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Advances in Colloid and Interface Science

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https://www.readbyqxmd.com/read/28939013/on-the-extent-of-surface-stagnation-produced-jointly-by-insoluble-surfactant-and-thermocapillary-flow
#1
REVIEW
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...
September 15, 2017: Advances in Colloid and Interface Science
https://www.readbyqxmd.com/read/28927830/transport-velocity-of-droplets-on-ratchet-conveyors
#2
REVIEW
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...
September 14, 2017: Advances in Colloid and Interface Science
https://www.readbyqxmd.com/read/28935100/a-critical-review-on-the-prospect-of-polyaniline-grafted-biodegradable-nanocomposite
#3
REVIEW
Mohammad Shahadat, Mohammad Zain Khan, Parveen Fatemeh Rupani, Asha Embrandiri, Saima Sultana, Shaikh Ziauddin Ahammad, S Wazed Ali, T R Sreekrishnan
Among the various electrically conducting polymers, polyaniline (PANI) has gained attentions due to its unique properties and doping chemistry. A number of electrically conducting biodegradable polymers has been synthesized by incorporating a biodegradable content of cellulose, chitin, chitosan, etc. in the matrix of PANI. The hybrid materials are also employed as photocatalysts, antibacterial agents, sensors, fuel cells and as materials in biomedical applications. Furthermore, these biodegradable and biocompatible conducting polymers are employed in tissue engineering, dental implants and targeted drug delivery...
September 6, 2017: Advances in Colloid and Interface Science
https://www.readbyqxmd.com/read/28916110/a-fast-and-accurate-langmuir-type-polymer-microtensiometer
#4
REVIEW
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 ±0.02mN⋅m(-1) for a dynamic range between 0 and 75mN⋅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 20ms for a subphase viscosity of 1mPa⋅s...
September 5, 2017: Advances in Colloid and Interface Science
https://www.readbyqxmd.com/read/28916111/icosahedral-plant-viral-nanoparticles-bioinspired-synthesis-of-nanomaterials-nanostructures
#5
REVIEW
Kannan Badri Narayanan, Sung Soo Han
Viral nanotechnology utilizes virus nanoparticles (VNPs) and virus-like nanoparticles (VLPs) of plant viruses as highly versatile platforms for materials synthesis and molecular entrapment that can be used in the nanotechnological fields, such as in next-generation nanoelectronics, nanocatalysis, biosensing and optics, and biomedical applications, such as for targeting, therapeutic delivery, and non-invasive in vivo imaging with high specificity and selectivity. In particular, plant virus capsids provide biotemplates for the production of novel nanostructured materials with organic/inorganic moieties incorporated in a very precise and controlled manner...
August 31, 2017: Advances in Colloid and Interface Science
https://www.readbyqxmd.com/read/28923702/zinc-oxide-nanoparticles-synthesis-antiseptic-activity-and-toxicity-mechanism
#6
REVIEW
A Król, P Pomastowski, K Rafińska, V Railean-Plugaru, B Buszewski
Zinc oxide (ZnO), as a material with attractive properties, has attracted great interest worldwide, particularly owing to the implementation of the synthesis of nano-sized particles. High luminescent efficiency, a wide band gap (3.36eV), and a large exciton binding energy (60meV) has triggered intense research on the production of nanoparticles using different synthesis methods and on their future applications. ZnO nanomaterials can be used in industry as nano-optical and nano-electrical devices, in food packaging and in medicine as antimicrobial and antitumor agents...
August 26, 2017: Advances in Colloid and Interface Science
https://www.readbyqxmd.com/read/28919372/biological-applications-of-kinetics-of-wetting-and-spreading
#7
REVIEW
G Ahmed, O Arjmandi Tash, J Cook, A Trybala, V Starov
Wetting and spreading kinetics of biological fluids has gained a substantial interest recently. The importance of these fluids in our lives has driven the pace of publications. Globally scientists have ever growing interest in understanding wetting phenomena due to its vast applications in biological fluids. It is impractical to review extremely large number of publications in the field of kinetics of complex biological fluids and cosmetic solutions on diverse surfaces. Therefore, biological and cosmetic applications of wetting and spreading dynamics are considered in the following areas: (i) Spreading of Newtonian liquids in the case of non-porous and porous substrates...
August 18, 2017: Advances in Colloid and Interface Science
https://www.readbyqxmd.com/read/28842122/malonic-acid-based-cationic-lipids-the-way-to-highly-efficient-dna-carriers
#8
REVIEW
Christian Wölk, Christopher Janich, Udo Bakowsky, Andreas Langner, Gerald Brezesinski
Cationic lipids play an important role as non-viral nucleic acid carriers in gene therapy since 3 decades. This review will introduce malonic acid derived cationic lipids as nucleic acid carriers which appeared in the literature dealing with lipofection 10years ago. The family of amino-functionalized branched fatty acid amides will be presented as well as different generations of malonic acid diamides. Both groups of cationic lipids yield lipid mixtures with highly efficient nucleic acid transfer activities in in-vitro cell culture models...
August 13, 2017: Advances in Colloid and Interface Science
https://www.readbyqxmd.com/read/28851489/interfacial-tensiometry-and-dilational-surface-visco-elasticity-of-biological-liquids-in-medicine
#9
REVIEW
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...
August 10, 2017: Advances in Colloid and Interface Science
https://www.readbyqxmd.com/read/28826814/metal-losses-in-pyrometallurgical-operations-a-review
#10
REVIEW
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...
August 10, 2017: Advances in Colloid and Interface Science
https://www.readbyqxmd.com/read/28803628/dominique-langevin-festschrift-four-decades-opening-gates-in-colloid-and-interface-science
#11
EDITORIAL
(no author information available yet)
No abstract text is available yet for this article.
August 5, 2017: Advances in Colloid and Interface Science
https://www.readbyqxmd.com/read/28821347/stable-oil-laden-foams-formation-and-evolution
#12
REVIEW
Rémy Mensire, Elise Lorenceau
The interaction between oil and foam has been the subject of various studies. Indeed, oil can be an efficient defoaming agent, which can be highly valuable in various industrial applications where undesired foaming may occur, as seen in jet-dyeing processes or waste water treatment plant. However, oil and foam can also constructively interact as observed in detergency, fire-fighting, food and petroleum industries, where oil can be in the foam structure or put into contact with the foam without observing a catastrophic break-up of the foam...
August 2, 2017: Advances in Colloid and Interface Science
https://www.readbyqxmd.com/read/28800974/advances-in-the-synthesis-molecular-architectures-and-potential-applications-of-gemini-surfactants
#13
REVIEW
Renu Sharma, Ajar Kamal, Maryam Abdinejad, Rakesh Kumar Mahajan, Heinz-Bernhard Kraatz
Gemini surfactants have been the subject of intensive scrutiny by virtue of their unique combination of physical and chemical properties and being used in ordinary household objects to multifarious industrial processes. In this review, we summarize the recent developments of gemini surfactants, highlighting the classification of gemini surfactants based on the variation in headgroup polarity, flexibility/rigidity of spacer, hydrophobic alkyl chain and counterion along with potential applications of gemini surfactants, depicting the truly remarkable journey of gemini surfactants that has just come of age...
July 29, 2017: Advances in Colloid and Interface Science
https://www.readbyqxmd.com/read/28780963/effect-of-contact-angle-and-contact-angle-hysteresis-on-the-floatability-of-spheres-at-the-air-water-interface
#14
REVIEW
Dong-Xia Feng, Anh V Nguyen
The floatability of solid particles on the water surface governs many natural phenomena and industrial processes including film flotation and froth flotation separation of coal and valuable minerals. For many years, the contact angle (CA) has been postulated as the key factor in determining the particle floatability. Indeed, the maximum force (tenacity) supporting the flotation of fine spheres was conjectured to occur when the apical angle of the contact circle is equal to the contact angle. In this paper, the model predictions are reviewed and compared with experimental results...
July 28, 2017: Advances in Colloid and Interface Science
https://www.readbyqxmd.com/read/28807368/membrane-interactions-and-antimicrobial-effects-of-inorganic-nanoparticles
#15
REVIEW
Sara Malekkhaiat Häffner, Martin Malmsten
Interactions between nanoparticles and biological membranes are attracting increasing attention in current nanomedicine, and play a key role both for nanotoxicology and for utilizing nanomaterials in diagnostics, drug delivery, functional biomaterials, as well as combinations of these, e.g., in theranostics. In addition, there is considerable current interest in the use of nanomaterials as antimicrobial agents, motivated by increasing resistance development against conventional antibiotics. Here, various nanomaterials offer opportunities for triggered functionalites to combat challenging infections...
July 27, 2017: Advances in Colloid and Interface Science
https://www.readbyqxmd.com/read/28780961/natural-and-bioinspired-nanostructured-bactericidal-surfaces
#16
REVIEW
Abinash Tripathy, Prosenjit Sen, Bo Su, Wuge H Briscoe
Bacterial antibiotic resistance is becoming more widespread due to excessive use of antibiotics in healthcare and agriculture. At the same time the development of new antibiotics has effectively ground to a hold. Chemical modifications of material surfaces have poor long-term performance in preventing bacterial build-up and hence approaches for realising bactericidal action through physical surface topography have become increasingly important in recent years. The complex nature of the bacteria cell wall interactions with nanostructured surfaces represents many challenges while the design of nanostructured bactericidal surfaces is considered...
July 27, 2017: Advances in Colloid and Interface Science
https://www.readbyqxmd.com/read/28760412/interfacial-tension-of-reactive-liquid-interfaces-and-its-consequences
#17
REVIEW
Anaïs Giustiniani, Wiebke Drenckhan, Christophe Poulard
Dispersions of immiscible liquids, such as emulsions and polymer blends, are at the core of many industrial applications which makes the understanding of their properties (morphology, stability, etc.) of great interest. A wide range of these properties depend on interfacial phenomena, whose understanding is therefore of particular importance. The behaviour of interfacial tension in emulsions and polymer blends is well-understood - both theoretically and experimentally - in the case of non-reactive stabilization processes using pre-made surfactants...
July 24, 2017: Advances in Colloid and Interface Science
https://www.readbyqxmd.com/read/28821348/viscous-dynamics-of-drops-and-bubbles-in-hele-shaw-cells-drainage-drag-friction-coalescence-and-bursting
#18
REVIEW
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...
July 22, 2017: Advances in Colloid and Interface Science
https://www.readbyqxmd.com/read/28764854/probing-foam-with-neutrons
#19
REVIEW
Alesya Mikhailovskaya, Li Zhang, Fabrice Cousin, François Boué, Pavel Yazhgur, François Muller, Cyprien Gay, Anniina Salonen
Foams are multiscale materials that have an enormous number of uses. As the relevant structural length-scales span from a few nanometres up to millimetres a number of characterisation methods need to be combined to obtain the full material structure. In this review we explain how foams can be explored using Small Angle Neutron Scattering (SANS). We remind the reader of the basics of SANS and contrast variation before we describe the different types of experiments that have been carried out on foams emphasising the specific role of neutrons in learning about the systems...
July 22, 2017: Advances in Colloid and Interface Science
https://www.readbyqxmd.com/read/28780962/applicability-of-the-gibbs-adsorption-isotherm-to-the-analysis-of-experimental-surface-tension-data-for-ionic-and-nonionic-surfactants
#20
REVIEW
L Martínez-Balbuena, Araceli Arteaga-Jiménez, Ernesto Hernández-Zapata, César Márquez-Beltrán
The Gibbs Adsorption Isotherm equation is a two-dimensional analogous of the Gibbs-Duhem equation, and it is one of the cornerstones of interface science. It is also widely used to estimate the surface excess concentration (SEC) for surfactants and other compounds in aqueous solution, from surface tension measurements. However, in recent publications some authors have cast doubt on this method. In the present work, we review some of the best available surface tension experimental data, and compare estimations of the SEC, using the Gibbs isotherm method (GIM), to direct measurements reported in the literature...
July 21, 2017: Advances in Colloid and Interface Science
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