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  • Colloidal aspects of digestion of Pickering emulsions: Experiments and theoretical models of lipid digestion kinetics
    Adv. Colloid Interface Sci. (IF 7.346) Pub Date : 2018-10-22
    Anwesha Sarkar, Shuning Zhang, Melvin Holmes, Rammile Ettelaie
  • A critical review of the model fitting quality and parameter stability of equilibrium adsorption models
    Adv. Colloid Interface Sci. (IF 7.346) Pub Date : 2018-10-07
    Mengsu Peng, Anh V. Nguyen, Jianlong Wang, Reinhard Miller
  • 更新日期:2018-10-01
  • 更新日期:2018-09-28
  • 更新日期:2018-09-26
  • Recent progress in the engineering of multifunctional colloidal nanoparticles for enhanced photodynamic therapy and bioimaging
    Adv. Colloid Interface Sci. (IF 7.346) Pub Date : 2018-09-18
    Łukasz Lamch, Agata Pucek, Julita Kulbacka, Michał Chudy, Elżbieta Jastrzębska, Katarzyna Tokarska, Magdalena Bułka, Zbigniew Brzózka, Kazimiera A. Wilk
  • 更新日期:2018-09-05
  • Lipid nanocarriers for the loading of polyphenols – A comprehensive review
    Adv. Colloid Interface Sci. (IF 7.346) Pub Date : 2018-08-25
    S. Pimentel-Moral, M.C. Teixeira, A.R. Fernandes, D. Arráez-Román, A. Martínez-Férez, A. Segura-Carretero, E.B. Souto
  • Modelling cavitation during drop impact on solid surfaces
    Adv. Colloid Interface Sci. (IF 7.346) Pub Date : 2018-08-25
    Nikolaos Kyriazis, Phoevos Koukouvinis, Manolis Gavaises
  • 更新日期:2018-08-26
  • Binary colloidal crystals (BCCs): Interactions, fabrication, and applications
    Adv. Colloid Interface Sci. (IF 7.346) Pub Date : 2018-08-23
    Farhana Sharmin Diba, Andrew Boden, Helmut Thissen, Mrinal Bhave, Peter Kingshott, Peng-Yuan Wang
  • 更新日期:2018-08-18
  • Recent advances in polymerizations in dispersed media
    Adv. Colloid Interface Sci. (IF 7.346) Pub Date : 2018-08-09
    Ratchapol Jenjob, Farzad Seidi, Daniel Crespy
  • Engineering intelligent particle-lipid composites that control lipase-mediated digestion
    Adv. Colloid Interface Sci. (IF 7.346) Pub Date : 2018-08-06
    Paul Joyce, Hanna Gustafsson, Clive A. Prestidge
  • Flexible electrochromic materials based on CNT/PDA hybrids
    Adv. Colloid Interface Sci. (IF 7.346) Pub Date : 2018-07-24
    Reinack Varghese Hansen, Jinglei Yang, Lianxi Zheng
  • Developments in support materials for immobilization of oxidoreductases: A comprehensive review
    Adv. Colloid Interface Sci. (IF 7.346) Pub Date : 2018-07-24
    Jakub Zdarta, Anne S. Meyer, Teofil Jesionowski, Manuel Pinelo
  • Mesoscopic characterization of amphiphilic monoglycerol monolayers
    Adv. Colloid Interface Sci. (IF 7.346) Pub Date : 2018-07-22
    D. Vollhardt

    The introduction of the highly-sensitive imaging technique Brewster angle microscopy (BAM) has given rise to new knowledges about the mesoscopic topology and ordering of condensed phase domains formed in the two-phase coexistence region of Langmuir monolayers. Besides fatty acids, monoalkanoylglycerols are the most studied amphiphiles at the air−water interface. In this review, the mesoscopic characterization of amphiphilic monoglycerol monolayers is surveyed to demonstrate the striking effect of the position of the glycerol backbone at which the polar head group is substituted. Systematic mesoscopic studies of amphiphilic monoglycerol monolayers offer an outstanding possibility to highlight the dramatic effect of chemical structure variations at the position of the glycerol backbone and the substituted polar groups on the basis of the mesoscopic characterization. Small changes in the polarity by slight variation in the head group structure can dramatic affect shape and organization of the condensed phase domains. According to the importance of the 1-substituted monoglycerols, the effect of the chemical structure of the substituted polar group is highlighted with 4 selected examples. Further main topics discussed are chiral discrimination, kinetics of non-equilibrium structures, electrostatic interactions and a new geometric concept for explaining the topology of condensed phase domains.

  • Nitrogen-doped graphene and graphene quantum dots: A review onsynthesis and applications in energy, sensors and environment
    Adv. Colloid Interface Sci. (IF 7.346) Pub Date : 2018-07-19
    Manpreet Kaur, Manmeet Kaur, Virender K. Sharma

    Doping of nitrogen is a promising strategy to modulate chemical, electronic, and structural functionalities of graphene (G)and graphene quantum dots (GQDs) for their outstanding properties in energy and environmental applications.This paper reviews various synthesis approaches of nitrogen-doped graphene (N-G) and nitrogen-doped graphene quantum dots (N-GQDs).;Thermal, ultrasonic, solvothermal, hydrothermal, and electron-beam methods have been applied to synthesize N-G and N-GQDs.These nitrogen-doped carbon materials are characterized to obtain their structural configurations in order to achieve better performance in their applications compared to only either graphene or graphene quantum dots.Both N-G and N-GQDs may be converted into functional materials by integrating with other compounds such as metal oxides/nitrides, polymers, and semiconductors.These functional materials demonstrate superior performance over N-G and N-GQDs materials.Examples of applications of N-G and N-GQDs include supercapacitors, batteries, sensors, fuel cells, solar cells, and photocatalyst.

  • Microrheology, advances in methods and insights
    Adv. Colloid Interface Sci. (IF 7.346) Pub Date : 2018-04-21
    Qiuyang Xia, Huining Xiao, Yuanfeng Pan, Lidong Wang

    Microrheology is an emerging technique that probes mechanical response of soft material at micro-scale. Generally, microrheology technique can be divided into active and passive versions. During last two decades, extensive efforts have been paid to improve both the experiment techniques and data analysis methods, especially about how to link consequential particle positions into trajectories. We review the recent advances in microrheology, including improvements in labeling, imaging, data acquiring, data processing and data interpretation. Some of the recent insights in soft matter and living systems gained by using this technique are given. Before these, we also give a very brief description of the basic principles of both active and passive microrheology techniques, and some details about optical particle tracking and DWS.

  • Wall slip for complex liquids – Phenomenon and its causes
    Adv. Colloid Interface Sci. (IF 7.346) Pub Date : 2018-06-15
    A. Ya Malkin, S.A. Patlazhan
  • Polyphenols at interfaces
    Adv. Colloid Interface Sci. (IF 7.346) Pub Date : 2018-06-07
    François Reitzer, Manon Allais, Vincent Ball, Florent Meyer
  • 更新日期:2018-07-12
  • PAMAM dendrimer - cell membrane interactions
    Adv. Colloid Interface Sci. (IF 7.346) Pub Date : 2018-06-27
    Laura J. Fox, Robert M. Richardson, Wuge H. Briscoe
  • Halloysite clay nanotubes for life sciences applications: From drug encapsulation to bioscaffold
    Adv. Colloid Interface Sci. (IF 7.346) Pub Date : 2018-05-31
    Ana C. Santos, Carolina Ferreira, Francisco Veiga, António J. Ribeiro, Abhishek Panchal, Yuri Lvov, Anshul Agarwal
  • 更新日期:2018-07-12
  • 更新日期:2018-07-12
  • Zeta potentials of the rare earth element fluorcarbonate minerals focusing on bastnäsite and parisite
    Adv. Colloid Interface Sci. (IF 7.346) Pub Date : 2018-04-20
    C.L. Owens, G.R. Nash, K. Hadler, R.S. Fitzpatrick, C.G. Anderson, F. Wall

    Rare earth elements (REE) are critical to a wide range of technologies ranging from mobile phones to wind turbines. Processing and extraction of REE minerals from ore bodies is, however, both challenging and relatively poorly understood, as the majority of deposits contain only limited enrichment of REEs. An improved understanding of the surface properties of the minerals is important in informing and optimising their processing, in particular for separation by froth flotation. The measurement of zeta potential can be used to extract information regarding the electrical double layer, and hence surface properties of these minerals. There are over 34 REE fluorcarbonate minerals currently identified, however bastnäsite, synchysite and parisite are of most economic importance. Bastnäsite–(Ce), the most common REE fluorcarbonate, supplies over 50% of the world's REE. Previous studies of bastnäsite have showed a wide range of surface behaviour, with the iso-electric point (IEP), being measured between pH values of 4.6 and 9.3. In contrast, no values of IEP have been reported for parisite or synchysite. In this work, we review previous studies of the zeta potentials of bastnäsite to investigate the effects of different methodologies and sample preparation. In addition, measurements of zeta potentials of parisite under water, collector and supernatant conditions were conducted, the first to be reported. These results showed an iso-electric point for parisite of 5.6 under water, with a shift to a more negative zeta potential with both collector (hydroxamic and fatty acids) and supernatant conditions. The IEP with collectors and supernatant was <3.5. As zeta potential measurements in the presence of reagents and supernatants are the most rigorous way of determining the efficiency of a flotation reagent, the agreement between parisite zeta potentials obtained here and previous work on bastnäsite suggests that parisite may be processed using similar reagent schemes to bastnäsite. This is important for future processing of REE deposits, comprising of more complex REE mineralogy.

  • Quantum dot-decorated semiconductor micro- and nanoparticles: A review of their synthesis, characterization and application in photocatalysis
    Adv. Colloid Interface Sci. (IF 7.346) Pub Date : 2018-02-20
    Beata Bajorowicz, Marek P. Kobylański, Anna Gołąbiewska, Joanna Nadolna, Adriana Zaleska-Medynska, Anna Malankowska
  • Phytochemical-assisted synthetic approaches for silver nanoparticles antimicrobial applications: A review
    Adv. Colloid Interface Sci. (IF 7.346) Pub Date : 2018-03-09
    Janardhan Reddy Koduru, Suresh Kumar Kailasa, Jigna R. Bhamore, Ki-Hyun Kim, Tanushree Dutta, Kowsalya Vellingiri
  • Emulsions in porous media: From single droplet behavior to applications for oil recovery
    Adv. Colloid Interface Sci. (IF 7.346) Pub Date : 2018-03-14
    Antonio Perazzo, Giovanna Tomaiuolo, Valentina Preziosi, Stefano Guido
  • A review on wetting and water condensation - Perspectives for CO2 condensation
    Adv. Colloid Interface Sci. (IF 7.346) Pub Date : 2018-03-29
    Ingrid Snustad, Ingeborg T Røe, Amy Brunsvold, Åsmund Ervik, Jianying He, Zhiliang Zhang
  • Liquid foam templating – A route to tailor-made polymer foams
    Adv. Colloid Interface Sci. (IF 7.346) Pub Date : 2018-04-03
    Sébastien Andrieux, Aggeliki Quell, Cosima Stubenrauch, Wiebke Drenckhan
  • Ball milling of eggshell waste as a green and sustainable approach: A review
    Adv. Colloid Interface Sci. (IF 7.346) Pub Date : 2018-04-17
    Matej Baláž

    Eggshell waste belongs to the most abundant natural waste in nature and is created in huge amounts by everyday consumption of eggs. The majority of this material is being discarded, despite the fact that it has multidisciplinary applications. In this review, the possibility of utilizing the method of ball milling to further broaden the application potential of this material is discussed. The particular application fields include the formation of nanophases, bioceramics synthesis, formation of composites and preparation of material with increased sorption ability. In addition, some other specific applications, like the utilization of ball-milled eggshell as a drug delivery agent, or for the formation of antibacterially active species, are also mentioned. The review provides a critical mechanochemical insight into this topic and aims to emphasize the green and sustainable way of utilizing eggshell waste by environmentally friendly method.

  • The application of atomic force microscopy in mineral flotation
    Adv. Colloid Interface Sci. (IF 7.346) Pub Date : 2018-02-06
    Yaowen Xing, Mengdi Xu, Xiahui Gui, Yijun Cao, Bent Babel, Martin Rudolph, Stefan Weber, Michael Kappl, Hans-Jürgen Butt
  • Adsorption of organic molecules on mineral surfaces studied by first-principle calculations: A review
    Adv. Colloid Interface Sci. (IF 7.346) Pub Date : 2018-04-09
    Hongxia Zhao, Yong Yang, Xin Shu, Yanwei Wang, Qianping Ran

    First-principle calculations, especially by the density functional theory (DFT) methods, are becoming a power technique to study molecular structure and properties of organic/inorganic interfaces. This review introduces some recent examples on the study of adsorption models of organic molecules or oligomers on mineral surfaces and interfacial properties obtained from first-principles calculations. The aim of this contribution is to inspire scientists to benefit from first-principle calculations and to apply the similar strategies when studying and tailoring interfacial properties at the atomistic scale, especially for those interested in the design and development of new molecules and new products.

  • A review of aqueous foam in microscale
    Adv. Colloid Interface Sci. (IF 7.346) Pub Date : 2018-05-01
    Abdolhamid Anazadehsayed, Nastaran Rezaee, Jamal Naser, Anh V. Nguyen

    In recent years, significant progress has been achieved in the study of aqueous foams. Having said this, a better understanding of foam physics requires a deeper and profound study of foam elements. This paper reviews the studies in the microscale of aqueous foams. The elements of aqueous foams are interior Plateau borders, exterior Plateau borders, nodes, and films. Furthermore, these elements' contribution to the drainage of foam and hydraulic resistance are studied. The Marangoni phenomena that can happen in aqueous foams are listed as Marangoni recirculation in the transition region, Marangoni-driven flow from Plateau border towards the film in the foam fractionation process, and Marangoni flow caused by exposure of foam containing photosurfactants under UV. Then, the flow analysis of combined elements of foam such as PB-film along with Marangoni flow and PB-node are studied. Next, we contrast the behavior of foams in different conditions. These various conditions can be perturbation in the foam structure caused by injected water droplets or waves or using a non-Newtonian fluid to make the foam. Further review is about the effect of oil droplets and particles on the characteristics of foam such as drainage, stability and interfacial mobility.

  • The development of a novel smart material based on colloidal microgels and cotton
    Adv. Colloid Interface Sci. (IF 7.346) Pub Date : 2018-04-22
    Natasa Majcen, Reham Mohsen, Martin J. Snowden, John C. Mitchell, Bojana Voncina

    Colloidal microgels are often described as “smart” due to their ability to undergo quite dramatic conformational changes in response to a change in their environmental conditions (e.g. temperature, pH). A range of novel smart materials were developed by the incorporation of colloidal microgels into cotton fabric. A series of microgels have been prepared by a surfactant free emulsion polymerization based on N-isopropylacrylamide (NIPAM) monomer. Poly(NIPAM) is a thermosensitive polymer which undergoes a conformational transition close to the human skin temperature. Poly(NIPAM) was co-polymerized acrylic acid (AA), to prepare pH/temperature-sensitive microgels. Microgel particles were characterized by scanning electron microscopy (SEM), attenuated total reflectance fourier transform infrared (ATR-FTIR) spectroscopy, and dynamic light scattering (DLS). This research aims at coupling microgel particles onto cotton fibers and comparing between different attachment techniques. The coupling reactions between microgels and cotton cellulose are only feasible if they both have appropriate functionalities. For microgels, this was achieved by using different initiators which introduce different functional groups on the particle surface and different surface charges. Cotton samples were successfully modified by carboxymethylation, periodate oxidation, grafting of 1,2,3,4-butanetetracarboxylic acid, and chloroacetylation in order to target possible reactions with the terminal functional groups of the microgel particles. Microgels were attached to the cotton fabrics using different methods and the bonds formed were determined by ATR-FTIR spectroscopy and SEM. The reaction yields were quantified gravimetrically and the maximum weight increase of cotton samples due to the attached microgels was around 24% (w/w).

  • The chemical (not mechanical) paradigm of thermodynamics of colloid and interface science
    Adv. Colloid Interface Sci. (IF 7.346) Pub Date : 2018-04-17
    George Kaptay

    In the most influential monograph on colloid and interfacial science by Adamson three fundamental equations of “physical chemistry of surfaces” are identified: the Laplace equation, the Kelvin equation and the Gibbs adsorption equation, with a mechanical definition of surface tension by Young as a starting point. Three of them (Young, Laplace and Kelvin) are called here the “mechanical paradigm”. In contrary it is shown here that there is only one fundamental equation of the thermodynamics of colloid and interface science and all the above (and other) equations of this field follow as its derivatives. This equation is due to chemical thermodynamics of Gibbs, called here the “chemical paradigm”, leading to the definition of surface tension and to 5 rows of equations (see Graphical abstract). The first row is the general equation for interfacial forces, leading to the Young equation, to the Bakker equation and to the Laplace equation, etc. Although the principally wrong extension of the Laplace equation formally leads to the Kelvin equation, using the chemical paradigm it becomes clear that the Kelvin equation is generally incorrect, although it provides right results in special cases. The second row of equations provides equilibrium shapes and positions of phases, including sessile drops of Young, crystals of Wulff, liquids in capillaries, etc. The third row of equations leads to the size-dependent equations of molar Gibbs energies of nano-phases and chemical potentials of their components; from here the corrected versions of the Kelvin equation and its derivatives (the Gibbs-Thomson equation and the Freundlich-Ostwald equation) are derived, including equations for more complex problems. The fourth row of equations is the nucleation theory of Gibbs, also contradicting the Kelvin equation. The fifth row of equations is the adsorption equation of Gibbs, and also the definition of the partial surface tension, leading to the Butler equation and to its derivatives, including the Langmuir equation and the Szyszkowski equation. Positioning the single fundamental equation of Gibbs into the thermodynamic origin of colloid and interface science leads to a coherent set of correct equations of this field. The same provides the chemical (not mechanical) foundation of the chemical (not mechanical) discipline of colloid and interface science.

  • Anisotropic surface chemistry properties and adsorption behavior of silicate mineral crystals
    Adv. Colloid Interface Sci. (IF 7.346) Pub Date : 2018-03-07
    Longhua Xu, Jia Tian, Houqin Wu, Shuai Fang, Zhongyuan Lu, Caifeng Ma, Wei Sun, Yuehua Hu
  • Current status and future developments in preparation and application of nonspherical polymer particles
    Adv. Colloid Interface Sci. (IF 7.346) Pub Date : 2018-04-20
    Bing Yu, Hailin Cong, Qiaohong Peng, Chuantao Gu, Qi Tang, Xiaodan Xu, Chao Tian, Feng Zhai

    Nonspherical polymer particles (NPPs) are nano/micro-particulates of macromolecules that are anisotropic in shape, and can be designed anisotropic in chemistry. Due to shape and surface anisotropies, NPPs bear many unique structures and fascinating properties which are distinctly different from those of spherical polymer particles (SPPs). In recent years, the research on NPPs has surprisingly blossomed in recent years, and many practical materials based on NPPs with potential applications in photonic device, material science and biomedical engineering have been generated. In this review, we give a systematic, balanced and comprehensive summary of the main aspects of NPPs related to their preparation and application, and propose perspectives for the future developments of NPPs.

  • Dopamine-assisted co-deposition: An emerging and promising strategy for surface modification
    Adv. Colloid Interface Sci. (IF 7.346) Pub Date : 2018-04-27
    Wen-Ze Qiu, Hao-Cheng Yang, Zhi-Kang Xu

    Mussel-inspired chemistry based on polydopamine (PDA) deposition has been developed as a facile and universal method for the surface modification of various materials. However, the inherent shortcomings of PDA coatings still impede their practical applications in the development of functional materials. In this review, we introduce the recent progress in the emerging dopamine-assisted co-deposition as a one-step strategy for functionalizing PDA-based coatings, and improving them in the aspects of deposition rate, morphology uniformity, surface wettability and chemical stability. The co-deposition mechanisms are categorized and discussed according to the interactions of dopamine or PDA with the introduced co-component. We also emphasize the influence of these interactions on the properties of the resultant PDA-based coatings. Meanwhile, we conclude the representative potential applications of those dopamine-assisted co-deposited coatings in material science, especially including separation membranes and biomaterials. Finally, some important issues and perspectives for theoretical study and applications are briefly discussed.

  • Engineered nanomaterials growth control by monomers and micelles: From surfactants to surface active polymers
    Adv. Colloid Interface Sci. (IF 7.346) Pub Date : 2018-04-27
    Mandeep Singh Bakshi

    In pseudo-micellar phase, the crystal growth is primarily achieved by the surface activity of the monomers in the presence of micelles. To ensure the maximum potential of surface activity of monomers in morphology control, a micellar phase is required. This account specifically focuses on the crystal growth control by the surface active monomers of conventional surfactants and that of water soluble polymers. It also distinguishes the mechanisms involved in the shape control driven by the micellar phase of micelle forming polymers, their role as nanoreactors, micellar stability, and micellar transitions from the monomeric phase. The fundamental basis of the crystal growth control by the surface active agents holds the key of using other non-convectional surface active species like proteins, carbohydrates, and bioactive polymers to achieve morphology control bionanomaterials for their specific biological applications.

  • Tears of wine: The dance of the droplets
    Adv. Colloid Interface Sci. (IF 7.346) Pub Date : 2018-05-05
    Alex Nikolov, Darsh Wasan, Jongju Lee
  • A comprehensive review on self-healing of asphalt materials: Mechanism, model, characterization and enhancement
    Adv. Colloid Interface Sci. (IF 7.346) Pub Date : 2018-05-09
    Daquan Sun, Guoqiang Sun, Xingyi Zhu, Alvaro Guarin, Bin Li, Ziwei Dai, Jianming Ling
  • 更新日期:2018-07-12
  • Drop “impact” on an airfoil surface
    Adv. Colloid Interface Sci. (IF 7.346) Pub Date : 2018-05-17
    Zhenlong Wu

    Drop impact on an airfoil surface takes place in drop-laden two-phase flow conditions such as rain and icing, which are encountered by wind turbines or airplanes. This phenomenon is characterized by complex nonlinear interactions that manifest rich flow physics and pose unique modeling challenges. In this article, the state of the art of the research about drop impact on airfoil surface in the natural drop-laden two-phase flow environment is presented. The potential flow physics, hazards, characteristic parameters, droplet trajectory calculation, drop impact dynamics and effects are discussed. The most key points in establishing the governing equations for a drop-laden flow lie in the modeling of raindrop splash and water film. The various factors affecting the drop impact dynamics and the effects of drop impact on airfoil aerodynamic performance are summarized. Finally, the principle challenges and future research directions in the field as well as some promising measures to deal with the adverse effects of drop-laden flows on airfoil performance are proposed.

  • Growth of wormlike micelles in nonionic surfactant solutions: Quantitative theory vs. experiment
    Adv. Colloid Interface Sci. (IF 7.346) Pub Date : 2018-05-18
    Krassimir D. Danov, Peter A. Kralchevsky, Simeon D. Stoyanov, Joanne L. Cook, Ian P. Stott, Eddie G. Pelan

    Despite the considerable advances of molecular-thermodynamic theory of micelle growth, agreement between theory and experiment has been achieved only in isolated cases. A general theory that can provide self-consistent quantitative description of the growth of wormlike micelles in mixed surfactant solutions, including the experimentally observed high peaks in viscosity and aggregation number, is still missing. As a step toward the creation of such theory, here we consider the simplest system – nonionic wormlike surfactant micelles from polyoxyethylene alkyl ethers, CiEj. Our goal is to construct a molecular-thermodynamic model that is in agreement with the available experimental data. For this goal, we systematized data for the micelle mean mass aggregation number, from which the micelle growth parameter was determined at various temperatures. None of the available models can give a quantitative description of these data. We constructed a new model, which is based on theoretical expressions for the interfacial-tension, headgroup-steric and chain-conformation components of micelle free energy, along with appropriate expressions for the parameters of the model, including their temperature and curvature dependencies. Special attention was paid to the surfactant chain-conformation free energy, for which a new more general formula was derived. As a result, relatively simple theoretical expressions are obtained. All parameters that enter these expressions are known, which facilitates the theoretical modeling of micelle growth for various nonionic surfactants in excellent agreement with the experiment. The constructed model can serve as a basis that can be further upgraded to obtain quantitative description of micelle growth in more complicated systems, including binary and ternary mixtures of nonionic, ionic and zwitterionic surfactants, which determines the viscosity and stability of various formulations in personal-care and house-hold detergency.

  • 更新日期:2018-07-12
  • Interactions between surfactants and the skin – Theory and practice
    Adv. Colloid Interface Sci. (IF 7.346) Pub Date : 2018-04-13
    Artur Seweryn

    One of the primary causes of skin irritation is the use of body wash cosmetics and household chemicals, since they are in direct contact with the skin, and they are widely available and frequently used. The main ingredients of products of this type are surfactants, which may have diverse effects on the skin. The skin irritation potential of surfactants is determined by their chemical and physical properties resulting from their structure, and specific interactions with the skin. Surfactants are capable of interacting both with proteins and lipids in the stratum corneum. By penetrating through this layer, surfactants are also able to affect living cells in deeper regions of the skin. Further skin penetration may result in damage to cell membranes and structural components of keratinocytes, releasing proinflammatory mediators. By causing irreversible changes in cell structure, surfactants can often lead to their death. The paper presents a critical review of literature on the effects of surfactants on the skin. Aspects discussed in the paper include the skin irritation potential of surfactants, mechanisms underlying interactions between compounds of this type and the skin which have been proposed over the years, and verified methods of reducing the skin irritation potential of surfactant compounds. Basic research conducted in this field over many years translate into practical applications of surfactants in the cosmetic and household chemical industries. This aspect is also emphasized in the present study.

  • Interfacial tensiometry and dilational surface visco-elasticity of biological liquids in medicine
    Adv. Colloid Interface Sci. (IF 7.346) Pub Date : 2017-08-10
    V.B. Fainerman, D.V. Trukhin, Igor I. Zinkovych, R. Miller

    Dynamic surface tensions and dilational visco-elasticity are easy accessible parameters of liquids. For human body liquids, such as urine, blood serum, amniotic fluid, gastric juice, saliva and others, these parameters are very characteristic for the health status of people. In case of a disease the composition of certain liquids specifically changes and the measured characteristics of dynamic surface tension of the dilational surface elasticity and viscosity reflect these changes in a clear way. Thus, this kind of physico-chemical measurements represent sensitive tools for evaluating the severity of a disease and can serve as control tool for the efficiency of applied therapies. The overview summarises the results of a successful work over about 25 years on this subject and gives specific insight into a number of diseases for which the diagnostics as well as the therapy control have been significantly improved by the application of physico-chemical experimental techniques.

  • Auxiliary soft beam for the amplification of the elasto-capillary coiling: Towards stretchable electronics
    Adv. Colloid Interface Sci. (IF 7.346) Pub Date : 2017-09-18
    Paul Grandgeorge, Arnaud Antkowiak, Sébastien Neukirch

    A flexible fiber carrying a liquid drop may coil inside the drop thereby creating a drop-on-fiber system with an ultra-extensible behavior. During compression, the excess fiber is spooled inside the droplet and capillary forces keep the system taut. During subsequent elongation, the fiber is gradually released and if a large number of spools is uncoiled a high stretchability is achieved. This mechanical behaviour is of interest for stretchable connectors but information, may it be electronic or photonic, usually travels through stiff functional materials. These high Young's moduli, leading to large bending rigidity, prevent in-drop coiling. Here we overcome this limitation by attaching a beam of soft elastomer to the functional fiber, thereby creating a composite system which exhibits in-drop coiling and carries information while being ultra-extensible. We present a simple model to explain the underlying mechanics of the addition of the soft beam and we show how it favors in-drop coiling. We illustrate the method with a two-centimeter long micronic PEDOT:PSS conductive fiber joined to a PVS soft beam, showing that the system conveys electricity throughout a 1900% elongation.

  • A fast and accurate Langmuir-type polymer microtensiometer
    Adv. Colloid Interface Sci. (IF 7.346) Pub Date : 2017-09-05
    Pieter Gijsenbergh, Robert Puers

    A semi-flexible polymer microtensiometer for local surface pressure measurements of Langmuir monolayers is presented. The current device geometry and read-out method via image analysis result in a theoretical accuracy of ±0.02 mN⋅m− 1 for a dynamic range between 0 and 75 mN⋅m− 1. The tensiometer sensitivity and dynamic range are easily tunable as they are solely based on the tensiometer spring dimensions. Finite element simulations are used to determine the response time of 20 ms for a subphase viscosity of 1 mPa⋅s. A poroviscomechanical model of the sensor is composed and the subphase viscosity is shown to dominate the transient behavior. The tensiometer performance is verified in a Langmuir trough by applying rapid local surface pressure oscillations. A Wilhelmy plate is used as an independent measurement tool and the results of both techniques correlate well.

  • On the extent of surface stagnation produced jointly by insoluble surfactant and thermocapillary flow
    Adv. Colloid Interface Sci. (IF 7.346) Pub Date : 2017-09-15
    Andrey Shmyrov, Aleksey Mizev, Vitaly Demin, Maxim Petukhov, Dmitry Bratsun

    We consider the effect of a partially contaminated interface on the steady thermocapillary flow developed in a two-dimensional slot of finite extent. The contamination is due to the presence of an insoluble surfactant which is carried away by the flow and forms a region of stagnant surface. This problem, first studied in the classical theoretical paper by Carpenter and Homsy (1985, J. Fluid Mech. 155, 429), is revisited thanks to new experimental data. We show that there is a qualitative agreement between above theory and our experiments: two different regions simultaneously coexist on the surface, one of which is free from surfactant and subject to vigorous Marangoni flow, while the other is stagnant and subject to creeping flow with the surface velocity smaller about two orders of magnitude. We found, however, significant disagreement between theory predictions for the extent of a stagnant surface region and newly obtained experimental data. In this paper, we provide an explanation for this discrepancy demonstrating that the surface temperature distribution is far from suggested earlier. Another effect, not previously taken into account, is a possible phase transition experienced by the surfactant. We obtain a correct analytic solution for the position of the edge of the stagnation zone and compare it with the experimental data.

  • Metal losses in pyrometallurgical operations - A review
    Adv. Colloid Interface Sci. (IF 7.346) Pub Date : 2017-08-10
    Inge Bellemans, Evelien De Wilde, Nele Moelans, Kim Verbeken

    Nowadays, a higher demand on a lot of metals exists, but the quantity and purity of the ores decreases. The amount of scrap, on the other hand, increases and thus, recycling becomes more important. Besides recycling, it is also necessary to improve and optimize existing processes in extractive and recycling metallurgy. One of the main difficulties of the overall-plant recovery are metal losses in slags, in both primary and secondary metal production. In general, an increased understanding of the fundamental mechanisms governing these losses could help further improve production efficiencies. This review aims to summarize and evaluate the current scientific knowledge concerning metal losses and pinpoints the knowledge gaps.First, the industrial importance and impact of metal losses in slags will be illustrated by several examples from both ferrous and non-ferrous industries. Throughout the remainder of this review, the main focus will be put on the particular issues in copper industry. In a second section, the different types of metal losses in slags will be discussed. Generally, metal losses in slags can be subdivided into two types: chemical losses and physical losses. The fundamental insights concerning the responsible mechanisms will be discussed for each type. Subsequently, an overview of the most frequently used techniques for research investigations of the losses will be given. In a fourth section, a more detailed overview will be given on the post-processing treatment of metal-containing slags, i.e. performing slag cleaning operations. The most frequently applied methods will be discussed.

  • Viscous dynamics of drops and bubbles in Hele-Shaw cells: Drainage, drag friction, coalescence, and bursting
    Adv. Colloid Interface Sci. (IF 7.346) Pub Date : 2017-07-22
    Ko Okumura

    In this review article, we discuss recent studies on drops and bubbles in Hele-Shaw cells, focusing on how scaling laws exhibit crossovers from the three-dimensional counterparts and focusing on topics in which viscosity plays an important role. By virtue of progresses in analytical theory and high-speed imaging, dynamics of drops and bubbles have actively been studied with the aid of scaling arguments. However, compared with three-dimensional problems, studies on the corresponding problems in Hele-Shaw cells are still limited. This review demonstrates that the effect of confinement in the Hele-Shaw cell introduces new physics allowing different scaling regimes to appear. For this purpose, we discuss various examples that are potentially important for industrial applications handling drops and bubbles in confined spaces by showing agreement between experiments and scaling theories. As a result, this review provides a collection of problems in hydrodynamics that may be analytically solved or that may be worth studying numerically in the near future.

  • Surface tension- and buoyancy-driven flows across horizontally propagating chemical fronts
    Adv. Colloid Interface Sci. (IF 7.346) Pub Date : 2017-07-20
    R. Tiani, A. De Wit, L. Rongy

    Chemical reactions can interplay with hydrodynamic flows to generate various complex phenomena. Because of their relevance in many research areas, chemically-induced hydrodynamic flows have attracted increasing attention in the last decades. In this context, we propose to give a review of the past and recent theoretical and experimental works which have considered the interaction of such flows with chemical fronts, i.e. reactive interfaces, formed between miscible solutions. We focus in particular on the influence of surface tension- (Marangoni) and buoyancy-driven flows on the dynamics of chemical fronts propagating horizontally in the gravity field.

  • Magnetocapillary self-assemblies: Locomotion and micromanipulation along a liquid interface
    Adv. Colloid Interface Sci. (IF 7.346) Pub Date : 2017-07-20
    G. Grosjean, M. Hubert, N. Vandewalle

    This paper presents an overview and discussion of magnetocapillary self-assemblies. New results are presented, in particular concerning the possible development of future applications. These self-organizing structures possess the notable ability to move along an interface when powered by an oscillatory, uniform magnetic field. The system is constructed as follows. Soft magnetic particles are placed on a liquid interface, and submitted to a magnetic induction field. An attractive force due to the curvature of the interface around the particles competes with an interaction between magnetic dipoles. Ordered structures can spontaneously emerge from these conditions. Furthermore, time-dependent magnetic fields can produce a wide range of dynamic behaviours, including non-time-reversible deformation sequences that produce translational motion at low Reynolds number. In other words, due to a spontaneous breaking of time-reversal symmetry, the assembly can turn into a surface microswimmer. Trajectories have been shown to be precisely controllable. As a consequence, this system offers a way to produce microrobots able to perform different tasks. This is illustrated in this paper by the capture, transport and release of a floating cargo, and the controlled mixing of fluids at low Reynolds number.

  • Transport velocity of droplets on ratchet conveyors
    Adv. Colloid Interface Sci. (IF 7.346) Pub Date : 2017-09-14
    Hal R. Holmes, Karl F. Böhringer

    Anisotropic ratchet conveyors (ARC) are a type of digital microfluidic system. Unlike electrowetting based systems, ARCs transport droplets through a passive, micro-patterned surface and applied orthogonal vibrations. The mechanics of droplet transport on ARC devices has yet to be as well characterized and understood as on electrowetting systems. In this work, we investigate how the design of the ARC substrate affects the droplet response to vibrations and perform the first characterization of transport velocity on ARC devices. We discovered that the design of the ARC device has a significant effect on both the transport efficiency and velocity of actuated droplets, and that the amplitude of the applied vibration can modulate the velocity of transported droplets. Finally, we show that the movement of droplet edges is not continuous but rather the sum of quantized steps between features of the ARC device. These results provide new insights into the behavior of droplets vibrated on asymmetric surface patterns and will serve as the foundation for the design and development of future lab-on-a-chip systems.

  • 更新日期:2018-06-03
  • Mechanisms of pattern formation from dried sessile drops
    Adv. Colloid Interface Sci. (IF 7.346) Pub Date : 2018-03-24
    Maryam Parsa, Souad Harmand, Khellil Sefiane
Some contents have been Reproduced with permission of the American Chemical Society.
Some contents have been Reproduced by permission of The Royal Society of Chemistry.
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