Self Assembly Of Gemini Surfactant Molecules And The Properties Of Nano Confined Water
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Self Assembly Of Gemini Surfactant Molecules And The Properties Of Nano Confined Water
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Author : Sriteja Mantha
language : en
Publisher:
Release Date : 2016
Self Assembly Of Gemini Surfactant Molecules And The Properties Of Nano Confined Water written by Sriteja Mantha and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2016 with categories.
Gemini surfactants are dimeric surfactants, formed by connecting two single tail surfactants with a linker at or near their headgroups. These surfactants in water have tendency to self-assemble into lyotropic liquid crystalline (LLC) morphologies with percolating water channels, which have potential applications as membranes for selective ion transport, controlled release formulations, media for chemical separation and catalysis. Using molecular dynamics simulations, this thesis investigates self-assembly behavior of gemini surfactants and properties of water confined in their LLCs. Length of the linker is known to significantly effect the self-assembly behavior of gemini surfactants in water. Dicarboxylate gemini surfactants with odd number of carbon atoms in the linker are shown to favor bicontinuous cubic (Gyroid) LLC morphologies over hexagonally(H) packed cylinders. On the other hand, surfactants with even number of carbon atoms favor H morphologies at same water content. This thesis suggests that, differences in LLC phase behavior of odd and even gemini surfactants is due to differences in the headgroup/headgroup repulsion caused by inherent conformational preferences of the surfactants. In the LLCs formed by dicarboxylate gemini surfactants, water molecules are under charged confinement. Structure and dynamic properties of water in these confinements depend on width of the water channel and nature of the counterion. Simulation results reported in this thesis suggest that water dynamics is at least an order of magnitude slower than that in bulk water, and decrease in the size of water channel results in further decrease in the dynamic properties. Counterion effect investigated in this thesis suggests that excluded volume effects play a significant role in the dynamics of confined water. Water molecules in surfactant systems with TMA+ as counterion have access to less volume for mobility than the systems with Na+ and K+ as counterion. At high water content, these excluded volume effects dictate the water dynamics. Whereas at low water content, strength of counterion-water interaction coupled with excluded volume effects dictate the water dynamics. Confinement provides an ideal environment to explore the unusual properties of supercooled water. At a temperature close to 225K, water molecules are known to undergo change in their dynamic behavior. This thesis attributes change in the dynamic behavior of supercooled water to changes in the dynamical regimes of potential energy landscape. At temperatures above dynamic crossover, water dynamics is dictated by landscape influenced regime and below crossover it is governed by landscape dominated regime.
Self Assembly Of Gemini Surfactant Molecules And The Properties Of Nano Confined Water
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Author : Sriteja Mantha
language : en
Publisher:
Release Date : 2016
Self Assembly Of Gemini Surfactant Molecules And The Properties Of Nano Confined Water written by Sriteja Mantha and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2016 with categories.
Gemini surfactants are dimeric surfactants, formed by connecting two single tail surfactants with a linker at or near their headgroups. These surfactants in water have tendency to self-assemble into lyotropic liquid crystalline (LLC) morphologies with percolating water channels, which have potential applications as membranes for selective ion transport, controlled release formulations, media for chemical separation and catalysis. Using molecular dynamics simulations, this thesis investigates self-assembly behavior of gemini surfactants and properties of water confined in their LLCs. Length of the linker is known to significantly effect the self-assembly behavior of gemini surfactants in water. Dicarboxylate gemini surfactants with odd number of carbon atoms in the linker are shown to favor bicontinuous cubic (Gyroid) LLC morphologies over hexagonally(H) packed cylinders. On the other hand, surfactants with even number of carbon atoms favor H morphologies at same water content. This thesis suggests that, differences in LLC phase behavior of odd and even gemini surfactants is due to differences in the headgroup/headgroup repulsion caused by inherent conformational preferences of the surfactants. In the LLCs formed by dicarboxylate gemini surfactants, water molecules are under charged confinement. Structure and dynamic properties of water in these confinements depend on width of the water channel and nature of the counterion. Simulation results reported in this thesis suggest that water dynamics is at least an order of magnitude slower than that in bulk water, and decrease in the size of water channel results in further decrease in the dynamic properties. Counterion effect investigated in this thesis suggests that excluded volume effects play a significant role in the dynamics of confined water. Water molecules in surfactant systems with TMA+ as counterion have access to less volume for mobility than the systems with Na+ and K+ as counterion. At high water content, these excluded volume effects dictate the water dynamics. Whereas at low water content, strength of counterion-water interaction coupled with excluded volume effects dictate the water dynamics. Confinement provides an ideal environment to explore the unusual properties of supercooled water. At a temperature close to 225K, water molecules are known to undergo change in their dynamic behavior. This thesis attributes change in the dynamic behavior of supercooled water to changes in the dynamical regimes of potential energy landscape. At temperatures above dynamic crossover, water dynamics is dictated by landscape influenced regime and below crossover it is governed by landscape dominated regime.
Gemini Surfactants
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Author : Raoul Zana
language : en
Publisher: CRC Press
Release Date : 2003-10-07
Gemini Surfactants written by Raoul Zana and has been published by CRC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2003-10-07 with Science categories.
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.
Encyclopedia Of Colloid And Interface Science
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Author : Tharwat Tadros
language : en
Publisher: Springer
Release Date : 2013-06-28
Encyclopedia Of Colloid And Interface Science written by Tharwat Tadros and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013-06-28 with Technology & Engineering categories.
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.
Reverse Micelles
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Author : P.L. Luisi
language : en
Publisher: Springer
Release Date : 2014-01-18
Reverse Micelles written by P.L. Luisi and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 2014-01-18 with Science categories.
Silicone Surfactants
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Author : Randall M. Hill
language : en
Publisher: CRC Press
Release Date : 1999-07-13
Silicone Surfactants written by Randall M. Hill and has been published by CRC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 1999-07-13 with Science categories.
"Serves as a comprehensive introduction to the preparation, uses, and physical chemistry of silicone surfactants--focusing on silicone polyoxyalkylene copolymers that are surface active in both aqueous and nonaqueous systems. Covers applications in the manufacture of polyurethane foam, coatings, wetting agents, fabric finishes, and polymer surface modifiers."
Multiscale Modeling Of Self Assembly And Phase Behavior Of Complex Fluids
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Author : Kyeong-jun Jeong
language : en
Publisher:
Release Date : 2020
Multiscale Modeling Of Self Assembly And Phase Behavior Of Complex Fluids written by Kyeong-jun Jeong and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2020 with categories.
Self-assembly and phase separation in mixtures are processes of great interest which provide large opportunities for designing novel nanomaterials. Since the aggregation behaviors are governed by noncovalent interactions and configurational entropy of molecules, computational modeling can shed light on the design principles by detecting molecular details beyond the resolution of experiments. We use molecular dynamics (MD) simulations to model bulk condensed matter systems, then inspect the topology and time evolution of the systems from atomic scales to nanometer scales for time of nanoseconds. We characterize the thermodynamic driving force of the association of ionic 'gemini' surfactants in water. We find that different headgroup electrostatics and size lead to qualitatively different intermolecular configurations of the surfactant associates, then discriminate whether the process is energetically or entropically driven. We also model low-symmetry packing phases comprised of spherical micelles of simple ionic surfactants. Here we notice the frustration of ideal packing by electrostatic interactions brings total inhomogeneity of structure and dynamics. These studies provide insight that the detailed topology and conditions of amphiphile self-assembly are hierarchically affected by chemical details of individual molecules and overall partitions of the system constituents. In another path, we utilize first-principles to develop force fields which can explicitly represent electronic polarizations as a response to environments. We demonstrate the polarization feature grants large benefits on the model transferability on hydrogen-bonding systems, regarding our applications on the urea/water mixture, and the choline chloride/urea mixture. Our new polarizable force field of urea is working well on both crystal and aqueous solution phases, and it is superior than nonpolarizable force field especially in the prediction of temperature-dependent solubility in water. Also, our choline chloride force field is combined with urea, and shows fair accuracy of predicting hydrogen bond network microstructure and self-diffusion of the bulk liquid. Thus, we conclude our studies enable comprehensive modeling of nanoscale processes while implementing chemical details with reasonable computational costs.
Application And Characterization Of Surfactants
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Author : Reza Najjar
language : en
Publisher: BoD – Books on Demand
Release Date : 2017-07-05
Application And Characterization Of Surfactants written by Reza Najjar and has been published by BoD – Books on Demand this book supported file pdf, txt, epub, kindle and other format this book has been release on 2017-07-05 with Science categories.
The surfactants are among the materials that have a significant importance in everyday life of human. The rapid growth in science and technology has opened new horizons in a very wide range, in which the surfactants play a major and vital role. Hence, the increasing number of applications as well as arising environmental issues has made this relatively old topic still a hot research theme. In the first section of this book, some of the applications of surfactants in various fields such as biology and petroleum industry, as well as their environmental effects, are described. In Section 2 some experimental techniques used for characterization of the surfactants have been discussed.
Wormlike Micelles
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Author : Cecile A Dreiss
language : en
Publisher: Royal Society of Chemistry
Release Date : 2017-03-21
Wormlike Micelles written by Cecile A Dreiss and has been published by Royal Society of Chemistry this book supported file pdf, txt, epub, kindle and other format this book has been release on 2017-03-21 with Science categories.
Wormlike Micelles describes the latest developments in the field including new systems, characterization and applications.
Giant Micelles
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Author : Raoul Zana
language : en
Publisher: CRC Press
Release Date : 2007-05-30
Giant Micelles written by Raoul Zana and has been published by CRC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2007-05-30 with Science categories.
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