Download or read book Structure Rheology and Thermodynamics of Wormlike Micelle nanoparticle Mixtures written by and published by . This book was released on 2009 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Wormlike micelles (WLMs) have become widely used in a number of industrial and consumer products and processes where they come in contact with colloidal species. Still, relatively little is understood regarding the interactions between WLMs and colloids and resulting changes in macroscopic properties. As such, the goals of this thesis are to uncover the mechanisms by which WLMs interact with colloidal particles, and to determine how these interactions affect changes in macroscopic properties for mixtures of model WLMs and colloidal nanoparticles. Aqueous mixtures of cetyltrimethylammonium bromide (CTAB) and sodium nitrate (NaNO 3) serve as a model system in which to study the self-assembly, phase behavior and rheology of WLMs. Characterization of CTAB/NaNO 3 solutions across a wide range of state variables enables full exploration of WLM phase behavior, including micellization, the sphere-to-rod transition, overlap, and entanglement. Combining rheological measurements and small angle neutron scattering (SANS) yields measurement of the relevant length scales of WLMs, and provides a microstructural basis for the resulting changes in WLM rheology. In the concentrated regime, CTAB micelles undergo shear banding, an important flow instability that occurs in a variety of WLMs. Combination of rheometry, velocimetry, and spatially-resolved flow-SANS shows that shear banding of CTAB results from a shear-induced isotropic-paranematic phase transition. The use of a constitutive model enables direct, quantitative coupling of shear banding to equilibrium phase behavior, and enables construction of non-equilibrium phase diagrams for shear banding fluids. Establishment of structure property relationships for model WLMs thus serves as a basis for examining the interactions and changes in the resulting properties of CTAB/NaNO 3 WLMs in the presence of model cationically modified silica nanoparticles. Structural and thermodynamic measurements of interactions at the colloid-surfactant interface show that adsorption of surfactant results in the formation of hemimicellar surface structures, which in turn interact with WLMs to form micelle-nanoparticle junctions. These junctions give rise to unique rheological modification of WLMs, such as significant increase in viscosity and viscoelasticity, and arise from the contribution of effective cross-linking of the micellar solution to form a viscoelastic network. Furthermore, micelle-nanoparticle junctions suppress shear banding due to hindered orientational mobility of the micelles. Conversely, the formation of micelle-nanoparticle junctions gives rise to new colloidal interactions mediated by the bridging of micelles between particles, leading to thermoreversible phase separation of the colloid. In order to better understand and describe these interactions, a statistical mechanical model has been developed to capture the phenomenology of wormlike micellar bridging. The model predicts strong-long range attractions arising from the distribution in length of the micelles. Because the model is based on experimentally measureable parameters, it yields a priori predictions of interaction potential, which are in good agreement measurements of the colloidal phase behavior and of the second osmotic virial coefficient. The results of this work demonstrate that rheological properties of WLMs can be uniquely tuned by the addition of particles, and conversely the interactions of colloids in the presence can be uniquely controlled through the self-assembly of WLMs and interactions at the surfactant-colloid interface.
Download or read book Advances in Nanotechnology Research and Application 2011 Edition written by and published by ScholarlyEditions. This book was released on 2012-01-09 with total page 8760 pages. Available in PDF, EPUB and Kindle. Book excerpt: Advances in Nanotechnology Research and Application: 2011 Edition is a ScholarlyEditions™ eBook that delivers timely, authoritative, and comprehensive information about Nanotechnology. The editors have built Advances in Nanotechnology Research and Application: 2011 Edition on the vast information databases of ScholarlyNews.™ You can expect the information about Nanotechnology in this eBook to be deeper than what you can access anywhere else, as well as consistently reliable, authoritative, informed, and relevant. The content of Advances in Nanotechnology Research and Application: 2011 Edition has been produced by the world’s leading scientists, engineers, analysts, research institutions, and companies. All of the content is from peer-reviewed sources, and all of it is written, assembled, and edited by the editors at ScholarlyEditions™ and available exclusively from us. You now have a source you can cite with authority, confidence, and credibility. More information is available at http://www.ScholarlyEditions.com/.
Download or read book Wormlike Micelles written by Cecile A Dreiss and published by Royal Society of Chemistry. This book was released on 2017-03-17 with total page 428 pages. Available in PDF, EPUB and Kindle. Book excerpt: Wormlike micelles are elongated flexible self-assembled structures created from the aggregation of amphiphiles and their resulting dynamic networks have gained attention for a number of uses, particularly in the oil industry. Written by experts, Wormlike Micelles describes the latest developments in the field providing an authoritative guide on the subject. The book starts with an introductory chapter giving an overview of the area and then looks at the three key topics of new wormlike micelle systems, characterization and applications. New systems covered in the first part include reverse wormlike micelles and stimuli-responsive wormlike micelles. The second part explores cutting-edge techniques that have led to advances in the understanding of their structure and dynamics, including direct imaging techniques and the combination of rheology with small-angle neutron scattering techniques. Finally, the book reviews their use in oil and gas well treatments as well as surfactant drag reducing solutions. Aimed at postgraduate students and researchers, this text is essential reading for anyone interested in soft matter systems.
Download or read book Smart Wormlike Micelles written by Yujun Feng and published by Springer. This book was released on 2015-01-23 with total page 103 pages. Available in PDF, EPUB and Kindle. Book excerpt: This Brief provides an up-to-date overview of smart surfactants and describes a broad spectrum of triggers that induce the formation of wormlike micelles or reversibly tune the morphology of surfactant aggregates from wormlike micelles to another state, or vice versa. Combining the fields of chemistry, physics, polymer science, and nanotechnology, its primary focus is on the design, formulation, and processing of intelligent viscoelastic surfactant solutions, covering the scientific principles governing responsiveness to one or more particular triggers, down to the end-use-driven functions. The first chapter explains why and how surfactants self-assemble into viscoelastic wormlike micellar solutions reminiscent of polymer solutions, while the following chapters show how the response to a given trigger translates into macroscopic rheological changes, including temperature, light, pH, CO2, redox, hydrocarbon, etc. The last chapter demonstrates the applications of these viscoelastic assemblies in oil and gas production, drag reduction, biomaterials, cleaning processes, electrorheological and photorheological fluids. Comments and perspectives are provided at the end to conclude this Brief. This Brief is aimed at chemists, physicists, chemical engineers and nano-scientists who are involved in self-assemblies and applications of surfactants, as well as graduates in physical chemistry. Yujun Feng, Ph.D., is a professor at the State Key Laboratory of Polymer Materials Engineering, Polymer Research Institute of Sichuan University, Chengdu, Sichuan Province, P. R. China. Zonglin Chu, Ph.D., is a post-doctoral fellow working at the Physical Chemistry Institute, University of Zürich, Switzerland. Cécile A. Dreiss, Ph.D., is a senior lecturer at the Institute of Pharmaceutical Science, King’s College London, UK.
Download or read book Nanocarrier Drug Delivery Systems written by Prashant L. Pingale and published by Walter de Gruyter GmbH & Co KG. This book was released on 2024-09-02 with total page 668 pages. Available in PDF, EPUB and Kindle. Book excerpt: Nanotechnology can treat diseases by site-specific and target-oriented delivery of precise medicines. Nanomaterials improve the efficacy of drugs and selective diagnosis. The book covers detection and treatment. It explains the use of nanocarriers for a variety of diseases such as cardiovascular and respiratory diseases, cancer, and ulcerative colitis. It includes topical, transdermal, and ocular drug delivery and combined medication delivery.
Download or read book Modeling and Analysis of Self assembled Hierarchical Nano structures written by Meisam Asgari and published by . This book was released on 2015 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: "The goal of this study was to understand and model the mechanics of four groups of self-assembled nano-structural soft materials, namely wormlike micelles, toroidal micellar bundles, lipid bilayers, and collagen fibers. The constitutive models derived here are aimed at extending our ability to predict the response of biological organisms under mechanical loads from first principles, directly from the behavior of their main microscopic constituents.A theoretical framework for the elasticity of wormlike micelles, which helps us characterize their mechanical behavior, was missing in the literature. A model was derived for the elastic free-energy of such materials taking into account the interactions between their constituent molecules. The model was applied to the case of a wormlike micelle with the shape of an open or closed circular arc. The case of micelles of toroidal shape was then treated, introducing statistical-thermodynamical conceptsof self-assembly. The results were found to be consistent with the experimental ones available in the literature. To relate the theoretical model to experiments, procedures for obtaining the material parameters from experimental data were discussed.A model for the free energy of nano-structured toroidal bundles in wormlike micellar solutions was derived to characterize their mechanical behavior. The model accounts for the surface tension and the bending elasticity of each toroidal micelle comprising the bundle, as well as for the van der Waals interactions between adjacent tori. The Hamaker constant and the spontaneous curvature of the bundles were predicted for a range of representative values of the flexural rigidity of micelles by fitting the volume fraction density to available experimental data. The values obtained for the material parameters met the requirements for metastability of the bundles. The obtained free energy of a bundle was found to be of the same order of magnitude, but 2-5 k_BT greater than previously reported predictions for one single toroidal micelle. The results indicate that the system may reach metastable equilibria involving bundles with greater energies than single tori, for certain processing paths.The pores in a lipid bilayer permit the targeted delivery of drugs and genes to the cell, and regulate the concentration of various molecules within the cell. A good understanding of the elastic behavior of a lipid-bilayer edge is needed for controlling the formation and growth of such pores. To model this phenomenon, the molecular-level interactions were modeled to obtain the free-energy of the edge of an open lipid bilayer. In contrast to the previous studies, the new model shows the dependence of the free energy of the edge to its geometry. The dependence of the elastic free-energy of the edge on the size of the pore was revisited through an illustrative example. The results were found to be in good agreement with previous experimental observations. The new model can be used to understand the pore growth and equilibrium configurations of open lipid bilayers.Collagen fibers are the most abundant proteins in the extracellular matrix of biological tissues. They contribute to their tensile strength, mechanical stability, and cohesiveness. In the last part of this study, a continuum-mechanical model for the elasticity of wave-like structures similar in shape to collagen fibers observed in biological soft tissues was investigated. The structure of the collagen fiber at the micro-scale was idealized as intertwined helical fibrils. The model is based on the linear isotropic elasticity assumption, and accounts for the local shear, twist, stretch, and bending of the helical fibrils forming the collagen fiber. Key material parameters include the elastic and shear moduli of the helical fibrils forming the collagen fiber. The model can be used to quantify normal and shear stresses in the collagen fiber in response to bending deformations." --
Download or read book Interactions Phase Behavior and Rheological Properties of Polymer nanoparticle Mixtures written by Megha Madhukar Surve and published by . This book was released on 2006 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Giant Micelles written by Raoul Zana and published by CRC Press. This book was released on 2007-05-30 with total page 577 pages. Available in PDF, EPUB and Kindle. Book excerpt: The co-evolution of a strong theoretical framework alongside application of a range of sophisticated experimental tools engendered rapid advancement in the study ofgiant micelles. Beginning with Anacker and Debye's 1951 experimental study of elongated micelles by light scattering and their subsequent theoretical inference that the thermodynamic
Download or read book Colloidal Suspension Rheology written by Jan Mewis and published by Cambridge University Press. This book was released on 2012 with total page 417 pages. Available in PDF, EPUB and Kindle. Book excerpt: Presented in an accessible and introductory manner, this is the first book devoted to the comprehensive study of colloidal suspensions.
Download or read book Self Assembly written by Ramanathan Nagarajan and published by John Wiley & Sons. This book was released on 2019-01-07 with total page 364 pages. Available in PDF, EPUB and Kindle. Book excerpt: An introduction to the state-of-the-art of the diverse self-assembly systems Self-Assembly: From Surfactants to Nanoparticles provides an effective entry for new researchers into this exciting field while also giving the state of the art assessment of the diverse self-assembling systems for those already engaged in this research. Over the last twenty years, self-assembly has emerged as a distinct science/technology field, going well beyond the classical surfactant and block copolymer molecules, and encompassing much larger and complex molecular, biomolecular and nanoparticle systems. Within its ten chapters, each contributed by pioneers of the respective research topics, the book: Discusses the fundamental physical chemical principles that govern the formation and properties of self-assembled systems Describes important experimental techniques to characterize the properties of self-assembled systems, particularly the nature of molecular organization and structure at the nano, meso or micro scales. Provides the first exhaustive accounting of self-assembly derived from various kinds of biomolecules including peptides, DNA and proteins. Outlines methods of synthesis and functionalization of self-assembled nanoparticles and the further self-assembly of the nanoparticles into one, two or three dimensional materials. Explores numerous potential applications of self-assembled structures including nanomedicine applications of drug delivery, imaging, molecular diagnostics and theranostics, and design of materials to specification such as smart responsive materials and self-healing materials. Highlights the unifying as well as contrasting features of self-assembly, as we move from surfactant molecules to nanoparticles. Written for students and academic and industrial scientists and engineers, by pioneers of the research field, Self-Assembly: From Surfactants to Nanoparticles is a comprehensive resource on diverse self-assembly systems, that is simultaneously introductory as well as the state of the art.
Download or read book Gemini Surfactants written by Raoul Zana and published by CRC Press. This book was released on 2003-10-07 with total page 345 pages. Available in PDF, EPUB and Kindle. Book excerpt: Generating much interest in both academic and scientific circles, Gemini Surfactants gathers the most up-to-date research in gemini surfactantproduction and demonstrates how their propertiesand performance can revolutionize the current industrial application of these surfactants. It surveys the state of special gemini surfactants, including nonionic, zwitterionic, fluorinated, and amino-acid-based surfactants. Gemini Surfactants considers the synthesis, phase behavior, and rheology of gemini and related surfactants and clarifies the adsorption and surface tension behavior of gemini surfactants at air–water, oil–water, and solid–water interfaces. The book also details the physicochemical properties and microstructure of aqueous micellar solutions of gemini surfactants and describes mixed micellization between gemini surfactants and conventional surfactants.
Download or read book Nonionic Surfactants written by Dieter Balzer and published by CRC Press. This book was released on 2000-07-12 with total page 560 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume provides a comprehensive overview for recognizing and producing the characteristics of successful special surfactant agents. It highlights one of the most versatile and effective surface-active surfactant agents, detailing the synthesis and production, chemical properties and behaviours, and application for alkyl polyglucosides.
Download or read book Soft Matter Characterization written by Redouane Borsali and published by Springer Science & Business Media. This book was released on 2008-07-28 with total page 1490 pages. Available in PDF, EPUB and Kindle. Book excerpt: This 2-volume set includes extensive discussions of scattering techniques (light, neutron and X-ray) and related fluctuation and grating techniques that are at the forefront of this field. Most of the scattering techniques are Fourier space techniques. Recent advances have seen the development of powerful direct imaging methods such as atomic force microscopy and scanning probe microscopy. In addition, techniques that can be used to manipulate soft matter on the nanometer scale are also in rapid development. These include the scanning probe microscopy technique mentioned above as well as optical and magnetic tweezers.
Download or read book Structures and Interactions of Ionic Liquids written by Suojiang Zhang and published by Springer. This book was released on 2013-12-20 with total page 201 pages. Available in PDF, EPUB and Kindle. Book excerpt: Structures, Bonding and Hydrogen Bonds, by Kun Dong, Qian Wang, Xingmei Lu, Suojiang Zhang Aggregation in System of Ionic Liquids, by Jianji Wang, Huiyong Wang Dissolution of Biomass Using Ionic Liquids, by Hui Wang, Gabriela Gurau, Robin D. Rogers Effect of the Structures of Ionic Liquids on Their Physical-Chemical Properties, by Yu-Feng Hu, Xiao-Ming Peng Microstructure study of Ionic liquids by spectroscopy, by Haoran Li Structures and Thermodynamic Properties of Ionic Liquids, by Tiancheng Mu, Buxing Han
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.
Download or read book Theory and Applications of Colloidal Suspension Rheology written by Norman J. Wagner and published by Cambridge University Press. This book was released on 2021-04-15 with total page 437 pages. Available in PDF, EPUB and Kindle. Book excerpt: Essential text on the practical application and theory of colloidal suspension rheology, written by an international coalition of experts.
Download or read book Polymer Colloids written by Rodney Priestley and published by Royal Society of Chemistry. This book was released on 2019-12-02 with total page 442 pages. Available in PDF, EPUB and Kindle. Book excerpt: Academic and industrial research around polymer-based colloids is huge, driven both by the development of mature technologies, e.g. latexes for coatings, as well as the advancement of new materials and applications, such as building blocks for 2D/3D structures and medicine. Edited by two world-renowned leaders in polymer science and engineering, this is a fundamental text for the field. Based on a specialised course by the editors, this book provides the reader with an invaluable single source of reference. The first section describes formation, explaining basic properties of emulsions and dispersion polymerization, microfluidic approaches to produce polymer-based colloids and formation via directed self-assembly. The next section details characterisation methodologies from microscopy and small angle scattering, to surface science and simulations. The final chapters close with applications, including Pickering emulsions and molecular engineering for materials development. A comprehensive guide to polymer colloids, with contributions by leaders in their respective areas, this book is a must-have for researchers and practitioners working across polymers, soft matter and chemical and molecular engineering.
