Download or read book Supramolecular Self assembly of Discotic Liquid Crystalline Supermolecules written by Jianjun Miao and published by . This book was released on 2009 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Self Assembled Supramolecular Architectures written by Nissim Garti and published by John Wiley & Sons. This book was released on 2012-08-15 with total page 503 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book will describe fundamentals and recent developments in the area of Self-Assembled Supramolecular Architecture and their relevance to the understanding of the functionality of membranes as delivery systems for active ingredients. As the heirarchial architectures determine their performance capabilities, attention will be paid to theoretical and design aspects related to the construction of lyotropic liquid crystals: mesophases such as lamellar, hexagonal, cubic, sponge phase micellosomes. The book will bring to the reader mechanistic aspects, compositional considerations, transition within phases, solubilization capacities, drug entrapment and release mechanisms and transmembrane, transdermal, and other transport phenomena. It will stress the importance of these mesostructures to crystallization and polymorphism of drugs, fats, and nutraceuticals and will discuss regioselectivity of organic and enzymatic reactions that take place at interfaces and within the channels of the mesophase. The book will bring studies on the use of these mesophase as crystallization or particulation media for the formation of nanoparticles and nanocrystals. Chapters will discuss applications in the areas of pharmaceuticals, food, cosmetics, plastics, paper, agro-chemistry and industrial applications.
Download or read book Physics And Chemistry Of Molecular Assemblies written by Kazuchika Ohta and published by World Scientific. This book was released on 2020-03-17 with total page 206 pages. Available in PDF, EPUB and Kindle. Book excerpt: The JLCS Excellent Book Award 2021 by Japanese Liquid Crystal SocietyIn nature, a number of molecules self-assemble to form various aggregation states. In these aggregation states, numerous functions, which have never been observed in one molecule, are developed. Even for the same compound, the different aggregation states exhibit totally different physical properties in density, hardness, optical and electrical properties, medicinal effect, etc. For pursuing the functionality of materials, it may be indispensable to understand the molecular aggregation states of crystals, liquid crystals, glass, colloids, etc. In this book, the author will focus on the basis of polymorphic phenomena of crystals and liquid crystals and their physical properties. After reading this book, you will be able to change your viewpoint of matter from traditional limited 'three states of matter' to novel 'numerous states of matter.'
Download or read book Liquid Crystals written by Tommaso Bellini and published by Springer Science & Business Media. This book was released on 2012-01-21 with total page 419 pages. Available in PDF, EPUB and Kindle. Book excerpt: Fluorinated Liquid Crystals: Design of Soft Nanostructures and Increased Complexity of Self-Assembly by Perfluorinated Segments, by Carsten Tschierske Liquid Crystalline Crown Ethers, by Martin Kaller and Sabine Laschat Star-Shaped Mesogens – Hekates: The Most Basic Star Structure with Three Branches, by Matthias Lehmann DNA-Based Soft Phases, by Tommaso Bellini, Roberto Cerbino and Giuliano Zanchetta Polar and Apolar Columnar Phases Made of Bent-Core Mesogens, by N. Vaupotič, D. Pociecha and E. Gorecka Spontaneous Achiral Symmetry Breaking in Liquid Crystalline Phases, by H. Takezoe Nanoparticles in Liquid Crystals and Liquid Crystalline Nanoparticles, by Oana Stamatoiu, Javad Mirzaei, Xiang Feng and Torsten Hegmann Stimuli-Responsive Photoluminescent Liquid Crystals, by Shogo Yamane, Kana Tanabe, Yoshimitsu Sagara and Takashi Kato
Download or read book Liquid Crystalline Functional Assemblies and Their Supramolecular Structures written by Takashi Kato and published by Springer Science & Business Media. This book was released on 2008-03-31 with total page 243 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents critical reviews of the present position and future trends in modern chemical research concerned with chemical structure and bonding. It contains short and concise reports, each written by the world's renowned experts. Still valid and useful after 5 or 10 years, more information as well as the electronic version of the whole content is available at: springerlink.com.
Download or read book Supramolecular Polymers written by Alberto Ciferri and published by CRC Press. This book was released on 2000-05-04 with total page 678 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Focuses on detailed analysis of the formation and properties of linear, planar, and three-dimensional polymer assemblies stabilized by superamolecular interactions, includes examples of covalently bonded polymers exhibiting novel supra-molecular effects. Clarifies the theoretical basis for the self-assembly of structures."
Download or read book Discotic Liquid Crystals Through Molecular Self assembly written by Changqing Yang and published by . This book was released on 1995 with total page 390 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Molecular Self Assembly written by Alex Li Dequan and published by CRC Press. This book was released on 2012-12-20 with total page 464 pages. Available in PDF, EPUB and Kindle. Book excerpt: In the past several decades, molecular self-assembly has emerged as one of the main themes in chemistry, biology, and materials science. This book compiles and details cutting-edge research in molecular assemblies ranging from self-organized peptide nanostructures and DNA-chromophore foldamers to supramolecular systems and metal-directed assemblies
Download or read book Chemistry of Discotic Liquid Crystals written by Sandeep Kumar and published by CRC Press. This book was released on 2016-04-19 with total page 512 pages. Available in PDF, EPUB and Kindle. Book excerpt: The self-contained properties of discotic liquid crystals (DLCs) render them powerful functional materials for many semiconducting device applications and models for energy and charge migration in self-organized dynamic functional soft materials. The past three decades have seen tremendous interest in this area, fueled primarily by the possibility
Download or read book Conformational Dynamics and Self assembly of Discotic Dimers written by Carson Zellman and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Disc-shaped (discotic) liquid crystals (DLCs) predominantly form columnar phases, which have been utilized as organic semiconductors in opto-electronic devices; yet these materials have been hampered by their thermal stability, often exhibiting liquid crystallinity at high and narrow temperature ranges. Discotic dimers, where two discotic moieties are tethered, overcome this hinderance through their unique ability to supercool and retain liquid crystallinity at device operating temperatures; however, the flexible linker that helps promote supercooling also makes dimers difficult to study - the dimer can adopt multiple conformations in equilibrium, including folded and extended structures. The effect these conformational dynamics have on the liquid crystal (LC) properties is still poorly understood. A series of dibenzo[a,c]phenazine diesters with subtle changes to the linking group were prepared and their conformational dynamics and self-assembly were probed. We observed a strong sensitivity between linker stereochemistry and supramolecular self-assembly. For a pair of 2,3-butyl dimers, the meso isomer, which extends more than its diastereomer, formed a substantially more thermally stable and ordered columnar phase. The different properties arose from differences in their conformational equilibria, as self-assembly from extended shapes was shown to stabilize and increase the order of the columnar hexagonal phase. In addition to the conformational equilibrium, the geometries had a significant impact on the supramolecular self-assembly. For a pair of 1,2-cyclohexyl diastereomers, one isomer was liquid crystalline, and the other was amorphous. The disparate phase behaviour stemmed from their unfolded shapes, as the mesogenic isomer formed an extended and fairly planar structure while the amorphous isomer could only adopt non-planar unfolded geometries. We also investigated the effect adjacent groups have on the conformational dynamics and self-assembly, as the majority of discotic dimers contain an ether group ortho to the linker. In discotic monomers, adjacent ether groups broadened and lowered the columnar thermal range through depression of the melting temperature and elevation of the clearing temperature. In dimers, the additional ether group deterred folding. While we anticipated this would enhance the columnar thermal stability, the opposite was observed. We discovered the adjacent ether group destabilizes the columnar phase from extended geometries. The ether group likely perturbs planarity in the columnar hexagonal array to some extent, highlighting again the importance of planarity for columnar self-assembly from extended shapes. Finally, the lessons learned from discotic dimer self-assembly was utilized to design discotic nematic materials. To promote the rarely observed phase, discotic dimers with a short direct ester bridge and an adjacent ether group were synthesized. The key was the non-planar, extended geometry, which allowed promotion of nematic ordering over columnar hexagonal assembly.
Download or read book Current Challenges on Large Supramolecular Assemblies written by Georges Tsoucaris and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 421 pages. Available in PDF, EPUB and Kindle. Book excerpt: The objectives of the ARW were: - identifying areas and highlighting approaches by which large Supramolecular (SM) Assemblies can be synthesised - reviewing and combining methods to characterise and analyse such assemblies. The first part of the ARW is devoted to reviewing synthetic achievements in recent years for several families of SM compounds, and to bringing out principles for crystal structure design, including novel quantum mechanical methods. Synthesis pertains both to the chemical synthesis of components for SM assembly, and to the subsequent assembly process based on complementarity and non-covalent interactions. The elaboration of multiple recognition "algorithms" concurrently employed (for instance, 1t-1t and hydrogen bonds) has recently reached a high degree of sophistication in the sequence: Molecules -7 Supermolecule -7 SM array -7 Crystal or Conglomerate Novel Large Assemblies comprise synthetic entities with molecular weight as high as 15000, and hybrid SM assemblies between synthetic molecules and DNA. Further developments are foreseen at a higher level of organisation, such as between supermolecules or with electromagnetic fields in photochemical processes. Creation of 2D Assemblies is now a powerful tool for creation and study of SM interactions. Moreover, much is to be learned in going from 2D to 3D assemblies in crystal growth and other forms of organisation such as micelles or liquid crystals. On the other hand, crystal engineering based on Molecular Recognition in the Crystal State leads to novel 2D assemblies occurring within predesigned crystal structures (hydrophobic organic clays or nanoporous networks).
Download or read book Self Assembly in Supramolecular Systems written by Ian M Atkinson and published by Royal Society of Chemistry. This book was released on 2007-10-31 with total page 235 pages. Available in PDF, EPUB and Kindle. Book excerpt: Molecular self-assembly is a widespread phenomenon in both chemistry and biochemistry. Yet it was not until the rise of supramolecular chemistry that attention has increasingly been given to the designed self-assembly of a variety of synthetic molecules and ions. To a large extent, success in this area has reflected knowledge gained from nature. However, an increased awareness of the latent steric and electronic information implanted in individual molecular components has also contributed to this success. Whilst not yet approaching the sophistication of biological assemblies, synthetic systems of increasing subtlety and considerable aesthetic appeal have been created. Self-Assembly in Supramolecular Systems surveys highlights of the progress made in the creation of discrete synthetic assemblies and provides a foundation for new workers in the area, as well as background reading for experienced supramolecular chemists.
Download or read book Supramolecular Chemistry and Self assembly written by Jack Halpern and published by . This book was released on 2002 with total page 452 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Molecular Recognition Directed Self Assembly of Supramolecular Liquid Crystals written by and published by . This book was released on 1994 with total page 62 pages. Available in PDF, EPUB and Kindle. Book excerpt: The first part of this paper discusses the molecular design of selected examples of structural units containing taper shaped exo-receptors and various crown ether, oligooxyethylenic and H-bonding based endo-receptors, which self-assemble into cylindrical channel-like architectures via principles resembling those of tobacco mosaic virus (TMV). The ability of these structural units to self-assemble via a delicate combination of exo- and endo-recognition processes will be presented. A comparison between various supramolecular (generated via H-bonding, ionic and electrostatic interactions) and molecular polymer backbones will be made. The formation of columnar hexagonal (Phi sub h), nematic and re-entrant isotropic phases by selected self-assembled systems will be discussed. The present limitations concerning the ability to engineer the structural parameters of these supramolecular channel-like architectures and some possible novel class of macrocyclics which self-assemble via intramolecular recognition processes into supramolecular 'rod-like' collapsed macrocyclics which display thermotropic liquid crystalline mesophases. It will be demonstrated that these macrocyclics have a higher ability to form liquid crystalline phases than the corresponding linear compounds which have identical or even higher degrees of polymerization. Therefore, they represent the ideal molecular architectures which generate nematic and smectic phases. The third part presents the concept and the synthesis of willow-like thermotropic dendrimers.
Download or read book Chiral Inductions on Supramolecular Self Assembly and Super Twisted Nematic Liquid Crystal Cells written by 雲緹 and published by . This book was released on 2017 with total page 93 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Unconventional Liquid Crystals and Their Applications written by Wei Lee and published by Walter de Gruyter GmbH & Co KG. This book was released on 2021-07-19 with total page 581 pages. Available in PDF, EPUB and Kindle. Book excerpt: The work focuses on recent developments of the rapidly evolving field of Non-conventional Liquid Crystals. After a concise introduction it discusses the most promising research such as biosensing, elastomers, polymer films , photoresponsive properties and energy harvesting. Besides future applications it discusses as well potential frontiers in LC science and technology.
Download or read book Part I Self assembling Dendrimers Using the DDA AAD Hydrogen Bonding Motif written by Yuguo Ma and published by . This book was released on 2003 with total page 128 pages. Available in PDF, EPUB and Kindle. Book excerpt: "In part I, a heterocyclic unit which contains complementary donor-donor-acceptor (DDA) and acceptor-acceptor-donor (AAD) (G-C-like) hydrogen bonding arrays at an angle of about 60° was used to self-assemble dendrimers into a hexamer. To investigate its ability to self-assemble higher generation dendrimers, second and third generation Fréchet-type dendron were attached to the 8-amino group the 2,8-diamino-2-N-ethylpyrimido-(4,5-b)[1,8] naphthyridine-3H-4-one subunit. Studies using 1H NMR, size exclusion chromatography (SEC) and dynamic light scattering (DLS) support the cooperative formation of cyclic hexamers in apolar solvents. The stability of the self-assembled dendrimers is dependent on the size of the attached dendron. Pair-wise mixing studies with different generation dendritic monomers indicate their usefulness in constructing dynamic combinatorial libraries. In part II, the ability of this heterocyclic unit to generate a self-assembled structure in bulk was tested by attachment of a 3,4,5-tris-dodecyloxybenzyl group to the 8-amino group and evaluating the mesomorphic properties of the resulting derivative. Cumulative solution studies by 1H NMR, SEC and DLS indicate the formation of a hydrogen bonded cyclic hexamer in apolar solvents. The studies by differential scanning calorimetry (DSC), polarized light microscopy (PLM) and X-ray diffraction (XRD) indicate that the hexameric disks can stack in bulk to form thermotropic columnar mesophases. The mesophases exist across a large temperature range (>248 °C)."--Page iii.
