Theoretical and Experimental Investigation of the Equilibrium and Dynamic Interfacial Behavior of Mixed Surfactant Solutions PDF Download
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Author: Michael Patrick Mulqueen Publisher: ISBN: Category : Languages : en Pages : 339
Book Description
(Cont.) (i) repulsive, steric interactions, which were modeled using a hard-disk treatment, and (ii) attractive, van der Waals interactions, which were modeled using a virial expansion, truncated to second order in surfactant surface concentration. Since both the hard-disk size and the second-order virial coefficients characterizing these interactions can be deduced from the known molecular structures of the surfactants, this surface equation of state contains no experimentally determined parameters. This nonionic surface equation of state was subsequently modified to incorporate electrostatic effects associated with charged surfactants. For mixtures that contain only a single ionic surfactant species, the electrostatic contribution to the surface equation of state was computed using a Gouy-Chapman based approach, which also included a Stern layer of counterion exclusion. This electrostatic description assumes that all of the electrostatic charge on the adsorbed surfactant molecules is located on a single two-dimensional charge layer. The Gouy-Chapman model was then extended to mixtures that contain multiple ionic surfactants, or surfactants that contain multiple charged groups (such as zwitterionic surfactants) by treating the case of multiple, two-dimensional charge layers at the interface. This extended theoretical framework is capable of treating any number of surfactant components containing any number of charged groups ...
Author: Michael Patrick Mulqueen Publisher: ISBN: Category : Languages : en Pages : 339
Book Description
(Cont.) (i) repulsive, steric interactions, which were modeled using a hard-disk treatment, and (ii) attractive, van der Waals interactions, which were modeled using a virial expansion, truncated to second order in surfactant surface concentration. Since both the hard-disk size and the second-order virial coefficients characterizing these interactions can be deduced from the known molecular structures of the surfactants, this surface equation of state contains no experimentally determined parameters. This nonionic surface equation of state was subsequently modified to incorporate electrostatic effects associated with charged surfactants. For mixtures that contain only a single ionic surfactant species, the electrostatic contribution to the surface equation of state was computed using a Gouy-Chapman based approach, which also included a Stern layer of counterion exclusion. This electrostatic description assumes that all of the electrostatic charge on the adsorbed surfactant molecules is located on a single two-dimensional charge layer. The Gouy-Chapman model was then extended to mixtures that contain multiple ionic surfactants, or surfactants that contain multiple charged groups (such as zwitterionic surfactants) by treating the case of multiple, two-dimensional charge layers at the interface. This extended theoretical framework is capable of treating any number of surfactant components containing any number of charged groups ...
Author: Clarence A. Miller Publisher: CRC Press ISBN: 1420044435 Category : Science Languages : en Pages : 524
Book Description
Since the publication of the first edition of Interfacial Phenomena, the interest in interfaces and surfactants has multiplied, along with their applications. Experimental and theoretical advances have provided scientists with greater insight into the structure, properties, and behavior of surfactant and colloid systems. Emphasizing equil
Author: Masahiko Abe Publisher: CRC Press ISBN: 1420031015 Category : Science Languages : en Pages : 818
Book Description
Completely revised and expanded throughout, Mixed Surfactant Systems, Second Edition surveys the latest results, newest experimental perspectives, and theoretical investigations of properties, behavior, and techniques applicable to mixed surfactant systems. This important book elucidates core theoretical notions while summarizing results of
Author: Publisher: ISBN: Category : Languages : en Pages : 112
Book Description
This work presents the importance of surface characteristics and its modification by surfactants during any process involving two phases. The change in the wetting characteristics of water by addition of surfactants has been investigated by experimental measurements of static, advancing and receding contact angles of aqueous surfactant solutions. These measurements have been carried out for a wide range of concentrations, from zero (pure water) to twice Critical Micellar Concentration (CMC) for anionic (SDS and SLES), cationic (CTAB, Ethoquad O/12, Ethoquad 18/25) and non-ionic (Triton X-100 and Triton X-305) surfactant solutions. Other means of characterizing the wettability change like spreading coefficient and adhesion tension have also been investigated. For ionic surfactants, the effect of charge on the polar head of the surfactant molecule has been investigated with the help of another important interfacial parameter called the zeta-potential or the electro-kinetic potential. The correlation between zeta-potential and wettability, both resulting from the adsorption of surfactant species onto the surface of the substrate is presented. The surfactant adsorption characteristics have been investigated under equilibrium conditions. Experimental equilibrium surface tension measurements have been carried out using Maximum Bubble Pressure Method. The differences in adsorption characteristics of ionic and non-ionic surfactants have been discussed. To facilitate comparison of different surfactants having different physical and chemical properties on common grounds, the experimental equilibrium surface tension data have been fitted with theoretically derived adsorption isotherms. The resulting curve fit parameters called the equilibrium adsorption parameters given by the Langmuir (and a) and Frumkin (, a and K) adsorption isotherms provide a quantitative means of comparing surfactant adsorption activity. Lastly, the time dependent nature of surfactant adsorption has been investigated. Experimental dynamic surface tension measurements were carried out and the dynamic adsorption parameters (D and d) have been calculated to examine the time dependent surface tension relaxation resulting from diffusion controlled surfactant adsorption. The short and long time approximations of the Ward and Tordai equation were fit to the experimental data. The surface tension relaxation time scales obtained were used to compare the activity of the surfactants.
Author: D. Möbius Publisher: Elsevier ISBN: 0080542131 Category : Science Languages : en Pages : 679
Book Description
This publication provides comprehensive material on the chemical and physical attributes of surfactants and new models for the understanding of structure-property relationships. Surfactants Chemistry, Interfacial Properties, Applications provides efficient instruments for the prognostication of principal physicochemical properties and the technologic applicability from the structure of a surfactant through the discussion of interrelations between the chemical structure, physicochemical properties and the efficiency of technologic application. Also included are informative overviews on new experimental techniques and abundant reference material on manufacturers, nomenclature, product properties, and experimental examples. The publication is accompanied by a CD-ROM, which is needed for the application of the thermodynamic and kinetic models to experimental data.
Author: K. L. Mittal Publisher: ISBN: Category : Solution (Chemistry) Languages : en Pages : 830
Book Description
This symposium represented the third event in the series of symposia dealing with the topic of surfactants in solution. In this symposium a number of ramifications of surfactants were covered. It should be added that both aggregation and adsorption of surfactants were covered, and the applications of surfactants were given due cognizance. A number of speakers were specifically asked to provide state-of-the-art overviews of certain topics and those were augmented by unpuvlished original research contributions.
Author: Richard B. Ross Publisher: John Wiley & Sons ISBN: 047019166X Category : Science Languages : en Pages : 300
Book Description
This book stems from the American Chemical Society symposium, Large Scale Molecular Dynamics, Nanoscale, and Mesoscale Modeling and Simulation: Bridging the Gap, that delved into the latest methodologies and applications for largescale, multiscale, and mesoscale modeling and simulation. It presents real-world applications of simulated and synthesized materials, including organic-, inorganic-, bio-, and nanomaterials, and helps readers determine the best method for their simulation. It gets novices up to speed quickly and helps experienced practitioners discover novel approaches and alternatives.
Author: Paul M. Holland Publisher: ISBN: Category : Language Arts & Disciplines Languages : en Pages : 472
Book Description
Presents a broad survey of the properties, behavior, and modeling of mixed surfactant systems, including mixed micellar solutions, phenomena at interfaces, phase behavior, and mixtures with unusual surfactant types. Covers chemical reactions in mixed micelles, approaches to molecular modeling of mixed surfactant aggregates, and new experimental techniques for studying mixed micelles and adsorption on surfaces. Features contributions from leading specialists in colloid and surface science, including Robert S. Schechter, John F. Scamehorn, Milton J. Rosen, Keizo Ogino, and Denver G. Hall.
Author: Michael Patrick Mulqueen
Author: Michael Patrick Mulqueen
Author: Clarence A. Miller
Author: Masahiko Abe
Author: 
Author: D. Möbius
Author: K. L. Mittal
Author: 
Author: Richard B. Ross
Author: Paul M. Holland
Author: Sudhakar Puvvada