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A simple and inexpensive capillary furnace for variable‐temperature X‐ray diffraction
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In this article, an inexpensive capillary furnace has been developed for variable-temperature X-ray diffraction in transmission geometry of air-stable liquid crystals and other materials, which offers temperature control with fluctuations of less than ± 1Abstract:
An inexpensive capillary furnace has been developed for variable-temperature X-ray diffraction in transmission geometry of air-stable liquid crystals and other materials. It offers temperature control with fluctuations of less than ±1 K in the range of interest for these samples, from room temperature to near 573 K. Phases can be accessed through heating or cooling with no significant overshooting of the target temperature. The furnace is designed to fit on a classical goniometer, and can be controlled by any standard temperature controller. The simple design of this furnace means that it is both inexpensive to build and easy to operate.read more
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Self-assembly of discotic mesogens in solution and in liquid crystalline phases: effects of substituent position and hydrogen bonding.
TL;DR: Contrary to expectations, the presence of a carboxylic acid group on the side of the core does not appear to lead to the formation of dimeric structures in the liquid crystalline phase, although the columnar structures appear to be stabilized by intermolecular hydrogen bonding along the columns.
Journal ArticleDOI
Folded discotic dimers
TL;DR: A dibenzophenazine discotic dimer is found to adopt a folded conformation in solution, which allows the dimer to assemble into a columnar liquid crystal phase, despite its short linking group.
Journal ArticleDOI
Investigation into the role of the hydrogen bonding network in cyclodextrin-based self-assembling mesophases
Sandra Ward,Oliver Calderon,Ping Zhang,Matthew Sobchuk,Samantha N. Keller,Vance E. Williams,Chang-Chun Ling +6 more
TL;DR: A series of novel β-CD derivatives capable of forming hydrogen bonding networks of different strengths have been synthesized to probe the role of the hydrogen bonding network in the formation of self-assembled mesophases.
Journal ArticleDOI
Liquid crystalline lithium-ion electrolytes derived from biodegradable cyclodextrin
Pier-Luc Champagne,David Ester,Amit Bhattacharya,Kyle Hofstetter,Carson Zellman,Sourav Bag,Haoyang Yu,Simon Trudel,Vladimir K. Michaelis,Vance E. Williams,Venkataraman Thangadurai,Chang-Chun Ling +11 more
TL;DR: In this article, a thermotropic liquid crystalline (LC) cyclodextrin (CD) composites of self-assembling and environment-friendly amphiphilic β-CDs with lithium bistrifluoromethanesulfonimidate (LiTFSI) is reported.
Journal ArticleDOI
Synthesis and comparison of mesomorphic behaviour of a cholesterol-based liquid crystal dimer and analogous monomers
TL;DR: In this article, the synthesis and comparative studies of a synthetic liquid crystal dimer and two of its monomer analogues are presented, where a flexible scaffold consisting of a hybrid of non-polar hydrophobic chain and polar tetraethylene glycol appended to the cholesteryl mesogens.
References
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Journal ArticleDOI
Discotic Liquid Crystals: From Tailor-Made Synthesis to Plastic Electronics
Sabine Laschat,Angelika Baro,Nelli Steinke,Frank Giesselmann,Constanze Hägele,Giusy Scalia,Giusy Scalia,Roxana Judele,Elisabeth Kapatsina,Sven Sauer,Alina Schreivogel,Martin Tosoni +11 more
TL;DR: This Review will focus on the major classes of columnar mesogens rather than presenting a library of columner liquid crystals, and emphasis will be given to efficient synthetic procedures, and relevant mesomorphic and physical properties.
Journal ArticleDOI
Structural factors controlling the self-assembly of columnar liquid crystals
TL;DR: The observed trends can be rationalized in terms of the strength of pi-pi interactions between aromatic cores in the liquid crystalline phases and suggest that both electrostatic interactions and dispersion forces play important roles in the self-assembly of these materials.
Journal ArticleDOI
Self-assembly of hydrogen-bonded molecules: discotic and elliptical mesogens
TL;DR: In this paper, the effect of hydrogen bonding on the phase behaviour of discotic mesogens was investigated with a series of dibenzophenazine carboxylic acids and their methyl ester analogues.
Journal ArticleDOI
A 1300 K furnace for in situ X‐ray microtomography
TL;DR: In this article, a cylindrical symmetry X-ray microtomography furnace has been designed and constructed to study in situ the structural evolution of materials by using synchrotron Xray micro-tomography, compatible with the required 180° rotation, small dimensions and low absorption.
Journal ArticleDOI
Modular assembly of elliptical mesogens
Abstract: Discotic mesogens featuring a pyridine ring were synthesized, and were found either to form ordered hexagonal columnar liquid crystalline phases or melt directly from a crystal to an isotropic liquid, depending on the position of the pyridyl nitrogen atom. Binary mixtures of the mesogenic pyridine derivatives with a similar discotic mesogen having a carboxylic acid group resulted in the formation of modular elliptical complexes through hydrogen bonding. The binary mixtures were found to exhibit ordered hexagonal columnar or ordered rectangular columnar and nematic mesophases, depending on the length of the alkyl chains, and displayed dramatically different properties from their constituent components. Binary mixtures of the non‐mesogenic pyridine derivatives with carboxylic acid‐functionalized discotic mesogens did not result in the formation of hydrogen‐bonded complexes.
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