Download or read book Homopolymer Adsorption at Solid liquid Interfaces written by Jessy Simon Haddad and published by . This book was released on 2004 with total page 110 pages. Available in PDF, EPUB and Kindle. Book excerpt: Understanding the interfacial organization of polymers with excluded volume inte ractions near solid surfaces is an issue of fundamental interest that is relevan t for many technological and biological applications. In this work, we address s everal questions pertaining to the adsorption- desorption phase behavior of a ho mopolymer chain interacting with a solid surface and to the adsorption- desorpti on point for finite and infinite chains. Our analysis is based on a self- consis tent field approximation using the lattice model. We employ different extrapolation methods to alleviate diffic ulties, which arise when considering very long chains, and eventually discuss th e results for infinite chains. One of our interesting findings is that homopolymers may undergo an adsorption- desorption transition in the vicinity of the surface of the second order contrar y to some other predictions. Finally we discuss the dependence of the critical p oint on the quality of the solvent.

Download or read book Adsorption Studies of Linear and Cyclic Homopolymers at the Solid liquid Interface written by T. G. Heath and published by . This book was released on 1989 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Regular and Random Copolymer Adsorption at Solid liquid Interfaces written by Edward Hovsep Maraachlian and published by . This book was released on 2002 with total page 134 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this thesis the adsorption of copolymers at liquid interfaces is studied. General background on the subject is given. Then two different models, the continuum and lattice, are introduced. The two models are compared and the lattice model is chosen in order to do further calculations. The random and regular copolymers that we used were made up of two types of monomers type A and type B. Type B monomers are assumed not to interact with the wall and only the A-type monomers interact. The matrix method was used in order to calculate the critical energies and adsorption layer thickness. It was observed that the critical energies of random copolymers are less than the critical energies of regular copolymers of the same composition. The values of the critical energies were close to the one predicted by the mean energy model for large values of the fraction of A-type monomers.--The numerical results are compare to analytic predictions. The mean energy model was used to find the energy of attraction of the wall at which a homopolymer will be equivalent to a regular or random copolymer whose A-type monomers interact with the wall by energy EA. We compared our results to these predictions and determined the range applicability of this model. In general the agreement was good only for concentrations of A monomers greater than a certain value. Regular and random copolymers, in the region of strong adsorption, showed differences in the structure of the adsorbed layer.

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 Proteins at Solid Liquid Interfaces written by Philippe Déjardin and published by Springer Science & Business Media. This book was released on 2006-09-28 with total page 341 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book opens with a description of fundamental aspects of protein adsorption to surfaces, a phenomenon that plays a key role in biotechnological applications, especially at solid-liquid interfaces. Presented here are methods for studying adsorption kinetics and conformational changes such as optical waveguide lightmode spectroscopy (OWLS). Also described are sensitive bench techniques for measuring the orientation and structure of proteins at solid-liquid interfaces, including total internal reflection ellipsometry (TIRE), dual polarisation interferometry (DPI) and time of flight - secondary ion mass spectrometry (TOF–SIMS). A model study of fibronectin at polymer surfaces is included, as are studies using microporous membranes and textiles with immobilized enzymes for large-scale applications. Biocompatibility, anti-fouling properties and surface modification to modulate the adsorption and activity of biomolecules are among the other topics addressed in this invaluable book.

Download or read book Adsorption From Solution written by R. H. Ottewill and published by Elsevier. This book was released on 2012-12-02 with total page 330 pages. Available in PDF, EPUB and Kindle. Book excerpt: Adsorption From Solution discusses the significance of adsorption behavior in thermodynamic terms, with emphasis on the interplay between enthalpic and entropic contributions to the free energy. This book examines the role of simple models and of elementary thermodynamic and statistical mechanical arguments in relation to the concept of surface phase. Organized into 22 chapters, this book starts with an overview of the theoretical model for the solid/liquid interface. This text then proceeds with a discussion of the general thermodynamic treatment of adsorption from mixed solvents, which is designed to apply in situations where adsorbed species may be regarded as distinct from their bulk counterparts. Other chapters discuss the adsorption from solutions of various interfaces of liquid/gas, liquid/liquid, or liquid/solid. The final chapter deals with the roles of adsorption from solution in controlling other phenomena, such as liquid–liquid displacement, wetting, and the forces between colloidal particles. Physicists, chemists, and materials scientists will find this book extremely useful.

Download or read book Adsorption at the Gas Solid and Liquid Solid Interface written by Kenneth Sing and published by Elsevier. This book was released on 2009-06-04 with total page 525 pages. Available in PDF, EPUB and Kindle. Book excerpt: Adsorption at the Gas-Solid and Liquid-Solid Interface

Download or read book Adsorption from Solution at the Solid liquid Interface written by G. D. Parfitt and published by . This book was released on 1983 with total page 444 pages. Available in PDF, EPUB and Kindle. Book excerpt: Non-electrolytes. Adsorption of small molecules. Adsorption from mixtures of miscible liquids. Adsorption of nonionic surfactants. Adsorption of polymers. Electrolytes. Adsorption of small ions. Adsorption of ionic surfactants. Adsorption of dyes. Adsorption of polyelectrolytes from dilute solution.

Download or read book Block Copolymer Adsorption at the Solid liquid Interface written by Mark R. Munch and published by . This book was released on 1989 with total page 312 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Adsorption of Polymers at the Solid liquid Interface written by Martin Malmsten and published by . This book was released on 1992 with total page 70 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Flexible Polymers at a Solid liquid Interface written by Martien A. Cohen Stuart and published by . This book was released on 1980 with total page 151 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 Dynamics of Adsorption at Liquid Interfaces written by S.S. Dukhin and published by Elsevier. This book was released on 1995-04-11 with total page 601 pages. Available in PDF, EPUB and Kindle. Book excerpt: As the first of its kind, this book provides a valuable introduction for scientists and engineers interested in liquid/fluid interfaces and disperse systems to the rapidly developing area of adsorption dynamics. It is the first extensive review available on the subject of dynamics of adsorption and gives a general summary of the current state of adsorption kinetics theory and experiments. Current progress in recently designed set-ups and improved and generalised known methods for studying interfacial relaxations is reviewed. In addition, the role of the electric charge of surfactants in the adsorption process is discussed in terms of a non-equilibrium distribution of adsorbing ions in the diffuse layer.Present theories of the effect of dynamic adsorption layers on mobile surfaces, such as moving drops and bubbles, based on both diffusion and kinetic controlled adsorption models are described and efficient approximate analytical methods to solve the mathematical problem of coupling surfactant transport and hydrodynamics are introduced. The role of a dynamic adsorption layer in bubble rising, film drainage and film stabilisation and in complex processes such as flotation and microflotation is discussed.Containing more than 1100 references, the book is essential reading for industrial scientists and graduate and post-graduate students in physical, surface and colloid chemistry, physico-chemical hydrodynamics, water purification and mineral processing.

Download or read book Adsorption at Solid liquid Interfaces Studied with Surfaces Sensitive Techniques written by Lei Wang and published by . This book was released on 2016 with total page 146 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Adsorption and Grafting of Polyelectrolytes at Solid Liquid Interfaces written by Nikolay Houbenov and published by . This book was released on 2005 with total page 290 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Encyclopedia of Surface and Colloid Science written by P. Somasundaran and published by CRC Press. This book was released on 2006 with total page 1152 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Physical Adsorption at Solid liquid Interfaces written by Rameshbhai Manibhai Patel and published by . This book was released on 1970 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: