Download or read book Molecular thermodynamic Theories of Micellization of Multicomponent Surfactant Mixtures and of PH sensitive Surfactants written by Arthur Clayton Goldsipe and published by . This book was released on 2006 with total page 264 pages. Available in PDF, EPUB and Kindle. Book excerpt: (Cont.) A simpler theory based on RST was also developed to model titrations of micelles containing pH-sensitive and conventional surfactants. In addition, this thesis resulted in the rst experimental study of the eect of micelle composition on the titration behavior of mixed micelles containing a pH-sensitive surfactant and a conventional surfactant. The resulting MT theories have provided fundamental, physical insight, and they may also decrease the need for the costly and time-consuming process associated with "trial-and-error" surfactant formulation.
Download or read book Surfactant Science and Technology written by Laurence S. Romsted and published by CRC Press. This book was released on 2014-05-05 with total page 580 pages. Available in PDF, EPUB and Kindle. Book excerpt: Surfactant research explores the forces responsible for surfactant assembly and the critical industrial, medical, and personal applications, including viscosity control, microelectronics, drug stabilization, drug delivery, cosmetics, enhanced oil recovery, and foods. Surfactant Science and Technology: Retrospects and Prospects, "a Festschrift in ho
Download or read book Micellar Enhanced Ultrafiltration written by Sirshendu De and published by CRC Press. This book was released on 2012-06-04 with total page 227 pages. Available in PDF, EPUB and Kindle. Book excerpt: A response to increasingly stringent regulation of pollution and toxicity levels in industrial waste discharge, Micellar Enhanced Ultrafiltration: Fundamentals & Applications offers the most complete book available on the benefits and use of micellar-enhanced ultrafiltration (MEUF) to achieve continuous removal of organic and inorganic pollutants. An Unparalleled Book That Addresses Both Academic and Industrial Points of View Several membrane-based techniques, such as microfiltration, ultrafiltration, nanofiltration, and reverse osmosis, are currently used in a wide range of applications throughout the textile, pulp and paper, sugar, chemical, pharmaceutical, biomedical, biotechnological, and food industries. However, although reverse osmosis is an effective means of removing contaminants, this book explains why MEUF is a better substitute, as it less expensive, less energy-intensive, and more efficient and practical for a wider range of applications. Topics covered include: Effects of pollution in water and its consequences Various treatment processes and membrane technologies Fundamentals of ultrafiltration Outline of various membrane modules and modeling approaches Principles of colloid chemistry Theories of micelle formation Stability and dynamics of micelles Phenomena of counterion binding Solubilization of organic pollutants Selection criteria for surfactants Various flux enhancement techniques Recovery of precious metals This book conveys how, with proper selection of surfactant and membrane, MEUF can be used to efficiently remove almost all metal ions (heavy metals, lanthanides, radioactive materials, etc.) with reasonably high efficiency and throughput. It also details the MEUF process for removal of inorganic (cations, anions, and their mixture) and organic pollutants. The authors explain how the economy of the overall process makes recovery and reuse of surfactants essential, and they address various influencing factors on the increase in throughput and the resulting operating problems. Elaborating on technologies involving precipitation and other methods, they also illustrate additional potential applications for MEUF technology.
Download or read book Modeling the Micellization Behavior of Fluorosurfactants Using Molecular thermodynamic Theory written by Jaisree Kannan Iyer and published by . This book was released on 2013 with total page 281 pages. Available in PDF, EPUB and Kindle. Book excerpt: Fluorinated surfactants are an important class of surfactants because they possess properties that are far superior than those of their hydrocarbon analogs. As a result, they are used in a wide variety of applications including in paints, polishes, fire-fighting foams, and emulsion polymerization processes. However, concerns regarding the non-biodegradability and toxicity of fluorinated surfactants have prompted the search for new, benign alternative surfactant formulations that possess micellization properties comparable to those of traditional fluorinated surfactants. With this need in mind, this thesis focuses on gaining a molecular-level understanding of the micellization behavior of traditional fluorinated surfactants, and then using the acquired knowledge to design novel surfactant formulations that can reduce the use of fluorinated surfactants. Molecular-thermodynamic (MT) models were developed to calculate the various contributions to the free energy of micellization for discoidal and biaxial ellipsoidal micelles; two important micelle shapes in the context of fluorocarbon-based surfactants. These models explicitly incorporate the effect of the position-dependent curvature associated with discs and biaxial ellipsoids. Comparison between the models developed here with those that do not explicitly account for the varying curvature shows that accounting for the position-dependent curvature is extremely important in modeling these two micelle shapes. The new MT model for the free energy of micellization is also used to demonstrate the feasibility of realizing biaxial ellipsoidal micelles, a result refuted in the past in many theoretical studies on the basis of average geometrical properties of the micelle. A new computer-simulation-molecular-thermodynamic (CSMT) framework was developed to predict the micellization behavior of mixtures of fluorocarbon-based surfactants. To facilitate the practical implementation of the mixture CSMT framework, which involves the computationally intensive task of simulating several mixed micelles, an approximation to the mixture CSMT model was developed. In this approximation, relevant properties for a mixed micelle are estimated using a micelle-composition based weighted average of the analogous properties obtained from simulations of the single-component surfactant micelles for each of the surfactants comprising the mixture. Therefore, in this approximation, the need for simulating mixed micelles is eliminated. The approximation was found to compare well with the mixture CSMT model for various binary surfactant mixtures considered, except for those containing alkyl ethoxylate surfactants. A rationalization of this finding is presented. CMC predictions made using the mixture CSMT model were found to compare very well with the experimental CMCs for several binary mixtures of linear surfactants, thereby laying the foundation for using the CSMT model to predict micellization properties of mixtures of surfactants that have a more complex chemical architecture. Finally, an MT framework was also developed to predict the micellization properties of mixtures of fluorocarbon-based and hydrocarbon-based surfactants. This mixing reduces the use of fluorinated surfactants in the surfactant formulation, thereby addressing the non-biodegradability and toxicity concerns associated with fluorinated surfactants. An enthalpy of mixing contribution resulting from the interactions between the fluorocarbon tails and the hydrocarbon tails, estimated using the Regular Solution Theory, was included in the MT framework. The ability of the MT framework to predict the coexistence of two types of mixed micelles in solution was demonstrated. The MT framework predictions of micelle population distributions, CMCs, and optimal micelle compositions were compared with the experimental values for various mixtures of fluorocarbon-based and hydrocarbon-based surfactants. The models developed in this thesis provide a molecular level understanding of the micellization behavior of fluorocarbon-based surfactants and their mixtures. The models are able to predict several important micellization properties of surfactants and their mixtures that can guide surfactant formulators in the synthesis, characterization, design, and optimization of surfactant formulations that exhibit desirable properties.
Download or read book Thermodynamics Phase Behavior and Rheology of Surfactant Mixtures written by Hongda Zhang and published by . This book was released on 1998 with total page 692 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Dissertation Abstracts International written by and published by . This book was released on 2008 with total page 902 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Mixed Surfactant Systems written by Keizo Ogino and published by CRC Press. This book was released on 1992-12-22 with total page 472 pages. Available in PDF, EPUB and Kindle. Book excerpt: This work describes the solubility, solution properties, thermodynamics, miscibility, solubilization, mesomorphic character and other physical properties of mixed surfactant systems - presenting both theoretical analysis and a wide range of practical applications. Equations clarify complex and abstract constructs.;The book also: treats mixed critical micelle concentrations, surface tension, flotation and absorption in terms of thermodynamic models; explores the miscibility of fluorocarbon and hydrocarbon surfactants in the micelles, covering micelle formation, liquid-liquid solubility and thermodynamics of mixed micellization; determines the mean aggregation number by steady-state quenching methods, and analyzes the composition of mixed micelles; discusses the mechanisms and experimental studies of adsorption from mixed surfactant systems; examines surface activity of surfactant mixtures, mixing phenomena and liquid crystal phase behaviour; and reviews means of investigation that use ion-specific electrodes, light scattering, and NMR and flourescence probing.
Download or read book Organized Solutions written by Stig Friberg and published by CRC Press. This book was released on 1992-07-21 with total page 418 pages. Available in PDF, EPUB and Kindle. Book excerpt: Written by top international experts in colloid and surface chemistry. Contains close to 750 literature references and nearly 400 useful figures, equations and tables.
Download or read book Mixed Surfactant Systems written by Paul M. Holland and published by . This book was released on 1992 with total page 472 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Download or read book Solution Chemistry of Surfactants written by K. L. Mittal and published by . This book was released on 1979 with total page 472 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 Solution Behavior of Surfactants written by K.L. Mittal and published by Springer. This book was released on 1982-09-30 with total page 782 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Structure performance Relationships in Surfactants written by Milton J. Rosen and published by . This book was released on 1984 with total page 376 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Aqueous Phase Behavior of Surfactants written by Robert G. Laughlin and published by . This book was released on 1994 with total page 588 pages. Available in PDF, EPUB and Kindle. Book excerpt: Intended for graduates and researchers in academia and industry working on surfactant science and technology, this book presents basic principles governing phase behaviour of surfactants, the relationship between phase behaviour and molecular structure, and ways this information can be applied.
Download or read book Surfactants in Solution written by K.L. Mittal and published by Springer. This book was released on 1999-02-25 with total page 772 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Complementary Use of Computer Simulations and Molecular thermodynamic Theory to Model Surfactant and Solubilizate Self assembly written by Brian Curtis Stephenson and published by . This book was released on 2007 with total page 769 pages. Available in PDF, EPUB and Kindle. Book excerpt: (cont.) This thesis presents a detailed, atomistic-level computer simulation and molecular-thermodynamic investigation of the micellar solution behavior of nonionic, zwitterionic, and ionic surfactants in aqueous solutions, as well as of the aqueous micellar solubilization of solubilizates by surfactants. It is hoped that the approaches developed in this thesis to use computer simulations and molecular-thermodynamic theory in a complementary way will not only extend our ability to make accurate predictions of surfactant solution behavior, but will also contribute to our fundamental knowledge of the solution behavior of surfactants and solubilizates. It is further hoped that this thesis will provide a solid foundation for future research in the area of surfactant science, and, more generally, that it will assist future researchers working to connect atomistic-level computer simulation methods with continuum thermodynamic models.
Download or read book Chemistry and Technology of Surfactants written by Richard J. Farn and published by Wiley-Blackwell. This book was released on 2008-04-15 with total page 336 pages. Available in PDF, EPUB and Kindle. Book excerpt: Surfactants are used throughout industry as components in a huge range of formulated products or as effect chemicals in the production or processing of other materials. A detailed understanding of the basis of their activity is required by all those who use surfactants, yet the new graduate or postgraduate chemist or chemical engineer will generally have little or no experience of how and why surfactants work. Chemistry & Technology of Surfactants is aimed at new graduate or postgraduate level chemists and chemical engineers at the beginning their industrial careers and those in later life who become involved with surfactants for the first time. The book is a straightforward and practical survey of the chemistry of surfactants and their uses, providing a basic introduction to surfactant theory, information on the various types of surfactant and some application details. This will allow readers to build onto their scientific education the concepts and principles on which the successful use of surfactants, across a wide range of industries, is based.
