Low Molecular Mass Gelators

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Low Molecular Mass Gelators

Author : Koji Araki
ISBN : 3540253211
Genre : Science
File Size : 50.67 MB
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With contributions be numerous experts.
Category: Science

Low Molecular Mass Gelators

Author : Frederic Fages
ISBN : 3540253211
Genre : Science
File Size : 60.90 MB
Format : PDF, Mobi
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With contributions be numerous experts.
Category: Science

Molecular Gels

Author : Richard G. Weiss
ISBN : 9781402036897
Genre : Science
File Size : 59.65 MB
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"Molecular Gels: Materials with Self-Assembled Fibrillar Networks" is a comprehensive treatise on gelators, especially low molecular-mass gelators and the properties of their gels. The structures and modes of formation of the self-assembled fibrillar networks (SAFINs) that immobilize the liquid components of the gels are discussed experimentally and theoretically. The spectroscopic, rheological, and structural features of the different classes of low molecular-mass gelators are also presented. Many examples of the application of the principal analytical techniques for investigation of molecular gels (including SANS, SAXS, WAXS, UV-vis absorption, fluorescence and CD spectroscopies, scanning electron, transmission electron and optical microscopies, and molecular modeling) are presented didactically and in-depth, as are several of the theories of the stages of aggregation of individual low molecular-mass gelator molecules leading to SAFINs. Several actual and potential applications of molecular gels in disparate fields (from silicate replication of nanostructures to art conservation) are described. Special emphasis is placed on perspectives for future developments. This book is an invaluable resource for researchers and practitioners either already researching self-assembly and soft matter or new to the area. Those who will find the book useful include chemists, engineers, spectroscopists, physicists, biologists, theoreticians, and materials scientists.
Category: Science

Gel Chemistry

Author : Jianyong Zhang
ISBN : 9789811068812
Genre : Science
File Size : 37.13 MB
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This book covers various molecular, metal-organic, dynamic covalent, polymer and other gels, focusing on their driving interactions, structures and properties. It consists of six chapters demonstrating interesting examples of these gels, classified by the type of driving interaction, and also discusses the effect of these interactions on the gels’ structures and properties. The book offers an interesting and useful guide for a broad readership in various fields of chemical and materials science.
Category: Science

Edible Oleogels

Author : Alejandro G. Marangoni
ISBN : 9780128142714
Genre : Technology & Engineering
File Size : 32.45 MB
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Edible Oleogels, Structure and Health Implications, Second Edition presents a novel strategy on how to eliminate trans fats from our diets. Topics covered include how to avoid excessive amounts of saturated fat by structuring oil to make it behave like crystalline fat and how to develop trans fat free, low saturate, functional shortenings for the food industry. The major approach to form these materials is covered, helping manufacturers incorporate specific molecules (polymers, amphiphiles, waxes) into oil components. As such, this an ideal resource for those in product development and anyone interested in understanding the role of trans and saturated fats in health and nutrition. In an effort to provide alternatives to trans and saturated fats, scientists have been busy modifying the physical properties of oils to resemble those of fats. Many food products requiring a specific texture and rheology can be made with these novel oil-based materials without causing significant changes to final product quality. Hence, this book provides a valuable resource on new advancements. Presents emerging science on beta gels using natural triglycerides, ethylcellulose oleogels, and oleotropic liquid crystals Suggests a novel strategy to eliminate trans fats from our diets and avoid excessive amounts of saturated fat by structuring oil to make it behave like crystalline fat Reviews the structuring of edible oils to form new mesoscale and nanoscale structures, including nanofibers, mesophases, and functionalized crystals and crystalline particles Identifies evidence on how to develop trans fat free, low saturate, functional shortenings for the food industry
Category: Technology & Engineering

Functional Molecular Gels

Author : Beatriu Escuder
ISBN : 9781849736657
Genre : Science
File Size : 41.93 MB
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Written by active researchers in the area, this book details the latest research on the field from fundamentals to applications.
Category: Science

Handbook Of Crystal Growth

Author : Tatau Nishinaga
ISBN : 9780444593764
Genre : Science
File Size : 27.1 MB
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Volume IA Handbook of Crystal Growth, 2nd Edition (Fundamentals: Thermodynamics and Kinetics) Volume IA addresses the present status of crystal growth science, and provides scientific tools for the following volumes: Volume II (Bulk Crystal Growth) and III (Thin Film Growth and Epitaxy). Volume IA highlights thermodynamics and kinetics. After historical introduction of the crystal growth, phase equilibria, defect thermodynamics, stoichiometry, and shape of crystal and structure of melt are described. Then, the most fundamental and basic aspects of crystal growth are presented, along with the theories of nucleation and growth kinetics. In addition, the simulations of crystal growth by Monte Carlo, ab initio-based approach and colloidal assembly are thoroughly investigated. Volume IB Handbook of Crystal Growth, 2nd Edition (Fundamentals: Transport and Stability) Volume IB discusses pattern formation, a typical problem in crystal growth. In addition, an introduction to morphological stability is given and the phase-field model is explained with comparison to experiments. The field of nanocrystal growth is rapidly expanding and here the growth from vapor is presented as an example. For the advancement of life science, the crystal growth of protein and other biological molecules is indispensable and biological crystallization in nature gives many hints for their crystal growth. Another subject discussed is pharmaceutical crystal growth. To understand the crystal growth, in situ observation is extremely powerful. The observation techniques are demonstrated. Volume IA Explores phase equilibria, defect thermodynamics of Si, stoichiometry of oxides and atomistic structure of melt and alloys Explains basic ideas to understand crystal growth, equilibrium shape of crystal, rough-smooth transition of step and surface, nucleation and growth mechanisms Focuses on simulation of crystal growth by classical Monte Carlo, ab-initio based quantum mechanical approach, kinetic Monte Carlo and phase field model. Controlled colloidal assembly is presented as an experimental model for crystal growth. Volume IIB Describes morphological stability theory and phase-field model and comparison to experiments of dendritic growth Presents nanocrystal growth in vapor as well as protein crystal growth and biological crystallization Interprets mass production of pharmaceutical crystals to be understood as ordinary crystal growth and explains crystallization of chiral molecules Demonstrates in situ observation of crystal growth in vapor, solution and melt on the ground and in space
Category: Science

Soft Fibrillar Materials

Author : Jing Liang Li
ISBN : 9783527648061
Genre : Science
File Size : 51.23 MB
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As one of the most important classes of soft materials, supramolecular materials are of a mixture of networks of molecular chains/fibrils and a liquid. These self-assembled fibrous/ molecular architectures exhibit various functionalities, ie. superhydrophobicity or superior mechanical strength, etc. and consist of the controllable structures. They can be functioned via micro/nano engineering, to have some particular added functions, ie. emission materials, tissue engineering scaffolds, bio imaging and sensing materials etc. They have therefore found broad applications in photography, cosmetics, food and petroleum industries and not the least in the biomedical sector where there is strong interest in these materials as drug delivery agents. The book covers the most important soft functional materials, including small molecule physical gels, silkworm silk and spider silk fibers and functional fibers, with respect both to the fundamentals and to development and engineering methods. It provides the reader with the necessary knowledge on the chemical and physical formation mechanisms of these materials and demonstrates that one can rationally design and tune the fibrillar networks so that the resulting materials exhibit the desired functionalities. This work is a must-have for all Materials Scientists, Polymer Chemists, Condensed Matter Physicists, and Biotechnologists working in this interdisciplinary field.
Category: Science

Investigation Of The Relationships Between The Thermodynamic Phase Behavior And Gelation Behavior Of A Series Of Tripodal Trisamide Compounds

Author : Li Feng (Chemical engineer)
ISBN : OCLC:1159001380
Genre : Colloids
File Size : 58.16 MB
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Low molecular weight organic gelators(LMOGs) are important due to potential applications in many fields. Currently, most of the major studies focus on the empirical explanation of the crystallization for gelator assembly formation and morphologies, few efforts have been devoted to the thermodynamic phase behaviors and the effect of the non-ideal solution behavior on the structure of the resultant gels. In this research, tripodal trisamide compounds, synthesized from tris(2-aminoethyl)amine (TREN) by condensation with different acid chlorides, were studied as model LMOGs due to the simple one-step reaction and the commercially available chemical reactants. Gelation of organic solvents was investigated as a function of concentration and solvent solubility parameter. It has been found that the introduction of branches or cyclic units have dramatically improves the gelation ability compared to linear alkyl peripheral units. Fitting the liquidus lines using the regular solution model and calculation of the trisamide solubility parameter using solubility parameter theory gave good agreement with the trisamide solubility parameter calculated by group contribution methods. These results demonstrate that non-ideal solution behavior is an important factor in the gelation behavior of low molecular mass organic gelators. Understanding and controlling the thermodynamics and phase behaviors of the gel systems will provide effective ways to produce new efficient LMOGs in the future.
Category: Colloids

Membranes And Molecular Assemblies

Author : Jürgen-Hinrich Fuhrhop
ISBN : 9780851867328
Genre : Technology & Engineering
File Size : 26.76 MB
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Membranes and Molecular Assemblies: The Synkinetic Approach contains 118 colour illustrations and a further 70 in black and white. Great care has been taken to choose graphics that illustrate difficult concepts. The book describes the wealth of membrane structures realized by chemists mainly within the last two decadesmicelles, vesicles, fibres, and surface monolayers - from the point of view of supramolecular chemistry. It puts new emphasis on "synkinetic" procedures for the preparation of non-covalent assemblies as well as their structural characterization by electron microscopy, solid state NMR spectroscopy, and comparison to X-ray crystal structures. The supramolecular structure of well-defined molecular assemblies and their use as complex reaction systems is also emphasized. Stereoselective surface recognition, asymmetric membranes, vectorial photoreactions, solid molecular bilayers in the form of tubules or helical rods, and sealable nanopores in membranes or on electrode surfaces are a few outstanding examples. In addition, the importance of well-defined gaps on surfaces and within membranes and crystals is discussed in context for the first time. Membranes and Molecular Assemblies will provide a fascinating read for graduates, researchers, and teachers in bio-organic chemistry, with interests in membranes and surface and colloid structure.
Category: Technology & Engineering

Self Assembly And Nanotechnology

Author : Lee
ISBN : STANFORD:36105131700416
Genre : Science
File Size : 63.73 MB
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This conceptual book delivers comprehensive coverage of key subjects in self-assembly nanotechnology. It provides clear schematic illustrations to represent the mainstream principles behind each topic. This feature makes this book an indispensable tool in bridging topics in nanotechnology including self-assembly, colloids, and surfaces. The book can also be used as a part of the teaching materials when the courses are joint-efforts across different disciplines or different departments, which are to cover a broader range of nanotechnology.
Category: Science

Core Concepts In Supramolecular Chemistry And Nanochemistry

Author : Jonathan W. Steed
ISBN : STANFORD:36105128373375
Genre : Science
File Size : 72.51 MB
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'Core Concepts in Supramolecular Chemistry and Nanochemistry' is a concise introduction to this fast developing subject. The book offers a modern up-to-date approach and carefully explains the basics and essential theory behind the subject.
Category: Science

Chemistry And Industry

Author :
ISBN : UCSD:31822022911705
Genre : Chemistry, Technical
File Size : 44.96 MB
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Category: Chemistry, Technical

Liquid Crystals

Author :
ISBN : UOM:39015048228822
Genre : Liquid crystals
File Size : 81.42 MB
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Category: Liquid crystals

Gelled Bicontinuous Microemulsions

Author : Michaela Laupheimer
ISBN : 9783319077192
Genre : Science
File Size : 25.44 MB
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Microemulsions and gels are well-known systems, which play a major role in colloidal and interfacial science. In contrast, the concept of gel microemulsions is still quite new. Gelled microemulsions are highly promising for microemulsion applications in which low viscosity is undesirable, such as administering a drug-delivering microemulsion to a certain area of the skin. It is essential to understand the properties of and structures formed in a system combining microemulsion components and a gelator. This PhD thesis by Michaela Laupheimer provides an in-depth discussion of the phase behavior and sol-gel transition of a microemulsion gelled by a low molecular weight gelator as well as the rheological behavior of a gelled bicontinuous microemulsion. Moreover, the microstructure of the gelled bicontinuous system is fully clarified using techniques like self-diffusion NMR and small angle neutron scattering (SANS). By comparing gelled bicontinuous microemulsions with corresponding non-gelled microemulsions and binary gels, it is demonstrated that bicontinuous microemulsion domains coexist with a gelator network and that the coexisting structures possess no fundamental mutual influence. Hence, gelled bicontinuous microemulsions have been identified as a new type of orthogonal self-assembled system.
Category: Science

Journal

Author : American Chemical Society
ISBN : NYPL:33433068514573
Genre : Chemistry
File Size : 56.43 MB
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Category: Chemistry