Download or read book Surface and micellar properties of some aqueous binary anionic cationic surfactant systems written by Zheng-Gang Cui and published by . This book was released on 1995 with total page 63 pages. Available in PDF, EPUB and Kindle. Book excerpt: L’ultrafiltration micellaire constitue une technique d’épuration des effluents aqueux efficace et peu coûteuse en énergie. Avec le choix de la membrane et celui des conditions hydrodynamiques, la sélection de l’agent tensio-actif ou du mélange conduisant aux meilleures propriétés de solubilisation, donc à la rétention maximale des solutés, est un des paramètres critiques du procédé. Les mélanges de tensio-actifs possèdent souvent des propriétés intéressantes et avantageuses par rapport à celles de leurs constituants purs : des effets de synergie se manifestent notamment dans l’abaissement de la tension superficielle et de la diminution de la concentration micellaire critique (cmc). Toutefois, le pouvoir solubilisant des micelles mixtes, loin d’être systématiquement supérieur à celui des micelles pures, montre des variations parfois complexes. En dehors de la zone de précipitation, les mélanges tensio-actifs cationique/anionique manifestent généralement une synergie remarquable concernant la tension superficielle et la cmc. C’est pourquoi, dans l’optique d’une application à l’ultrafiltration micellaire, le présent mémoire aborde l’étude des propriétés superficielles et micellaires (formation de micelles mixtes et propriétés solubilisantes) de systèmes binaires d’agents tensio-actifs anionique/cationique en solution aqueuse ; un seul agent anionique, le dodécylpolyoxyethylènesulfate de triéthanolammonium (TADPS, renfermant environ 3 motifs oxyde d’éthylène) est mélangé avec l’une des espèces cationiques suivantes : le bromure de dodécyltriméthylammonium (DTABr) ou d’héxadécyltriméthylammonium (CTABr), le chlorure de dodécylpyridinium (DPCI) ou d’hexadécylpyridinium (CPCI). En combinant l’équation de Szyszkowski et une extension de la théorie de Rubingh pour les solutions non idéales, nous avons établi les expressions donnant la tension superficielle des solutions mixtes de tensio-actifs et les avons appliquées avec succès aux quatre systèmes définis ci-dessus. Les phénomènes d’adsoprtion gaz-liquide et de micellisation sont décrits correctement par la théorie de Rubingh avec des paramètres d’interaction fortement négatifs : βs compris entre - 15,7 et – 16,9 et βM compris entre - 13,8 et - 18,2, respectivement pour la monocouche adsorbée et pour la micelle mixte. La composition de la monocouche mixte ainsi que celle de la micelle mixte varient de manière dissymétrique en fonction de la composition du mélange, et, pour des mélanges équimolaires, la monocouche absorbée et la micelle mixte sont plus riches en l’espèce la plus fortement tensio-active. L’important effet de synergie sur l’abaissement de tension superficielle (« efficiency ») peut s’expliquer par la diminution remarquable de l’enthalpie libre d’adsorption ainsi que la diminution de l’aire coupée par les chaînes hydrocarbonées dans la monocouche mixte. Par ailleurs, les deux conditions concernant l’efficacité (« effectiveness ») de l’abaissement de tension superficielle (Δγcmc), établies par Hua et Rosen, d’une part, par Zhu et Rosen, d’autre part, sont équivalentes : elles peuvent se déduire des expressions de la tension superficielle établies au cours de ce travail. Lorsque la chaîne hydrophobe des tensio-actifs s’allonge, le paramètre βM décroît plus rapidement que βs et l’effet de synergie sur l’efficacité de l’abaissement de tension superficielle peut disparaître. La présence des groupes oxyde d’éthylène dans la molécule de TADPS retarde dans une certaine mesure la précipitation du complexe cationique/anionique et les domaines de concentration limités par la micellisation mixte d’un côté et la précipitation de l’autre sont plus larges que dans les systèmes classiques cationique/anionique. L’effet anti-synergie observé dans la solubilisation de l’octan-1-ol par les mélanges TADPS/ CTABr est correctement prévu par le modèle de Treiner si l’on considère l’interaction entre les tensio-actifs dans la micelle mixte. La solubilisation du n-heptane dans les mélanges TADPS/ CTABr, TADPS/CPCI et TADPS/DPCI, au moins dans la région riche en cationique, donne lieu à des effets de synergie bien interprétés par le modèle Nishikido : celui-ci considère la micelle mixte comme un mélange idéal du tensio-actif monomère en excès avec un complexe cationique/anionique de stœchiométrie proche de celle correspondant à la limite de précipitation et de pouvoir solubilisant dans le cœur de la micelle pure. Nous avons obtenu un bon accord entre les résultats de solubilisation expérimentaux et calculés ainsi que les rapports molaires raisonnables pour le complexe. En conclusion de cette étude, nous pensons donc que, eu égard à leurs propriétés de solubilisation vis-à-vis des substances non polaires (hydrocarbures benzéniques compris), de tels systèmes cationique/anionique méritent d’être essayés en ultrafiltration micellaire dans le cadre de l’élimination de traces de composés organiques.
Download or read book Cationic Surfactants written by D. Rubingh and published by CRC Press. This book was released on 1990-10-23 with total page 548 pages. Available in PDF, EPUB and Kindle. Book excerpt: Focusing on the solution physical chemistry and surface properties of cationic surfactants, three major sections examine the properties of cationic surfactants themselves both in solution and at interfaces, the interactions of cationic surfactants with other materials, and applications of cationic s
Download or read book Physico Chemical Properties of Selected Anionic Cationic and Nonionic Surfactants written by N.M. van Os and published by Elsevier. This book was released on 2012-12-02 with total page 627 pages. Available in PDF, EPUB and Kindle. Book excerpt: The number of physico-chemical investigations of surfactants in solution, whether aqueous or nonaqueous, has dramatically increased in recent years. However, literature reports on surfactants in solutions are scattered over a plethora of scientific journals and books which differ widely in scope and readership. Such data are often difficult to retrieve because there have been no systematic compilations, with the exception of those for CMCs and for micelle aggregation numbers. The present compilation meets that need by covering, as completely as possible, the physico-chemical properties of selected series of homologous surfactants. These surfactants are in most cases isomerically pure, are well-known, and have been used in numerous academic and industrial studies. The properties include aggregation number, cloud point, CMC, 13C-NMR, correlation length, counterion binding, density, enthalpy of micelle formation, entropy of micelle formation, Gibbs' free energy of micelle formation, head group area, 1H-NMR, hydration number, Krafft temperature, melting point, micelle radius, microscopic viscosity, miscibility curve, partial molar volume, phase inversion temperature, refractive index, self-diffusion coefficient, surface tension, and upper critical temperature. The book also contains two- and three-component phase diagrams of many nonionic surfactants. The solvent is water in most cases; however, some data refer to properties in D2O, electrolyte solutions, and nonaqueous solvents. The variables are temperature and concentration. Where possible, the method of measurement is given. Data on the purity of the compounds and the accuracy of the measurement methods are not included, as these can easily be found in the original sources, which mostly date from the period 1970-1991 and are given at the end of each chapter. The Index section contains a compound index, a property index, a symbol index and a cross index which facilitate easy access to the data. This valuable collection of data will be of great use to anyone involved in Colloid and Surface Science, academics as well as industrial workers, and will stimulate further work.
Download or read book Mixed Surfactant Systems written by Masahiko Abe and published by CRC Press. This book was released on 2004-12-22 with total page 818 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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
Download or read book Encyclopedia of Surface and Colloid Science 2004 Update Supplement written by P. Somasundaran and published by CRC Press. This book was released on 2014-05-08 with total page 842 pages. Available in PDF, EPUB and Kindle. Book excerpt: Appending the Encyclopedia of Surface and Colloid Science by 42 entries as well as 3800 new citations, 1012 equations, and 485 illustrations and chemical structures, this important supplement summarizes a constellation of new theoretical and experimental findings related to chemical characterization, mechanisms, interfacial behavior, methods and mo
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 Design of Surfactant Molecules for Active and Passive Control of Surface and Bulk Properties of Aqueous Solutions written by Nihal Aydogan and published by . This book was released on 2001 with total page 268 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Physical Chemistry for Engineering and Applied Sciences written by A. K. Haghi and published by CRC Press. This book was released on 2018-07-03 with total page 418 pages. Available in PDF, EPUB and Kindle. Book excerpt: This new volume, Physical Chemistry for Engineering and Applied Sciences: Theoretical and Methodological Implications, introduces readers to some of the latest research applications of physical chemistry. The compilation of this volume was motived by the tremendous increase of useful research work in the field of physical chemistry and related subjects in recent years, and the need for communication between physical chemists, physicists, and biophysicists. This volume reflects the huge breadth and diversity in research and the applications in physical chemistry and physical chemistry techniques, providing case studies that are tailored to particular research interests. It examines the industrial processes for emerging materials, determines practical use under a wide range of conditions, and establishes what is needed to produce a new generation of materials. The chapter authors, affiliated with prestigious scientific institutions from around the world, share their research on new and innovative applications in physical chemistry. The chapters in the volume are divided into several areas, covering developments in physical chemistry of modern materials polymer science and engineering nanoscience and nanotechnology
Download or read book Ionic Surfactants and Aqueous Solutions written by Juan H. Vera and published by Walter de Gruyter GmbH & Co KG. This book was released on 2018-07-09 with total page 390 pages. Available in PDF, EPUB and Kindle. Book excerpt: Ionic Surfactants and Aqueous Solutions: Biomolecules, Metals and Nanoparticles covers a wide range of subjects related to aqueous systems, from reverse micelles as ion exchangers to the study of micellar phase transfer catalysis for nucleophilic substitution reactions. The diverse background, expertise and professional interests of the contributors to this book give to it a unique richness of approach in topics of relevance for biotechnology and environmental studies. Over sixty publications presenting research results are combined and expanded in this book by some of the original researchers. At a mature age, and at the summit of successful professional careers, they have taken a second look to the state of the art in the fields that they had pioneered. Eva Rodil and Ana Soto, who had their research formation in the group of Professor Alberto Arce at Universidade de Santiago de Compostela, Spain, are presently professors at that university, Maen Husein is a professor at University of Calgary, Canada. Remy Dumortier, Mohammad Khoshkbarchi, Hamid Rabie and Younok Dumortier Shin, are presently active leaders in the industrial world in Canada and the USA. The editors are retired academics from McGill University, Montreal, Canada, and coauthors of the book Classical Thermodynamics of Fluid Systems.
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 Solution Chemistry of Surfactants written by K.L. Mittal and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 527 pages. Available in PDF, EPUB and Kindle. Book excerpt: The 52nd Colloid and Surface Science Symposium of the Divis ion of Colloid and Surface Chemistry of the American Chemical Society was held in Knoxville, TN, June 12-14, 1978, and one of its Sections was devoted to the topic of Solution Chemistry of Surfactants. Although it was billed as the Section on Solution Chemistry of Surfactants, but it was indeed a veritable inter national symposium on this topic as 51 papers by about 100 con tributors from 12 countries were listed in the program. The present volume and its companion volume 2 document the proceedings of the above-mentioned Section on Solution Chemistry of Surfactants. In 1976 there was held an international symposium on Micellization, Solubilization and Microemulsions in Albany, l the proceedings of which have been chronicled in two volumes. A great deal of material dealing with micelles contributed by a legion of prominent researchers constitutes these volumes but a few subtopics were not adequately covered; so it was deemed appro priate to cover these topics as well as the recent progress in the general area of aggregation of surfactants in this Section. Also as it is the amphiphilicity or amphipathicity* of a surfact ant molecule which is responsible for both adsorption at inter faces and aggregation in solution, so it was considered quite apropos to include the topic of adsorption at interfaces in this Section. Concomitantly, the present volumes not only cover the aggregation phenomena but also the adsorption at interfaces.
Download or read book Systematic Study of Ionic Surfactant and Ethoxylated Alcohol Mixed Micelles written by and published by . This book was released on 1997 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Thermodynamic properties and aggregation behaviour of mixed micellar systems, comprised of sodium alkylcarboxylate salts, CnNa (where n = 8,10,12), ethoxylated alcohols, C4EOx (where EO = ethylene oxide group, X = 0,1,2,3,4), and n-alkyltrimethylammonium bromide salts, RNMe3Br (where R = octyl, decyl, and dodecy), have been studied to characterize the micellization process of the surfactants and to explore the specificity of interactions that lead to distinctive solubilization behaviour of polyethylene alkyl ether compounds in anionic and cationic micelles. The changes in the apparent molar properties of the surfactant in the monomer state, YSÓ, S, and in the micellar state, YMÓ, S; the distribution coefficient of the alcohol, KD between the micellar and aqueous phases; the change in the partial molar properties of the alcohol, Ø YMAS, and alcohol, NA?sub, in the mixed micelle, have been correlated with the chemical structure of the surfactants and alcohols. The apparent molar volumetric properties of the binary aqueous surfactant systems were analyzed using a mass-action model, which provides a quantitative description of the surfactant micellization process. The volumetric transfer functions for C4EOX, Ø YA(W · W + S), at a low concentration of 0.05 m (0.02 m in long chain surfactant systems), from water to the micellar phase were analyzed using a chemical equilibrium model to obtain the solubilization parameters of the alcohol in the micellar system, namely, the distribution coefficient, KD, and the change in the partial molar properties of the alcohol, Ø YMA, between water and the micellar phases. The mean aggregation number, NS?sub, of Csub8Na and Csub10Na in the mixed micelle, obtained from fluorescence quenching measurements, remains unc.
Download or read book Surfactants and Polymers in Aqueous Solution written by Krister Holmberg and published by Wiley. This book was released on 2002-11-22 with total page 562 pages. Available in PDF, EPUB and Kindle. Book excerpt: Many industrial formulations such as detergents, paints, foodstuff and cosmetics contain both surfactants and polymers and their interaction govern many of the properties. This book is unique in that it discusses the solution chemistry of both surfactants and polymers and also the interactions between the two. The book, which is based on successful courses given by the authors since 1992, is a revised and extended version of the first edition that became a market success with six reprints since 1998. Surfactants and Polymers in Aqueous Solution is broad in scope, providing both theoretical insights and practical help for those active in the area. This book contains a thorough discussion of surfactant types and gives information of main routes of preparation. A chapter on novel surfactants has been included in the new edition. Physicochemical phenomena such as self-assembly in solution, adsorption, gel formation and foaming are discussed in detail. Particular attention is paid to the solution behaviour of surfactants and polymers containing polyoxyethylene chains. Surface active polymers are presented and their interaction with surfactants is a core topic of the book. Protein-surfactant interaction is also important and a new chapter deals with this issue. Microemulsions are treated in depth and several important application such as detergency and their use as media for chemical reactions are presented. Emulsions and the choice of emulsifier is discussed in some detail. The new edition also contains chapters on rheology and wetting. Surfactants and Polymers in Aqueous Solution is aimed at those dealing with surface chemistry research at universities and with surfactant formulation in industry.
Download or read book Specialist Surfactants written by I.D. Robb and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 284 pages. Available in PDF, EPUB and Kindle. Book excerpt: Surfactants are vital components in biological systems, are key ingredients in many formulated products and play an important role in many industrial processes. The property which makes surfactants so useful is their ability to stabilize complex colloidal and interfacial systems. It is not surprising therefore that many new surfactant materials are developed, many of which have novel properties. However because their potential is not fully appreciated they remain underutilized by industry. The main purpose of this book is to illustrate the utility of a range of novel surfactants, in particular those which have been found useful in specific areas and which seem to offer promise across a wider range of applications. The contributors are drawn from industry and academic research and provide a comprehensive account of the preparation, properties and applications of these specialist surfactants. Research chemists in industry and academia will find this book a concise and authoritative account of this important group of surfactants.
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 1148 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Cosmetic Formulation written by Heather A.E. Benson and published by CRC Press. This book was released on 2019-04-05 with total page 479 pages. Available in PDF, EPUB and Kindle. Book excerpt: Cosmetics are the most widely applied products to the skin and include creams, lotions, gels and sprays. Their formulation, design and manufacturing ranges from large cosmetic houses to small private companies. This book covers the current science in the formulations of cosmetics applied to the skin. It includes basic formulation, skin science, advanced formulation, and cosmetic product development, including both descriptive and mechanistic content with an emphasis on practical aspects. Key Features: Covers cosmetic products/formulation from theory to practice Includes case studies to illustrate real-life formulation development and problem solving Offers a practical, user-friendly approach, relying on the work of recognized experts in the field Provides insights into the future directions in cosmetic product development Presents basic formulation, skin science, advanced formulation and cosmetic product development
Download or read book Encyclopedia of Colloid and Interface Science written by Tharwat Tadros and published by Springer. This book was released on 2013-06-28 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: An authoritative and comprehensive reference relevant to all scientists and engineers in the field. This encyclopedia not only helps chemistry, materials science and physics researchers to understand the principles, but also provides practicing engineers with the necessary information for implementing practical applications, such as Food and agrochemicals Polymers and ceramics Cosmetics and detergents Paints and coatings Pharmaceuticals and drug delivery In addition, the encyclopedia is an important reference for industrial chemists and chemical engineers faced with a multitude of industrial systems of a colloidal nature. As wide as the range of applications that colloid and interface science has is the range of scientific disciplines that contribute to research and development in this field. These encompass chemistry, physics, biology and mathematics as well as nanoscience and nanotechnology. The encyclopedia provides easy-to-digest information for meeting these interdisciplinary challenges. While providing numerous concise definitions of key terms, the encyclopedia also features more than forty in-depth essays on topics ranging from Agrochemical Formulations to Zeta Potential. All entries are cross-referenced and include selected references to original literature as well as synonyms.
