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The Curvature Model For Mixed Surfactant Microemulsion Systems
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Book Synopsis The Curvature Model for Mixed Surfactant Microemulsion Systems by : Arti Suresh Bhakta
Download or read book The Curvature Model for Mixed Surfactant Microemulsion Systems written by Arti Suresh Bhakta and published by . This book was released on 2007 with total page 99 pages. Available in PDF, EPUB and Kindle. Book excerpt: The objectives of this work were to develop a simple procedure to determine the hydrophilic/lipophilic nature of surfactants based on microemulsion phase behavior and to characterize mixed surfactant systems. The concept of hydrophilic-lipophilic difference (HLD) and the net-average curvature (NAC) were used to develop a model to characterize systems containing anionic-anionic and anionic-nonionic surfactant mixtures. Salinity and temperature scans were carried out and phase changes were noted. It was found that in anionic-anionic systems the linear mixing rule is applicable, and was used to calculate the intrinsic curvature parameter (Ci), which can be used as an alternative scale to the HLB and packing factor to characterize the behavior of a surfactant in microemulsion systems. For anionic-nonionic systems the linear mixing rule does not apply because of the interactions between anionic and nonionic surfactants which seem to be dominated by the charge shielding effect that nonionic surfactants have on anionic surfactants.
Book Synopsis Microemulsions and Related Systems by : Maurice Bourrel
Download or read book Microemulsions and Related Systems written by Maurice Bourrel and published by Editions TECHNIP. This book was released on 2010 with total page 416 pages. Available in PDF, EPUB and Kindle. Book excerpt: Beginning with P.A. Winsor's fundamental hypothesis on a natural interfacial curvature depending on the values of the formulation variables, this unique book shows scientists how to understand the intrinsic structure of these complex systems and their corresponding physical properties... predict how a change in one formulation variable (surfactant structure, oil structure, aqueous phase composition, temperature, etc.) will modify the microemulsion... and systematically formulate microemulsions for individual applications.This book provides a thermodynamic analysis supporting the existence of natural interfacial curvature... compares the behavior of commercial surfactant mixtures and pure isomeric surfactant molecules in order to point out differences and similarities highly significant for various uses... explains how micelles can evolve smoothly and continuously toward solutions containing large quantities of oil and water... gives procedures for fixing quantitative relationships among formulation variables... plus much more.Illustrated with more than 200 diagrams, tables, and photographs, and completely referenced, this superb volume is essential reading for surfactant, colloid, and physical chemists in both academe and industry, as well as chemical engineers, biotechnologists, and petroleum engineers.Contents: 1. The R-Ratio. 2. Aqueous solutions containing amphiphiles. 3. Nonpolar solutions containing amphiphiles. 4. The phase behavior and properties of solutions containing amphiphiles, organic liquids, and water: micellar solutions. 5. Methods for promoting phase changes. 6. Compensating changes between formulation variables. 7. Solubilization. 8. Thermodynamics of solubilized systems.
Book Synopsis Microemulsions Theory and Practice by : Leon Prince
Download or read book Microemulsions Theory and Practice written by Leon Prince and published by Elsevier. This book was released on 2012-12-02 with total page 192 pages. Available in PDF, EPUB and Kindle. Book excerpt: Microemulsions: Theory and Practice covers the development of the theory and practice of microemulsion systems. This book is divided into seven chapters that explore the physics and chemistry of microemulsions. This book deals first with the commercial history of microemulsions, from the discovery of carnauba wax emulsions to polymer emulsions. This topic is followed by discussions on the theoretical aspects of microemulsion formulation techniques and the design of other products. The subsequent chapter describes the microemulsion formulation with less solubilizer or emulsifier together with their optical properties. A chapter examines the mixed film theory that explains the dispersions, oil-water interface, and inferences in microemulsions. Another chapter considers the role of microemulsions in micellar solutions and their relations to the concentrations of different compounds. This chapter also looks into the association phenomena of three-component phase equilibria diagrams and liquids crystals to microemulsions. The concluding chapter discusses the role of the capillary and hydrostatic forces on the entrapment of oil in the reservoir and the necessary conditions for the displacement of entrapped oil. The important properties and economic aspects of a microemulsion slug required for the tertiary oil recovery are also covered in this chapter.
Book Synopsis Mixed Surfactant Systems by : Keizo Ogino
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.
Book Synopsis Mixed Surfactant Systems by : Masahiko Abe
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
Book Synopsis Mixed Surfactant Systems by : Paul M. Holland
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.
Book Synopsis Encyclopedia of Colloid and Interface Science by : Tharwat Tadros
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.
Book Synopsis Thermodynamics of Microemulsion Systems by : Victor Torrealba
Download or read book Thermodynamics of Microemulsion Systems written by Victor Torrealba and published by . This book was released on 2017 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Surfactant-based enhanced oil recovery is a promising technique in the petroleum industry due to surfactants ability to mobilize previously trapped oil by reducing capillary forces at the pore-scale. However, the field-scale implementation of these techniques has been challenging by the high cost of chemicals, which makes the margin of error for the deployment of such methods increasingly narrow. Some commonly recognized issues are surfactant adsorption, surfactant partitioning to the excess phases, surfactant thermal and physical degradation, and scale-representative microemulsion phase behavior.In this dissertation, we present a novel microemulsion phase behavior model accounting for changing micellar curvature conditions under the assumption of a general prolate spheroid geometry. This approach is shown to be consistent with the definition of the three-phase solubilization ratios obtained by combining our previously developed interfacial tension model with Huhs correlation. This model removes key assumptions in recent microemulsion phase behavior model of Khorsandi and Johns (2016), such as symmetric phase behavior in the Type III region, constant characteristic length- the Type III, constant spherical geometry of micelles, and finite critical characteristic length-scale. Finally, the model is coupled with Huhs correlation to present a coupled approach that allows for the accurate capturing of both phase behavior and interfacial tensions.For the case considered, the curvature model provided excellent results compared to experimental data. The results of the coupled approach are compared with results consisting of only phase behavior tuning, where the interfacial tensions are described using Huhs correlation and the standard scaling constant. For the case considered, the curvature model yielded excellent capturing of both phase behavior and interfacial tension data, whereas the alternative approach of just tuning phase behavior yielded unsatisfactory values of interfacial tensions, with discrepancies of over an order of magnitude.Then, we introduce a consistent and robust model that predicts interfacial tensions for all microemulsion Winsor types and overall compositions. The model incorporates film bending arguments and Huhs equation, and is coupled to phase behavior so that simultaneous tuning of both IFT and phase behavior is possible. The oil-water interfacial tension and characteristic length are shown to be related to each other through the hydrophilic-lipophilic deviation (HLD). The phase behavior is tied to the micelle curvatures, without the need for using net average curvature (NAC). The interfacial tension model is tied to solubilization ratios in order to introduce a coupled interfacial tension-phase behavior model for all phase environments. The approach predicts two- and three-phase interfacial tensions and phase behavior (i.e. tie lines and tie triangles) for changes in composition and HLD input parameters, such as temperature, pressure, surfactant structure parameters, and oil equivalent alkane carbon number. Comparisons to experimental data show excellent fits and predictive capability.Further, we introduce a new empirical phase behavior model based on chemical potentials and . The model is able to describe physical two-phase regions, and is shown to represent accurately experimental data at fixed composition and changing (e.g. a salinity scan) as well as variable composition data at fixed . Further, the model is extended to account for surfactant partitioning into the excess phases. The model is benchmarked against experimental data (considering both pure alkane and crude oil cases), showing excellent fits for a wide variety of experiments, and is compared to the -NAC EoS model for reference.In this research, we allow for surfactant partitioning into both the water and oil excess phases using a simple approach, and then relate the relevant surfactant partitioning coefficients to the state function so that all independent K-values are predicted for all Winsor environments. Surfactant screening based on EO and PO groups is also considered based on estimated K-values. Key dimensionless groups as a function of activity coefficients are identified, which allow for a simplified description of the surfactant partition coefficients. As an example, the surfactant partition coefficients are combined with the CP equation-of-state model to describe and predict the phase behavior when the excess phases are not pure.One common theme in all contributions in this dissertation is the emphasis on having improved predictive capabilities. For every contribution, we propose a way forward for how to determine model parameters using a single or reduced number of experiments, and then predict for conditions outside the range of experimental observation. This is of great importance for petroleum engineering applications.
Book Synopsis Microemulsion Systems by : Henri L. Rosano
Download or read book Microemulsion Systems written by Henri L. Rosano and published by CRC Press. This book was released on 1987-03-27 with total page 464 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Handbook of Microemulsion Science and Technology by : Promod Kumar
Download or read book Handbook of Microemulsion Science and Technology written by Promod Kumar and published by CRC Press. This book was released on 2018-05-02 with total page 864 pages. Available in PDF, EPUB and Kindle. Book excerpt: Demonstrating methods for overcoming stability issues in paints, wax dispersions, cosmetics, food products, and other industrial applications, this reference probes theoretical and practical issues surrounding microemulsion science and technology. Featuring the work of 51 international experts and containing almost 1000 instructive tables, equations, and illustrations, this book reviews the performance of, and prospects for, experimental methods such as X-ray diffraction, transmission electron microscopy (TEM), light scattering, small angle neutron scattering, viscosimetry, and nuclear magnetic resonance (NMR) to characterize various aspects of the dispersed phase of microemulsions.
Download or read book Microemulsions written by Monzer Fanun and published by CRC Press. This book was released on 2008-12-15 with total page 568 pages. Available in PDF, EPUB and Kindle. Book excerpt: The effective use of microemulsions has increased dramatically during the past few decades as major industrial applications have expanded in a variety of fields. Microemulsions: Properties and Applications provides a complete and systematic assessment of all topics affecting microemulsion performance and discusses the fundamental characteristics, t
Book Synopsis Surfactant Aggregation by : J.H. Clint
Download or read book Surfactant Aggregation written by J.H. Clint and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 293 pages. Available in PDF, EPUB and Kindle. Book excerpt: Surface Active Agents (surfactants) are vital components in biological systems, form key ingredients in consumer products and play an important role in many industrial processes. For example, cell membranes owe their structure to the aggregation of surfactants known as lipids which form a major component of the membrane. Other natural surfactants occur in the digestive system, in the lungs, and even in such substances as crude oil. Man-made surfactants are used in a wide range of domestic and industrial products and processes. In addition to detergents and personal care products, surfactants have found uses in almost every branch of the chemical industry as well as in several other industries. These include dyestuffs, fibres, mineral process ing, oil field chemicals, paints, pesticides, pharmaceuticals and plastics. Surfactants are versatile materials which are manufactured in a huge variety of forms to suit all of these applications. As a result of their importance, the technical literature on all aspects of surfactant behaviour is now very extensive. Surprisingly, however, the treatment in textbooks has been somewhat fragmented, often in the form of conference proceedings or edited, multi-authored works, both lacking in continuity.
Book Synopsis Nanoemulsions by : Seid Mahdi Jafari
Download or read book Nanoemulsions written by Seid Mahdi Jafari and published by Academic Press. This book was released on 2018-02-24 with total page 665 pages. Available in PDF, EPUB and Kindle. Book excerpt: Nanoemulsions: Formulation, Applications, and Characterization provides detailed information on the production, application and characterization of food nanoemulsion as presented by experts who share a wealth of experience. Those involved in the nutraceutical, pharmaceutical and cosmetic industries will find this a useful reference as it addresses findings related to different preparation and formulation methods of nanoemulsions and their application in different fields and products. As the last decade has seen a major shift from conventional emulsification processes towards nanoemulsions that both increase the efficiency and stability of emulsions and improve targeted drug and nutraceutical delivery, this book is a timely resource. Summarizes general aspects of food nanoemulsions and their formulation Provides detailed information on the production, application, and characterization of food nanoemulsion Reveals the potential of nanoemulsions, as well as their novel applications in functional foods, nutraceutical products, delivery systems, and cosmetic formulations Explains preparation of nanoemulsions by both low- and high-energy methods
Book Synopsis Surfactants in Solution by : K.L. Mittal
Download or read book Surfactants in Solution written by K.L. Mittal and published by Springer Science & Business Media. This book was released on 2013-03-08 with total page 693 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume chronicles the proceedings of the 8th International Symposium on Surfactants in Solution (SIS) held in Gainesville, FL, June 10-15, 1990. This series of symposia have been smoothly running since 1976, but the appellation "Surfactants in Solution" was used for the first time in 1982 in Lund. Since then our logo "SIS" has become very familiar to everyone involved in surfactants. In Lund the meeting was billed as the Fourth International Symposium on Surfactants in Solution. Earlier three events were held under different rubrics, but proceedings of all these symposia, except the 7th SIS held in Ottawa in 1988, have been properly documented. As a matter of fact so far 10 volumes have appeared under the title "Surfactants in Solution". 1,2,3 The program for the 9th SIS was very comprehensive and many ramifications of surfactants were covered, and it was a veritable international event. It contained a total of 384 papers by 869 authors from practically every corner of our planet. Just the sheer number of papers is a testimonial to the high tempo of research and tremendous interest in this wonderful class of materials. As in the past, there were plenary lectures (5), invited talks (37), oral presentations (195) and poster presentations (147). The plenary lectures were given by Prof. J. Th. G. Overbeek, Prof. C. A. Bunton, Prof. H. Ti Tien and Dr. J. Swalen. The lecture by Prof. Overbeek, the doyen of surface and colloid science, was a real treat.
Book Synopsis Progress in Microemulsions by : S. Martellucci
Download or read book Progress in Microemulsions written by S. Martellucci and published by Springer Science & Business Media. This book was released on 2013-11-11 with total page 283 pages. Available in PDF, EPUB and Kindle. Book excerpt: The current state of the art of various aspects of micro emulsion systems is reflected in this volume. Major topics discussed include: general background on solubilized systems, phase diagrams and phase equi libria, bicontinuous microemulsions, Winsor's phases, theories and models of complex self association structures, cry tical behaviour, phase tran sitions in lyotropic liquid crystals. I hope that this book will serve its intended objective of reflecting our current understanding of microemulsions both in theory and practice, and that it will be useful to researchers, both novices as well as experts, as a valuable reference source. I feel indebted to the people of the Ettore Majorana Centre: the friendly atmosphere of the Erice centre provided a very effective environ ment to enjoy the company of colleagues and friends during breaks and after sessions, and to discuss problems of mutual interest. The courtesy, efficiency and devotion of the secretarial and technical staff was also appreciated, and greatly contributed to make the Workshop a smoothly run ning one. The Scientific Secretary Donatella Senatra Department of Physics University of Florence (Italy) v INTRODUCTION The decision to publish. in a more permanent form than heretofore. the Proceedings of the Workshop on "Progress in Microemulsion" of the Inter national School of Quantum Electronics. which was held in Erice (Italy) from October 26 to November 1st. 1985. under the auspices of the "Ettore Majorana" Centre for Scientific Culture. will prove to be a sound one.
Book Synopsis Micellization, Solubilization, and Microemulsions by : K. Mittal
Download or read book Micellization, Solubilization, and Microemulsions written by K. Mittal and published by Springer. This book was released on 1977-06 with total page 536 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume and its companion Volume 2 chronicle the proceed ings of the International Symposium on Micellization, Solubiliza tion, and t1icroemulsions held under the auspices of the Northeast Regional Meeting of the American Chemical Society in Albany, New York, August 8-11, 1976. The technical program consisted of 48 papers by 91 authors from twelve countries. The program was divided into six sessions, and Dr. Hartley delivered the Concluding Remarks. Subsequently, six more papers were contributed for the proceedings volumes with the result that these volumes contain 51 papers (three papers are not included for certain reasons) and are divided into seven parts. The first three parts are embodied in Volume 1 and the remaining four parts constitute Volume 2; each part is followed by a Discussion Section. Dr. Hartley's Concluding Remarks are in cluded in both volumes . . When the idea of arranging a symposium on micelles was broached to me, I accepted it without an iota of hesitation. I had two op tions: either to make it a one- or two-sessions symposium, or bring together the global community actively carrying out research in this area. I opted for the latter as the subject was very timely and I knew that it would elicit very enthusiastic response. In order to broaden the scope of the symposium, I suggested that the theme of the symposium should be Micellization. Solubilization and Microemulsions.
Book Synopsis The Structure, Dynamics and Equilibrium Properties of Colloidal Systems by : D. Bloor
Download or read book The Structure, Dynamics and Equilibrium Properties of Colloidal Systems written by D. Bloor and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 869 pages. Available in PDF, EPUB and Kindle. Book excerpt: Proceedings of the NATO Advanced Study Institute on Properties of Colloidal Systems, Aberystwyth, Wales, U.K., September 10-23, 1989
