-phase synthesis of transition metal oxide nanocrystals (NCs), including a substantial catalog of published methods, and a unifying classification and discussion. Prevalent subcategories of solution-phase synthesis are delineated and general features are summarized. The diverse morphologies achievable by solution-phase synthesis are defined and exemplified. This is followed by sequential consideration of the solution-phase synthesis of first-row transition metal oxides. The common oxides of Ti, V, Mn, Fe, Co, Ni, Cu, and Zn are introduced; major crystal lattices are presented and illustrated; representative examples are explained; and numerous synthesis formulae are tabulated. Following this presentation of experimental studies, we present an introduction to theories of NC nucleation and growth. Various models of NC nucleation and growth are addressed, and important concepts determining the growth and structure of colloidal NCs are explained. Overall, this review provides an entry into systematic understanding of solution-phase synthesis of nanocrystals, with a reasonably comprehensive survey of results for the important category of transition metal oxide NCs.
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      PubDate: 2017-06-29T03:08:17Z
      DOI: 10.1016/j.cis.2016.01.005
      Issue No: Vol. 244 (2017)
       
  • Revisiting the flocculation kinetics of destabilized asphaltenes
    • Authors: Cláudio Vilas Bôas Fávero; Tabish Maqbool; Michael Hoepfner; Nasim Haji-Akbari; H. Scott Fogler
      Pages: 267 - 280
      Abstract: Publication date: June 2017
      Source:Advances in Colloid and Interface Science, Volume 244
      Author(s): Cláudio Vilas Bôas Fávero, Tabish Maqbool, Michael Hoepfner, Nasim Haji-Akbari, H. Scott Fogler
      A comprehensive review of the recently published work on asphaltene destabilization and flocculation kinetics is presented. Four different experimental techniques were used to study asphaltenes undergoing flocculation process in crude oils and model oils. The asphaltenes were destabilized by different n-alkanes and a geometric population balance with the Smoluchowski collision kernel was used to model the asphaltene aggregation process. Additionally, by postulating a relation between the aggregation collision efficiency and the solubility parameter of asphaltenes and the solution, a unified model of asphaltene aggregation model was developed. When the aggregation model is applied to the experimental data obtained from several different crude oil and model oils, the detection time curves collapsed onto a universal single line, indicating that the model successfully captures the underlying physics of the observed process.
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      PubDate: 2017-06-29T03:08:17Z
      DOI: 10.1016/j.cis.2016.06.013
      Issue No: Vol. 244 (2017)
       
  • Functional calcium phosphate composites in nanomedicine
    • Authors: Francesca Ridi; Ilaria Meazzini; Benedetta Castroflorio; Massimo Bonini; Debora Berti; Piero Baglioni
      Pages: 281 - 295
      Abstract: Publication date: June 2017
      Source:Advances in Colloid and Interface Science, Volume 244
      Author(s): Francesca Ridi, Ilaria Meazzini, Benedetta Castroflorio, Massimo Bonini, Debora Berti, Piero Baglioni
      Calcium phosphate (CaP) materials have many peculiar and intriguing properties. In nature, CaP is found in nanostructured form embedded in a soft proteic matrix as the main mineral component of bones and teeth. The extraordinary stoichiometric flexibility, the different stabilities exhibited by its different forms as a function of pH and the highly dynamic nature of its surface ions, render CaP one of the most versatile materials for nanomedicine. This review summarizes some of the guidelines so far emerged for the synthesis of CaP composites in aqueous media that endow the material with tailored crystallinity, morphology, size, and functional properties. First, we introduce very briefly the areas of application of CaP within the nanomedicine field. Then through some selected examples, we review some synthetic routes where the presence of functional units (small templating molecules like surfactants, or oligomers and polymers) assists the synthesis and at the same time impart the functionality or the responsiveness desired for the end-application of the material. Finally, we illustrate two examples from our laboratory, where CaP is decorated by biologically active polymers or prepared within a thermo- and magneto-responsive hydrogel, respectively.
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      PubDate: 2017-06-29T03:08:17Z
      DOI: 10.1016/j.cis.2016.03.006
      Issue No: Vol. 244 (2017)
       
  • Dynamics of Network Fluids
    • Authors: C.S. Dias; N.A.M. Araújo; M.M. Telo da Gama
      Abstract: Publication date: Available online 6 July 2017
      Source:Advances in Colloid and Interface Science
      Author(s): C.S. Dias, N.A.M. Araújo, M.M. Telo da Gama
      Network fluids are structured fluids consisting of chains and branches. They are characterized by unusual physical properties, such as, exotic bulk phase diagrams, interfacial roughening and wetting transitions, and equilibrium and nonequilibrium gels. Here, we provide an overview of a selection of their equilibrium and dynamical properties. Recent research efforts towards bridging equilibrium and non-equilibrium studies are discussed, as well as several open questions.
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      PubDate: 2017-07-09T03:55:41Z
      DOI: 10.1016/j.cis.2017.07.001
       
  • Formation of protein/surfactant adsorption layer as studied by dilational
           surface rheology
    • Authors: Boris A. Noskov; Michael M. Krycki
      Abstract: Publication date: Available online 6 July 2017
      Source:Advances in Colloid and Interface Science
      Author(s): Boris A. Noskov, Michael M. Krycki
      The review discusses the mechanism of formation of protein/surfactant adsorption layers at the liquid – gas interface. The complexes of globular proteins usually preserve their compact structure a low surfactant concentrations. Therefore a simple kinetic model of the adsorption of charged compact nanoparticles is discussed first and compared with experimental data. The increase of surfactant concentrations results in various conformational transitions in the surface layer. One can obtain information on the changes of the adsorption layer structure using the dilational surface rheology. The kinetic dependencies of the dynamic surface elasticity are strongly different for the adsorption of unfolded macromolecules and compact globules, and have local maxima in the former case corresponding to different steps of the adsorption. These distinctions allow tracing the changes of the tertiary structure of protein/surfactant complexes in the surface layer. The adsorption from mixed solutions of ionic surfactants with β-casein, β-lactoglobulin, bovine serum albumin and myoglobin is discussed with some details.
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      PubDate: 2017-07-09T03:55:41Z
      DOI: 10.1016/j.cis.2017.07.003
       
  • Advances and challenges in the rheology of concentrated emulsions and
           nanoemulsions
    • Authors: Ha Seong Kim; Thomas G. Mason
      Abstract: Publication date: Available online 5 July 2017
      Source:Advances in Colloid and Interface Science
      Author(s): Ha Seong Kim, Thomas G. Mason
      We review advances made in the rheology of concentrated emulsions and nanoemulsions, which can serve as model soft materials that have highly tunable viscoelastic properties near the jamming point. Droplet interfacial and positional structures are shown to influence emulsion rheological properties such as viscoelasticity, yielding, and flow behavior via presentation of recent experimentation and theoretical models. We emphasize studies of emulsions composed of monodisperse droplets since these have led to breakthroughs in fundamental understanding. In addition, we summarize experiments which demonstrate that emulsions can have material memory and rheological properties that depend on the applied flow history, since these can affect droplet interfacial and positional structures. We also cover the rheology of attractive emulsions, which can still have a dominant elasticity at droplet volume fractions far below jamming.
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      PubDate: 2017-07-09T03:55:41Z
      DOI: 10.1016/j.cis.2017.07.002
       
  • A comparison between liquid drops and solid particles in partial wetting
    • Authors: Antonio Stocco; Maurizio Nobili
      Abstract: Publication date: Available online 1 July 2017
      Source:Advances in Colloid and Interface Science
      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: 2017-07-09T03:55:41Z
      DOI: 10.1016/j.cis.2017.06.014
       
  • Impact of albumin based approaches in nanomedicine: Imaging, targeting and
           drug delivery
    • Authors: Bharat Bhushan; Vitaly Khanadeev; Boris Khlebtsov; Nikolai Khlebtsov; P. Gopinath
      Abstract: Publication date: Available online 1 July 2017
      Source:Advances in Colloid and Interface Science
      Author(s): Bharat Bhushan, Vitaly Khanadeev, Boris Khlebtsov, Nikolai Khlebtsov, P. Gopinath
      A major challenge in the field of nanomedicine is to transform laboratory innovations into commercially successful clinical products. In this campaign, a variety of nanoenabled approaches have been designed and investigated for their role in biomedical applications. The advantages associated with the unique structure of albumin imparts it with the ability to interact with variety of molecules, while the functional groups present on their surface provide base for large number of modifications making it as an ideal nanocarrier system. So far, a variety of albumin based nanoenabled approaches have been intensively exploited for effective diagnosis and personalized medicine, among them some have successfully completed their journey from lab bench to marketed products. This review focuses on the recent most promising advancement in the field of albumin based nanoenabled approaches for various biomedical applications and their potential use in cancer diagnosis and therapy.
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      PubDate: 2017-07-09T03:55:41Z
      DOI: 10.1016/j.cis.2017.06.012
       
  • Relationship between processing history and functionality recovery after
           rehydration of dried cellulose-based suspensions: A critical review
    • Authors: Isabelle Déléris; Joël Wallecan
      Abstract: Publication date: Available online 30 June 2017
      Source:Advances in Colloid and Interface Science
      Author(s): Isabelle Déléris, Joël Wallecan
      Cellulose-based suspensions have raised more and more attention due to their broad range of properties that can be used in paper industry and material science but also in medicine, nanotechnology and food science. Their final functionality is largely dependent on their processing history and notably the structural modifications that occur during drying and rehydration. The purpose of this work is to make a state-of-the-art contribution to the mechanisms involved in the process-structure-function relationships of cellulose-based hydrogels. The different assumptions that exist in the literature are reviewed taking the key role of the initial sample characteristics as well as the processing conditions into consideration. The decrease in swelling ability after drying is clearly due to an overall shrinkage of the structure of the material. At microscale, pore closure and cellulosic fibril aggregation are mentioned as the main reasons. The origins of such irreversible structural modifications take place at molecular level and is mainly explained by the establishment of a new balance of interactions between all components. Nevertheless, the respective contribution of each interaction are still under investigation.
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      PubDate: 2017-07-09T03:55:41Z
      DOI: 10.1016/j.cis.2017.06.013
       
  • Micro and nanobubble technologies as a new horizon for water-treatment
           techniques: A review
    • Authors: Tatek Temesgen; Thi Thuy Bui; Mooyoung Han; Tschung-il Kim; Hyunju Park
      Abstract: Publication date: Available online 27 June 2017
      Source:Advances in Colloid and Interface Science
      Author(s): Tatek Temesgen, Thi Thuy Bui, Mooyoung Han, Tschung-il Kim, Hyunju Park
      This review article organizes the studies conducted on the areas of microbubbles and nanobubbles with a special emphasis on water treatment. The basic definitions of bubble types and their size ranges are also presented based on the explanations of different researchers. The characterization parameters with state-of-the-art measuring and analysis techniques of microbubble and nanobubble technologies are summarized. Some major applications of these technologies in water-treatment processes are reviewed and briefly discussed. Based on the reviews, various potential areas for research and bubble application gaps in water and wastewater treatment technologies are identified for further study. The article is prepared in such a way that it provides a step-by-step acquaintance to the subject matter with the objective of focusing on the application of microbubbles and nanobubbles in water-treatment technology.
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      PubDate: 2017-06-29T03:08:17Z
      DOI: 10.1016/j.cis.2017.06.011
       
  • Emerging nanotechnology based strategies for diagnosis and therapeutics of
           urinary tract infections: A review
    • Authors: M.S. Kumar; A.P. Das
      Abstract: Publication date: Available online 26 June 2017
      Source:Advances in Colloid and Interface Science
      Author(s): M.S. Kumar, A.P. Das
      At present, various diagnostic and therapeutic approaches are available for urinary tract infections. But, still the quest for development of more rapid, accurate and reliable approach is an unending process. The pathogens, especially uropathogens are adapting to new environments and antibiotics day by day rapidly. Therefore, urinary tract infections are evolving as hectic and difficult to eradicate, increasing the economic burden to the society. The technological advances should be able to compete the adaptability characteristics of microorganisms to combat their growth in new environments and thereby preventing their infections. Nanotechnology is at present an extensively developing area of immense scientific interest since it has diverse potential applications in biomedical field. Nanotechnology may be combined with cellular therapy approaches to overcome the limitations caused by conventional therapeutics. Nanoantibiotics and drug delivery using nanotechnology are currently growing areas of research in biomedical field. Recently, various categories of antibacterial nanoparticles and nanocarriers for drug delivery have shown their potential in the treatment of infectious diseases. Nanoparticles, compared to conventional antibiotics, are more beneficial in terms of decreasing toxicity, prevailing over resistance and lessening costs. Nanoparticles present long term therapeutic effects since they are retained in body for relatively longer periods. This review focuses on recent advances in the field of nanotechnology, principally emphasizing diagnostics and therapeutics of urinary tract infections.
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      PubDate: 2017-06-29T03:08:17Z
      DOI: 10.1016/j.cis.2017.06.010
       
  • Surfactant films in lyotropic lamellar (and related) phases: Fluctuations
           and interactions
    • Authors: Nallet
      Abstract: Publication date: Available online 24 June 2017
      Source:Advances in Colloid and Interface Science
      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.
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      PubDate: 2017-06-29T03:08:17Z
       
  • ifc (ed board)
    • Abstract: Publication date: June 2017
      Source:Advances in Colloid and Interface Science, Volume 244


      PubDate: 2017-06-29T03:08:17Z
       
  • special contents
    • Abstract: Publication date: June 2017
      Source:Advances in Colloid and Interface Science, Volume 244


      PubDate: 2017-06-29T03:08:17Z
       
  • Critical evaluation of dipolar, acid-base and charge interactions I.
           Electron displacement within and between molecules, liquids and
           semiconductors
    • Authors: Jarl B. Rosenholm
      Abstract: Publication date: Available online 21 June 2017
      Source:Advances in Colloid and Interface Science
      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: 2017-06-21T11:00:39Z
      DOI: 10.1016/j.cis.2017.06.004
       
  • Electrokinetic transport in liquid foams
    • Authors: Oriane Bonhomme; Baptiste Blanc; Laurent Joly; Christophe Ybert; Anne-Laure Biance
      Abstract: Publication date: Available online 17 June 2017
      Source:Advances in Colloid and Interface Science
      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 thorougly studied over the past decade. The overlaping 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: 2017-06-21T11:00:39Z
      DOI: 10.1016/j.cis.2017.06.005
       
  • Synthesis of some transition metal (M: 25Mn, 27Co, 28Ni, 29Cu, 30Zn, 47Ag,
           48Cd) sulfide nanostructures by hydrothermal method
    • Authors: Hamid Emadi; Masoud Salavati-Niasari; Azam Sobhani
      Abstract: Publication date: Available online 16 June 2017
      Source:Advances in Colloid and Interface Science
      Author(s): Hamid Emadi, Masoud Salavati-Niasari, Azam Sobhani
      The design of nanostructures with favored shape, particle size and structure is one of the most important fields of nanoscience. To reach this target hydrothermal method is one of the most applicable methods which allow us to obtain favored structures by changing some parameters. This review focuses on synthesis of some transition metal sulfides by hydrothermal method because of technological importance of this group of material. The common sulfides of Mn, Co, Ni, Cu, Zn, Ag and Cd are introduced and a mechanism proposed for their synthesis. The effects of temperature and time reaction, surfactant, reactants concentration, metal and sulfur sources and etc. on the morphology, particle size and some properties of the products are investigated. SEM and TEM images show the morphology and size of the as-synthesized samples. Chemical composition of the samples is characterized by XRD, EDS and etc. The magnetic, optical and thermoelectric properties of the metal sulfides are investigated.
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      PubDate: 2017-06-21T11:00:39Z
      DOI: 10.1016/j.cis.2017.06.007
       
  • An interferometric technique to study capillary waves
    • Authors: Laura Cantu'; Antonio Raudino; Mario Corti
      Abstract: Publication date: Available online 15 June 2017
      Source:Advances in Colloid and Interface Science
      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.
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      PubDate: 2017-06-21T11:00:39Z
      DOI: 10.1016/j.cis.2017.06.006
       
  • ifc (ed board)
    • Abstract: Publication date: July 2017
      Source:Advances in Colloid and Interface Science, Volume 245


      PubDate: 2017-06-15T01:39:24Z
       
  • Sensors and bioassays powered by upconverting materials
    • Authors: Diego Mendez-Gonzalez; Enrique Lopez-Cabarcos; Jorge Rubio-Retama; Marco Laurenti
      Abstract: Publication date: Available online 10 June 2017
      Source:Advances in Colloid and Interface Science
      Author(s): Diego Mendez-Gonzalez, Enrique Lopez-Cabarcos, Jorge Rubio-Retama, Marco Laurenti
      In recent years, considerable efforts have been done to better understand the peculiar emission properties of upconverting materials due to their widespread applications in different and important technological fields such as upconversion-based photoactivated cancer therapies, photoactivated drug-delivery, magnetic resonance imaging contrast agents, bioimaging. However, one of the most promising applications of upconverting materials concerns the field of sensing, due to their unique emission properties. In fact, the minimal autofluorescence, blinking, photo-bleaching, and high photostability makes them an excellent alternative to organic dyes or quantum dots. This article reviews the state-of-the-art, design, and sensing strategies of upconversion-based sensing platforms, with special attention to upconverting nanoparticles, as well as how the incorporation of these materials into pre-existing diagnostic tests and bioassays have improved their capabilities for the detection of different kinds of analytes.
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      PubDate: 2017-06-11T01:37:08Z
      DOI: 10.1016/j.cis.2017.06.003
       
  • Continuum-based models and concepts for the transport of nanoparticles in
           saturated porous media: A state-of-the-science review
    • Authors: Peyman Babakhani; Jonathan Bridge; Ruey-an Doong; Tanapon Phenrat
      Abstract: Publication date: Available online 7 June 2017
      Source:Advances in Colloid and Interface Science
      Author(s): Peyman Babakhani, Jonathan Bridge, Ruey-an Doong, Tanapon Phenrat
      Environmental applications of NP increasingly result in widespread NP distribution within porous media where they are subject to various concurrent transport mechanisms including irreversible deposition, attachment/detachment (equilibrium or kinetic), agglomeration, physical straining, site-blocking, ripening, and size exclusion. Fundamental research in NP transport is typically conducted at small scale, and theoretical mechanistic modeling of particle transport in porous media faces challenges when considering the simultaneous effects of transport mechanisms. Continuum modeling approaches, in contrast, are scalable across various scales ranging from column experiments to aquifer. They have also been able to successfully describe the simultaneous occurrence of various transport mechanisms of NP in porous media such as blocking/straining or agglomeration/deposition/detachment. However, the diversity of model equations developed by different authors and the lack of effective approaches for their validation present obstacles to the successful robust application of these models for describing or predicting NP transport phenomena. This review aims to describe consistently all the important NP transport mechanisms along with their representative mathematical continuum models as found in the current scientific literature. Detailed characterizations of each transport phenomenon in regards to their manifestation in the column experiment outcomes, i.e., breakthrough curve (BTC) and residual concentration profile (RCP), are presented to facilitate future interpretations of BTCs and RCPs. The review highlights two NP transport mechanisms, agglomeration and size exclusion, which are potentially of great importance in controlling the fate and transport of NP in the subsurface media yet have been widely neglected in many existing modeling studies. A critical limitation of the continuum modeling approach is the number of parameters used upon application to larger scales and when a series of transport mechanisms are involved. We investigate the use of simplifying assumptions, such as the equilibrium assumption, in modeling the attachment/detachment mechanisms within a continuum modelling framework. While acknowledging criticisms about the use of this assumption for NP deposition on a mechanistic (process) basis, we found that its use as a description of dynamic deposition behavior in a continuum model yields broadly similar results to those arising from a kinetic model. Furthermore, we show that in two dimensional (2-D) continuum models the modeling efficiency based on the Akaike information criterion (AIC) is enhanced for equilibrium vs kinetic with no significant reduction in model performance. This is because fewer parameters are needed for the equilibrium model compared to the kinetic model. Two major transport regimes are identified in the transport of NP within porous media. The first regime is characterized by higher particle-surface attachment affinity than particle-particle attachment affinity, and operative transport mechanisms of physicochemical filtration, blocking, and physical retention. The second regime is characterized by the domination of particle-particle attachment tendency over particle-surface affinity. In this regime although physicochemical filtration as well as straining may still be operative, ripening is predominant together with agglomeration and further subsequent retention. In both regimes careful assessment of NP fate and transport is necessary since certain combinations of concurrent transport phenomena leading to large migration distances are possible in either case.
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      PubDate: 2017-06-11T01:37:08Z
      DOI: 10.1016/j.cis.2017.06.002
       
  • The interaction of antimicrobial peptides with membranes
    • Authors: Oksana G. Travkova; Helmuth Moehwald; Gerald Brezesinski
      Abstract: Publication date: Available online 5 June 2017
      Source:Advances in Colloid and Interface Science
      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: 2017-06-06T01:18:51Z
      DOI: 10.1016/j.cis.2017.06.001
       
  • Liposomes and lipid bilayers in biosensors
    • Authors: Federico Mazur; Marta Bally; Brigitte Städler; Rona Chandrawati
      Abstract: Publication date: Available online 31 May 2017
      Source:Advances in Colloid and Interface Science
      Author(s): Federico Mazur, Marta Bally, Brigitte Städler, Rona Chandrawati
      Biosensors for the rapid, specific, and sensitive detection of analytes play a vital role in healthcare, drug discovery, the maintenance of food safety, and environmental monitoring. Although a number of sensing concepts and devices have been developed, many longstanding challenges to obtain inexpensive, easy-to-use, and reliable sensor platforms remain largely unmet. Nanomaterials offer exciting possibilities for enhancing the assay sensitivity and detection limits down to a single-molecule resolution. In this review, we present an overview of liposomes and lipid bilayers in biosensing applications. Lipid assemblies in the form of spherical liposomes or two-dimensional planar membranes have been widely used in the design of biosensing assays; in particular, we highlight a number of recent promising developments of biosensors based on liposomes in suspension, liposome arrays, and lipid bilayers arrays. Assay sensitivity and specificity are discussed, advantages and drawbacks are reviewed, and possible further developments are outlined.
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      PubDate: 2017-06-01T10:59:12Z
      DOI: 10.1016/j.cis.2017.05.020
       
  • Recent experimental advances for understanding bubble-particle attachment
           in flotation
    • Authors: Yaowen Xing; Xiahui Gui; Lei Pan; Bat-El Pinchasik; Yijun Cao; Jiongtian Liu; Michael Kappl; Hans-Jürgen Butt
      Abstract: Publication date: Available online 31 May 2017
      Source:Advances in Colloid and Interface Science
      Author(s): Yaowen Xing, Xiahui Gui, Lei Pan, Bat-El Pinchasik, Yijun Cao, Jiongtian Liu, Michael Kappl, Hans-Jürgen Butt
      Bubble-particle interaction is of great theoretical and practical importance in flotation. Significant progress has been achieved over the past years. E.g. the process of bubble-particle collision is reasonably well understood. This, however, is not the case for bubble-particle attachment leading to three-phase contact line formation due to the difficulty in both theoretical analysis and experimental verification. For attachment, surface forces play a major role. They control the thinning and rupture of the thin liquid film between the bubble and the particle. The dynamic coupling between force, bubble deformation and film drainage is critical to understand the underlying mechanism responsible for bubble-particle attachment. In this review we first discuss the advances in macroscopic experimental methods for characterizing bubble-particle attachment such as induction timer and high speed visualization. Then we focus on advances in measuring the force and drainage of thin liquid films between an air bubble and a solid surface at a nanometer scale. Advances, limits, challenges, and future research opportunities are discussed. By combining atomic force microscopy and reflection interference contrast microscopy, the force, bubble deformation, and liquid film drainage can be measured simultaneously. The simultaneous measurement of the interaction force and the spatiotemporal evolution of the confined liquid film hold great promise to shed new light on flotation.
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      PubDate: 2017-06-01T10:59:12Z
      DOI: 10.1016/j.cis.2017.05.019
       
  • A review on the mechanical and thermodynamic robustness of
           superhydrophobic surfaces
    • Authors: Liam R.J. Scarratt; Ullrich Steiner; Chiara Neto
      Abstract: Publication date: Available online 30 May 2017
      Source:Advances in Colloid and Interface Science
      Author(s): Liam R.J. Scarratt, Ullrich Steiner, Chiara Neto
      Advancements in the fabrication and study of superhydrophobic surfaces have been significant over the past 10years, and some 20years after the discovery of the lotus effect, the study of special wettability surfaces can be considered mainstream. While the fabrication of superhydrophobic surfaces is well advanced and the physical properties of superhydrophobic surfaces well-understood, the robustness of these surfaces, both in terms of mechanical and thermodynamic properties, are only recently getting attention in the literature. In this review we cover publications that appeared over the past ten years on the thermodynamic and mechanical robustness of superhydrophobic surfaces, by which we mean the long term stability under conditions of wear, shear and pressure. The review is divided into two parts, the first dedicated to thermodynamic robustness and the second dedicated to mechanical robustness of these complex surfaces. Our work is intended as an introductory review for researchers interested in addressing longevity and stability of superhydrophobic surfaces, and provides an outlook on outstanding aspects of investigation.
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      PubDate: 2017-06-01T10:59:12Z
      DOI: 10.1016/j.cis.2017.05.018
       
  • Monitoring the different micelle species and the slow kinetics of
           tetraethylammonium perfluorooctane-sulfonate by 19F NMR spectroscopy
    • Authors: Xiaolin Wang; Jingfei Chen Dong Wang Shuli Dong Jingcheng Hao
      Abstract: Publication date: Available online 26 May 2017
      Source:Advances in Colloid and Interface Science
      Author(s): Xiaolin Wang, Jingfei Chen, Dong Wang, Shuli Dong, Jingcheng Hao, Heinz Hoffmann
      Since we lack effective tools that can monitor the structures of surfactant micelles in situ, the different equilibrium species and the slow kinetics of micelles are still not well understood. Herein, by using 19F NMR, we simultaneously monitored that micelles of tetraethylammonium perfluorooctanesulfonate (TPFOS, C8F17SO3N(C2H5)4) in water grow more complex in virtue of hydrophobic counterions and the slow kinetic exchange process exists in the system. Apart from the monomeric signals, three sets of micelle signals which correspond to spherical micelles, wormlike/wormlike micelles with rings in end caps and toroidal micelles were successfully detected on the NMR time scale because of the slow exchange rate for surfactant molecules between the monomer and the micelle states. By comparison, other fluoro- and hydrocarbon surfactants with different tail lengths and counterions (+ N(CH3)4, + N(C3H7)4, Li+ and Na+) have been studied, and the coexistence of different micelles could also been observed for the aqueous solution of C9F19COON(CH3)4. However, only one set of averaged NMR signals could be observed for these surfactants. The micellization of TPFOS in water is demonstrated to be a predominantly entropy-driven process. Molecular dynamics (MD) simulation revealed an unusual distribution of counterions, providing further understanding of the mechanism of the micelle formation process.
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      PubDate: 2017-05-27T03:25:07Z
       
  • 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: Available online 15 May 2017
      Source:Advances in Colloid and Interface Science
      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.
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      PubDate: 2017-05-16T20:32:31Z
       
  • Formulation, stabilisation and encapsulation of bacteriophage for phage
           therapy
    • Authors: Danish J. Malik; Ilya J. Sokolov; Gurinder V. Vinner; Francesco Mancuso; Salvatore Cinquerrui; Goran T. Vladisavljevic; Martha R.J. Clokie; Natalie J. Garton; Andrew G.F. Stapley; Anna Kirpichnikova
      Abstract: Publication date: Available online 14 May 2017
      Source:Advances in Colloid and Interface Science
      Author(s): Danish J. Malik, Ilya J. Sokolov, Gurinder V. Vinner, Francesco Mancuso, Salvatore Cinquerrui, Goran T. Vladisavljevic, Martha R.J. Clokie, Natalie J. Garton, Andrew G.F. Stapley, Anna Kirpichnikova
      Against a backdrop of global antibiotic resistance and increasing awareness of the importance of the human microbiota, there has been resurgent interest in the potential use of bacteriophages for therapeutic purposes, known as phage therapy. A number of phage therapy phase I and II clinical trials have concluded, and shown phages don't present significant adverse safety concerns. These clinical trials used simple phage suspensions without any formulation and phage stability was of secondary concern. Phages have a limited stability in solution, and undergo a significant drop in phage titre during processing and storage which is unacceptable if phages are to become regulated pharmaceuticals, where stable dosage and well defined pharmacokinetics and pharmacodynamics are de rigueur. Animal studies have shown that the efficacy of phage therapy outcomes depend on the phage concentration (i.e. the dose) delivered at the site of infection, and their ability to target and kill bacteria, arresting bacterial growth and clearing the infection. In addition, in vitro and animal studies have shown the importance of using phage cocktails rather than single phage preparations to achieve better therapy outcomes. The in vivo reduction of phage concentration due to interactions with host antibodies or other clearance mechanisms may necessitate repeated dosing of phages, or sustained release approaches. Modelling of phage-bacterium population dynamics reinforces these points. Surprisingly little attention has been devoted to the effect of formulation on phage therapy outcomes, given the need for phage cocktails, where each phage within a cocktail may require significantly different formulation to retain a high enough infective dose. This review firstly looks at the clinical needs and challenges (informed through a review of key animal studies evaluating phage therapy) associated with treatment of acute and chronic infections and the drivers for phage encapsulation. An important driver for formulation and encapsulation is shelf life and storage of phage to ensure reproducible dosages. Other drivers include formulation of phage for encapsulation in micro- and nanoparticles for effective delivery, encapsulation in stimuli responsive systems for triggered controlled or sustained release at the targeted site of infection. Encapsulation of phage (e.g. in liposomes) may also be used to increase the circulation time of phage for treating systemic infections, for prophylactic treatment or to treat intracellular infections. We then proceed to document approaches used in the published literature on the formulation and stabilisation of phage for storage and encapsulation of bacteriophage in micro- and nanostructured materials using freeze drying (lyophilization), spray drying, in emulsions e.g. ointments, polymeric microparticles, nanoparticles and liposomes. As phage therapy moves forward towards Phase III clinical trials, the review concludes by looking at promising new approaches for micro- and nanoencapsulation of phages and how these may address gaps in the field.
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      PubDate: 2017-05-16T20:32:31Z
      DOI: 10.1016/j.cis.2017.05.014
       
  • Multicomponent nanocrystals with anti-Stokes luminescence as contrast
           agents for modern imaging techniques
    • Authors: A.N. Generalova; B.N. Chichkov; E.V. Khaydukov
      Abstract: Publication date: Available online 4 May 2017
      Source:Advances in Colloid and Interface Science
      Author(s): A.N. Generalova, B.N. Chichkov, E.V. Khaydukov
      Lanthanide-doped upconversion nanoparticles (UCNPs) have recently attracted great attention in theranostics due to their exceptional optical and physicochemical properties, which enable the design of a novel UCNP-based nanoplatform for luminescent imaging, temperature mapping, sensing, and therapy. In addition, UCNPs are considered to be ideal building blocks for development of multimodal probes for cells and whole body imaging, exploiting simple variation of host matrix, dopant ions, and surface chemistry. Modalities responsible for magnetic resonance imaging (MRI), computed tomography (CT), and positron emission tomography (PET)/single-photon emission computed tomography (SPECT) are embedded in a single UC nanocrystal, providing integrating effect over any modality alone in terms of the efficiency and sensitivity for clinical innovative diagnosis through multimodal bioimaging. In particular, we demonstrate applications of UCNPs as a new nanoplatform for optical and multimodal cancer imaging in vitro and in vivo and extend discussions to delivery of UCNP-based therapeutic agents for photodynamic and photothermal cancer treatments.
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      PubDate: 2017-05-07T01:00:57Z
      DOI: 10.1016/j.cis.2017.05.006
       
  • Probing the threshold of membrane damage and cytotoxicity effects induced
           by silica nanoparticles in Escherichia coli bacteria
    • Authors: Marion Mathelié-Guinlet; Laure Béven; Fabien Moroté; Daniel Moynet; Christine Grauby-Heywang; Ibtissem Gammoudi; Marie-Hélène Delville; Touria Cohen-Bouhacina
      Abstract: Publication date: Available online 28 April 2017
      Source:Advances in Colloid and Interface Science
      Author(s): Marion Mathelié-Guinlet, Laure Béven, Fabien Moroté, Daniel Moynet, Christine Grauby-Heywang, Ibtissem Gammoudi, Marie-Hélène Delville, Touria Cohen-Bouhacina
      The engineering of nanomaterials, because of their specific properties, is increasingly being developed for commercial purposes over the past decades, to enhance diagnosis, cosmetics properties as well as sensing efficiency. However, the understanding of their fate and thus their interactions at the cellular level with bio-organisms remains elusive. Here, we investigate the size- and charge-dependence of the damages induced by silica nanoparticles (SiO2-NPs) on Gram-negative Escherichia coli bacteria. We show and quantify the existence of a NPs size threshold discriminating toxic and inert SiO2-NPs with a critical particle diameter (Φc) in the range 50nm–80nm. This particular threshold is identified at both the micrometer scale via viability tests through Colony Forming Units (CFU) counting, and the nanometer scale via atomic force microscopy (AFM). At this nanometer scale, AFM emphasizes the interaction between the cell membrane and SiO2-NPs from both topographic and mechanical points of view. For SiO2-NPs with Φ>Φc no change in E. coli morphology nor its outer membrane (OM) organization is observed unless the NPs are positively charged in which case reorganization and disruption of the OM are detected. Conversely, when Φ<Φc, E. coli exhibit unusual spherical shapes, partial collapse, even lysis, and OM reorganization.
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      PubDate: 2017-05-01T02:08:02Z
      DOI: 10.1016/j.cis.2017.04.012
       
  • Applications of artificial neural networks for adsorption removal of dyes
           from aqueous solution: A review
    • Authors: Abdol Mohammad Ghaedi; Azam Vafaei
      Abstract: Publication date: Available online 26 April 2017
      Source:Advances in Colloid and Interface Science
      Author(s): Abdol Mohammad Ghaedi, Azam Vafaei
      Artificial neural networks (ANNs) have been widely applied for the prediction of dye adsorption during the last decade. In this paper, the applications of ANN methods, namely multilayer feedforward neural networks (MLFNN), support vector machine (SVM), and adaptive neuro fuzzy inference system (ANFIS) for adsorption of dyes are reviewed. The reported researches on adsorption of dyes are classified into four major categories, such as (i) MLFNN, (ii) ANFIS, (iii) SVM and (iv) hybrid with genetic algorithm (GA) and particle swarm optimization (PSO). Most of these papers are discussed. The further research needs in this field are suggested. These ANNs models are obtaining popularity as approaches, which can be successfully employed for the adsorption of dyes with acceptable accuracy.
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      PubDate: 2017-05-01T02:08:02Z
      DOI: 10.1016/j.cis.2017.04.015
       
  • Colloidal 2D nanosheets of MoS2 and other transition metal dichalcogenides
           through liquid-phase exfoliation
    • Authors: Ekaterina D. Grayfer; Mariia N. Kozlova; Vladimir E. Fedorov
      Abstract: Publication date: Available online 25 April 2017
      Source:Advances in Colloid and Interface Science
      Author(s): Ekaterina D. Grayfer, Mariia N. Kozlova, Vladimir E. Fedorov
      This review focuses on the exfoliation of transition metal dichalcogenides MQ2 (TMD, M=Mo, W etc., Q=S, Se) in liquid media, leading to the formation of 2D nanosheets dispersed in colloids. Nowadays, colloidal dispersions of MoS2, MoSe2, WS2 and other related materials are considered for a wide range of applications, including electronic and optoelectronic devices, energy storage and conversion, sensors for gases, catalysts and catalyst supports, biomedicine etc. We address various methods developed so far for transferring these materials from bulk to nanoscale thickness, and discuss their stabilization and factors influencing it. Long-time known exfoliation through Li intercalation has received renewed attention in recent years, and is recognized as a method yielding highest dispersed concentrations of single-layer MoS2 and related materials. Latest trends in the intercalation/exfoliation approach include electrochemical lithium intercalation, experimenting with various intercalating agents, multi-step intercalation etc. On the other hand, direct sonication in solvents is a much simpler technique that allows one to avoid dangerous reagents, long reaction times and purifying steps. The influence of the solvent characteristics on the colloid formation was closely investigated in numerous recent studies. Moreover, it is being recognized that, besides solvent properties, sonication parameters and solvent transformations may affect the process in a crucial way. The latest data on the interaction of MoS2 with solvents evidences that not only solution thermodynamics should be employed to understand the formation and stabilization of such colloids, but also general and organic chemistry. It appears that due to the sonolysis of the solvents and cutting of the MoS2 layers in various directions, the reactive edges of the colloidal nanosheets may bear various functionalities, which participate in their stabilization in the colloidal state. In most cases, direct exfoliation of MQ2 into colloidal nanosheets is conducted in organic solvents, while a small amount of works report low-concentrated colloids in pure water. To improve the dispersion abilities of transition metal dichalcogenides in water, various stabilizers are often introduced into the reaction media, and their interactions with nanosheets play an important role in the stabilization of the dispersions. Surfactants, polymers and biomolecules usually interact with transition metal dichalcogenide nanosheets through non-covalent mechanisms, similarly to the cases of graphene and carbon nanotubes. Finally, we survey covalent chemical modification of colloidal MQ2 nanosheets, a special and different approach, consisting in the functionalization of MQ2 surfaces with help of thiol chemistry, interaction with electrophiles, or formation of inorganic coordination complexes. The intentional design of surface chemistry of the nanosheets is a very promising way to control their solubility, compatibility with other moieties and incorporation into hybrid structures. Although the scope of the present review is limited to transition metal dichalcogenides, the dispersion in colloids of other chalcogenides (such as NbS3, VS4, Mo2S3 etc.) in many ways follows similar trends. We conclude the review by discussing current challenges in the area of exfoliation of MoS2 and its related materials.
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      PubDate: 2017-05-01T02:08:02Z
      DOI: 10.1016/j.cis.2017.04.014
       
  • Layered double hydroxides as the next generation inorganic anion
           exchangers: Synthetic methods versus applicability
    • Authors: Natalia Chubar; Robert Gilmour; Vasyl Gerda; Matej Mičušík; Maria Omastova; Katja Heister; Pascal Man; Jacques Fraissard; Vladimir Zaitsev
      Abstract: Publication date: Available online 25 April 2017
      Source:Advances in Colloid and Interface Science
      Author(s): Natalia Chubar, Robert Gilmour, Vasyl Gerda, Matej Mičušík, Maria Omastova, Katja Heister, Pascal Man, Jacques Fraissard, Vladimir Zaitsev
      This work is the first report that critically reviews the properties of layered double hydroxides (LDHs) on the level of speciation in the context of water treatment application and dynamic adsorption conditions, as well as the first report to associate these properties with the synthetic methods used for LDH preparation. Increasingly stronger maximum allowable concentrations (MAC) of various contaminants in drinking water and liquid foodstuffs require regular upgrades of purification technologies, which might also be useful in the extraction of valuable substances for reuse in accordance with modern sustainability strategies. Adsorption is the main separation technology that allows the selective extraction of target substances from multicomponent solutions. Inorganic anion exchangers arrived in the water business relatively recently to achieve the newly approved standards for arsenic levels in drinking water. LDHs (or hydrotalcites, HTs) are theoretically the best anion exchangers due to their potential to host anions in their interlayer space, which increases their anion removal capacity considerably. This potential of the interlayer space to host additional amounts of target aqueous anions makes the LDHs superior to bulk anion exchanger. The other unique advantage of these layered materials is the flexibility of the chemical composition of the metal oxide-based layers and the interlayer anions. However, until now, this group of “classical” anion exchangers has not found its industrial application in adsorption and catalysis at the industrial scale. To accelerate application of LDHs in water treatment on the industrial scale, the authors critically reviewed recent scientific and technological knowledge on the properties and adsorptive removal of LDHs from water on the fundamental science level. This also includes review of the research tools useful to reveal the adsorption mechanism and the material properties beyond the nanoscale. Further, these properties are considered in association with the synthetic methods by which the LDHs were produced. Special attention is paid to the LDH properties that are particularly relevant to water treatment, such as exchangeability ease of the interlayer anions and the LDH stability at the solid-water interface. Notably, the LDH properties (e.g., rich speciation, hydration, and the exchangeability ease of the interlayer anions with aqueous anions) are considered in the synthetic strategy context applied to the material preparation. One such promising synthetic method has been developed by the authors who supported their opinions by the unpublished data in addition to reviewing the literature. The reviewing approach allowed for establishing regularities between the parameters: the LDH synthetic method―structure/surface/interlayer―removal―suitability for water treatment. Specifically, this approach allowed for a conclusion about either the unsuitability or promising potential of some synthetic methods (or the removal approaches) used for the preparation of LDHs for water purification at larger scales. The overall reviewing approach undertaken by the authors in this work mainly complements the other reviews on LDHs (published over the past seven to eight years) and for the first time compares the properties of these materials beyond the nanoscale.

      PubDate: 2017-05-01T02:08:02Z
      DOI: 10.1016/j.cis.2017.04.013
       
  • Milk fat globules and associated membranes: Colloidal properties and
           processing effects
    • Authors: Annamari Jukkola; Orlando J. Rojas
      Abstract: Publication date: Available online 21 April 2017
      Source:Advances in Colloid and Interface Science
      Author(s): Annamari Jukkola, Orlando J. Rojas
      The composition and physical-chemical properties of the milk fat globule membrane (MFGM) is a subject that has gained increased interest in the field of food colloids, mainly because the nutritional and technological value of the MFGM. In fact, related changes in integrity and structure during milk processing pose a huge challenge as far as efforts directed to isolate the components of the fat globule membrane. MFGM characteristics and potential utilization are areas of contention. Thus, the effects of processing and the colloidal interactions that exist with other milk constituents need to be better understood in order to exploit milk fat and MFGM, their functionality as colloids as well as those of their components. These are the main subjects of this review, which also reports on the results of recent inquiries into MFGM structure and colloidal behavior.
      Graphical abstract image

      PubDate: 2017-04-24T05:21:54Z
      DOI: 10.1016/j.cis.2017.04.010
       
 
 
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