Download or read book Adsorption Mechanisms of Charged Polymeric Surfactants to the Solid water Interface written by Ryan G. Toomey and published by . This book was released on 2002 with total page 432 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Polymer Vs Surfactant written by B. R. Postmus and published by . This book was released on 2008 with total page 143 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Interactions of Surfactants with Polymers and Proteins written by E. Desmond Goddard and published by CRC Press. This book was released on 2018-01-18 with total page 567 pages. Available in PDF, EPUB and Kindle. Book excerpt: Interactions of Surfactants with Polymers and Proteins covers work done in this area over the last 30 years and examines in detail the physico-chemical, microstructural, and applications aspects of interactions of surfactants with polymers and proteins in bulk surfaces and at interfaces. The physical chemistry of individual components (surfactants, polymers, and proteins) is discussed, and extensive coverage of interactions of surfactants with uncharged, oppositely charged, and hydrophobe modified polymers is provided. Other topics addressed include water soluble and insoluble keratinous proteins, the principles and applications of fluorescence spectroscopy, the physical properties and microstructural aspects of polymer/protein-surfactant complexes, and implications of surfactant interactions with polymers and proteins in practical systems. Interactions of Surfactants with Polymers and Proteins provides a wealth of information for chemists involved in a number of different research areas, including cosmetics, pharmaceutics, foods, paints, pigments, lubrication, ceramics, minerals/materials processing, and biological systems.

Download or read book Fluid Interfaces written by Eduardo Guzmán and published by MDPI. This book was released on 2021-03-02 with total page 232 pages. Available in PDF, EPUB and Kindle. Book excerpt: Fluid interfaces are promising candidates for confining different types of materials, e.g., polymers, surfactants, colloids, and even small molecules, to be used in designing new functional materials with reduced dimensionality. The development of such materials requires a deepening of the physicochemical bases underlying the formation of layers at fluid interfaces as well as on the characterization of their structures and properties. This is of particular importance because the constraints associated with the assembly of materials at the interface lead to the emergence of equilibrium and features of dynamics in the interfacial systems, which are far removed from those conventionally found in traditional materials. This Special Issue is devoted to studies on the fundamental and applied aspects of fluid interfaces, and attempts to provide a comprehensive perspective on the current status of the research field.

Download or read book Adsorption Kinetics of Polymer written by Anna Angus-Smyth and published by . This book was released on 2013 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The dynamic adsorption mechanisms of a range of polymer/surfactant mixtures have been studied at the expanding air/water interface created by an overflowing cylinder. The composition of the adsorption layer from mixed systems is obtained using a new approach, co-modelling ellipsometry data and NR data recorded on only one isotopic contrast, without deuterated polymer. The precision and accuracy of the interfacial compositions using this novel approach match those obtained by NR measurements using multiple isotopic contrasts and deuterated polymer, and exceeds those in the absence of deuterated polymer. For weakly interacting PEO/surfactant mixtures adsorption is competitive, the interfacial composition can be rationalised in terms of competitive adsorption. At high surfactant concentrations polymer adsorption is inhibited by the increasing surfactant coverage, although in PEO/SDS mixtures positive interactions between the two components allow PEO to adsorb until an SDS monolayer is present. For oppositely charged mixtures of PSS and CnTAB surfactants, synergistic adsorption occurs at low surfactant concentrations, and the formation of polymer/surfactant complexes has a marked effect on interfacial adsorption, although polymer adsorption is controlled by free polymer molecules. Aggregation occurs around charge neutrality, the material in these aggregates cannot reach the interface due to their size, and at higher surfactant concentrations polymer can no longer adsorb. Mixtures of PEI/SDS at high pH behave similarly to the PSS/CnTAB systems, with progressive aggregation depleting the system of surface active material and limiting adsorption. However at low pH the aggregates can reach the interface by convection where they spread material across the surface in the form of a thin layer of nanometer thickness by Marangoni flows. This work proves that examination of the dynamic adsorption behaviour of polymer/surfactant systems is invaluable to understanding their adsorption mechanisms. Furthermore there is a clear and incontrovertible link between the dynamic interfacial adsorption and bulk phase behaviour.

Download or read book Adsorption and Aggregation of Surfactants in Solution written by K.L. Mittal and published by CRC Press. This book was released on 2002-11-07 with total page 656 pages. Available in PDF, EPUB and Kindle. Book excerpt: Offering the latest research and developments in the understanding of surfactant behavior in solutions, this reference investigates the role and dynamics of surfactants and their solution properties in the formulation of paints, printing inks, paper coatings, pharmaceuticals, personal care products, cosmetics, liquid detergents, and lubricants. Exploring the science behind techniques from oil recovery to drug delivery, the book covers surfactant stabilized particles; solid particles at liquid interfaces; nanocapsules; aggregation behavior of surfactants; micellar catalysis; vesicles and liposomes; the clouding phenomena; viscoelasticity of micellar solutions; and more.

Download or read book Adsorption Kinetics of Polymer surfactant Mixtures at an Expanding Air water Interface written by Anna Angus-Smyth and published by . This book was released on 2013 with total page 252 pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract:The dynamic adsorption mechanisms of a range of polymer/surfactant mixtures have been studied at the expanding air/water interface created by an overflowing cylinder. The composition of the adsorption layer from mixed systems is obtained using a new approach, co-modelling ellipsometry data and NR data recorded on only one isotopic contrast, without deuterated polymer. The precision and accuracy of the interfacial compositions using this novel approach match those obtained by NR measurements using multiple isotopic contrasts and deuterated polymer, and exceeds those in the absence of deuterated polymer. For weakly interacting PEO/surfactant mixtures adsorption is competitive, the interfacial composition can be rationalised in terms of competitive adsorption. At high surfactant concentrations polymer adsorption is inhibited by the increasing surfactant coverage, although in PEO/SDS mixtures positive interactions between the two components allow PEO to adsorb until an SDS monolayer is present. For oppositely charged mixtures of PSS and CnTAB surfactants, synergistic adsorption occurs at low surfactant concentrations, and the formation of polymer/surfactant complexes has a marked effect on interfacial adsorption, although polymer adsorption is controlled by free polymer molecules. Aggregation occurs around charge neutrality, the material in these aggregates cannot reach the interface due to their size, and at higher surfactant concentrations polymer can no longer adsorb. Mixtures of PEI/SDS at high pH behave similarly to the PSS/CnTAB systems, with progressive aggregation depleting the system of surface active material and limiting adsorption. However at low pH the aggregates can reach the interface by convection where they spread material across the surface in the form of a thin layer of nanometer thickness by Marangoni flows. This work proves that examination of the dynamic adsorption behaviour of polymer/surfactant systems is invaluable to understanding their adsorption mechanisms. Furthermore there is a clear and incontrovertible link between the dynamic interfacial adsorption and bulk phase behaviour.

Download or read book Bijels written by Paul S Clegg and published by Royal Society of Chemistry. This book was released on 2020-03-27 with total page 266 pages. Available in PDF, EPUB and Kindle. Book excerpt: Bicontinuous interfacially jammed emulsion gels, now commonly termed 'bijels', are a class of soft materials, in which interpenetrating, continuous domains of two immiscible fluids are maintained in a rigid arrangement by a jammed layer of colloidal particles at their interface. Such gels have unusual material properties that promise exciting applications across diverse fields from energy materials and catalysis, to food science. This is the first book on the subject and provides the reader with a fundamental introduction. Edited by a recognised authority on bijels, the reader will learn about the bijel and its formation. Bringing together current understanding, this book aims to bring the potential application of bijels to diverse materials challenges closer to fruition. This is a must-have resource for anyone working in soft matter and applied fields.

Download or read book Adsorption of Polymers and Surfactants from Solution Onto the Solid liquid Interface written by Alexander Couzis and published by . This book was released on 1992 with total page 302 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Understanding the Adsorption at Solid Liquid Interface and Its Consequences on Interfacial Phenomena written by Nishad Dhopatkar and published by . This book was released on 2017 with total page 168 pages. Available in PDF, EPUB and Kindle. Book excerpt: Physical adsorption at solid-liquid interface is an effective way to dynamically alter the surface properties text/italics{in-situ} and is prevalent in biology, geoscience, biotechnology, catalysis, food processing, agriculture, textiles, coatings, adhesives and lubricants, and cosmetics Over the last century an extensive framework of the thermodynamics and kinetics of adsorption as well as the intermolecular forces that govern the physical interactions between the substrate, solute, and solvent has been established, helping elucidate the structure of adsorbates. However, there lacks an understanding of the connection between the local conformation of the adsorbed molecules and its influence on the macroscopic interfacial phenomena. In this research we have employed vibrational spectroscopy techniques namely the interface-selective non-linear sum frequency generation (SFG) and linear attenuated total reflectance Fourier transform infrared (ATR-FTIR) in conjugation with contact mechanics to develop the molecular level insights into macroscopic phenomena of wetting, adhesion, and sliding friction. We study the interfacial structure of small molecules (surfactants and solvents) as well as macromolecules adsorbed on model surfaces of sapphire (aluminum oxide) and silicone dioxide. Using SFG, we discovered a strongly coordinated ice-like water layer confined between two charged surfaces, under hydration pressures, formed by the adsorption of a cationic surfactant (cetyl trimethyl ammonium bromide, CTAB) on dissimilar hydrophobic surfaces (phenylethyl trichlorosilane, PETS self-assembled monolayer, and polydimethylsiloxane elastomer, PDMS). This strongly coordinated water structure forms past the surfactant concentration needed for a monolayer surface coverage and is observed to reduce the sliding friction. Correlating interface-selective spectroscopy with hydration forces, and their macroscopic manifestation on adhesion and friction requires us to reconsider how we understand water under confinement and its significance in more complicated interfacial processes prevalent in biology, chemistry, and engineering. To investigate the adsorption of a basic polymer (PMMA) on acidic surfaces in carbon tetrachloride (neutral), Chloroform (acidic), and acetone (basic) solvents, we used SFG and ATR-FTIR to build on to the established concept of acid-base interactions that explains limited adsorption from basic and acidic solutions compared to neutral solution due to competitive interactions. We show that besides the differences in adsorbed amount, chains adsorbed from an acidic solvent adopt a flat conformation with a much smaller ratio of segments of loops and tails to trains compared to those adsorbed from a neutral solvent. Surface interaction parameters alone cannot predict the differences in conformation of chains adsorbed from acidic or neutral solvents. Such differences in the static and dynamic conformations have consequences in understanding the exchange kinetics, colloidal stabilization, chromatographic separations, adhesion and friction, and stabilization of nanocomposites. The adsorption of polyelectrolytes driven by Coulombic interactions becomes complicated when mixed with oppositely charged surfactant which modulates the net charge and solubility of polyelectrolytes in water resulting in a characteristic bulk phase diagram. We have investigated the adsorption from pre-mixed solutions of a cationic polysaccharide (PQ10) and the anionic surfactant sodium dodecyl sulfate (SDS), on an amphoteric alumina surface using quartz crystal microbalance with dissipation (QCMD). By tuning the surface charge of the amphoteric alumina, we confirmed the importance of electrostatic interactions on the adsorption on a hydrophilic charged surface, a suggestion that was made earlier solely based on the measurements on negatively charged surfaces. We also directly correlate the bulk phase transitions at the interface adsorption by observing a maximum extent of adsorption on both negatively and positively charged surfaces from a solution corresponding to the maximum turbidity. Using the Voight based viscoelastic model, QCMD also provided information on the viscosity, shear modulus, and thickness of the adsorbed polymeric complex, findings of which were corroborated by underwater atomic force microscopy (AFM) measurements. Shifting gears from adsorption to understanding the polymer thin films surface structure in different environments, we used SFG to observe the surface restructuring of an amphiphilic glassy homopolymer poly(alpha-hydroxy-n-butyl acrylate, PHNB) from hydrophobic to aqueous environment. We observed relative changes in ordering of hydrophobic and hydroxyl pendant groups upon going from air to water at different temperatures showing their impact on wetting of the polymer surface observed by means of dynamic contact angles measurement.

Download or read book Principles of Adsorption and Adsorption Processes written by Douglas M. Ruthven and published by John Wiley & Sons. This book was released on 1984-06-05 with total page 466 pages. Available in PDF, EPUB and Kindle. Book excerpt: The first up-to-date summary and review for the fundamental principles and industrial practice of adsorption separation processes in more than 30 years. Emphasizes the understanding of adsorption column dynamics and the modeling of adsorption systems, as well as fundamental aspects of kinetics and equilibria.

Download or read book Mineral Surfactant Interaction for Minimum Reagents Precipitation and Adsorption for Improved Oil Recovery written by P. Somasundaran and published by . This book was released on 2006 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: In this project, fundamental studies were conducted to understand the mechanisms of the interactions between polymers/surfactants and minerals with the aim of minimizing chemical loss by adsorption. The effects of structures of the surface active molecules on critical solid/liquid interfacial properties such as adsorption, wettability and surface tension in mineral/surfactant systems were investigated. The final aim is to build a guideline to design optimal polymer/surfactant formula based on the understanding of adsorption and orientation of surfactants and their aggregates at solid/liquid interfaces. During this period, the wettability of alumina was tested using two-phase extraction at different pHs. The results were explained using the adsorption data obtain previously. It was found that the wettability is determined by both the nano-structure of the hemimicelles and the surface coverage. It was found that pH plays a critical role in controlling the total adsorption and the mineral wettability. At pH 4, the alumina surface remains hydrophilic in the surfactant concentration range tested because of the low surface coverage, even though hemimicelles are formed. Adsorption of sodium dodecyl sulfate (SDS) on alumina and silica, the component minerals reservoir rocks, was conducted at different pHs. The adsorption of SDS on silica is negligible, while the adsorption on alumina is high due to the different charge of the latter. Tests of adsorption of a modified polymer S-19703-35HT on alumina were also conducted at different pHs. Adsorption density decreases with pH. The results suggest that alkaline pH range is more cost-effective for a SDS/polymer system because of the low adsorption density. A new term, reagent loss index (RLI), was used to analyze the adsorption data for different surfactants and minerals. It was shown that the chemical loss is very high in the case of SDS on gypsum and limestone, while it is low in the case of silica. The mixed Dodecyl maltoside (DM)/C12SO3Na system was also evaluated using this standard term. It is fairly easy to find the optimal conditions, including mixing ratio and pH, for minimum chemical loss using polymer/surfactant mixtures.

Download or read book Handbook of Detergents 6 Volume Set written by Uri Zoller and published by CRC Press. This book was released on 2008-11-23 with total page 4002 pages. Available in PDF, EPUB and Kindle. Book excerpt: With contributions from experts and pioneers, this set provides readers with the tools they need to answer the need for sustainable development faced by the industry. The six volumes constitute a shift from the traditional, mostly theoretical focus of most resources to the practical application of advances in research and development. With con

Download or read book Dissertation Abstracts International written by and published by . This book was released on 2008 with total page 906 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Surfactants in Tribology written by Girma Biresaw and published by CRC Press. This book was released on 2014-11-21 with total page 538 pages. Available in PDF, EPUB and Kindle. Book excerpt: Surface science and tribology play very critical roles in many industries. Manufacture and use of almost all consumer and industrial products rely on the application of advanced surface and tribological knowledge. The fourth in a series, Surfactants in Tribology, Volume 4 provides an update on research and development activities connecting surfactants and tribological phenomena. Written by renowned subject matter experts, the book demonstrates how improved design of surfactants can be harnessed to control tribological phenomena. Profusely illustrated and copiously referenced, the chapters also discuss novel approaches to control tribological phenomena using surfactants including green surfactants. It also discusses the underlying tribological and surface science issues relevant to many situations in diverse industries. The information in this volume provides a cutting-edge reference connecting the fields of surfactants and tribology as a way forward to novel, enhanced methods of controlling lubrication, friction, and wear. It reflects the latest developments, highlighting the relevance of surfactants in tribological phenomena in a broad range of industries. As we learn more about the connection between surfactants and tribology, new and improved ways to control lubrication, friction, and wear utilizing surfactants will emerge. This book takes us farther on the path towards this goal.

Download or read book Surfactants in Tribology Volume 5 written by Girma Biresaw and published by CRC Press. This book was released on 2017-09-11 with total page 516 pages. Available in PDF, EPUB and Kindle. Book excerpt: Surfactants play a critical role in Tribology controlling friction, wear, and lubricant properties such as emulsification, demulsification, bioresistance, oxidation resistance, rust prevention and corrosion resistance. This is a critical topic for new materials and devices particularly those built at the nanoscale. This newest volume will address tribological properties of cutting fluids, lubricant performance related to steel surfaces, biolubricants, and novel materials and ways to reduce friction and wear. Scientists from industrial research and development (R&D) organizations and academic research teams in Asia, Europe, the Middle East and North America will participate in the work.

Download or read book Polymer Interfaces and Emulsions written by Kunio Esumi and published by CRC Press. This book was released on 2020-08-13 with total page 588 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Presents the latest knowledge on a wide range of topics in polymer science, including the dynamics, preparation, application, and physiochemical properties of polymer solutions and colloids; the adsorption characteristics at polymer surfaces; and the adhesion properties (including acid-base) of polymer surfaces."