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Showing 1 to 13 of 13 for “"chiral nematic"”.
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Nanoparticle-chiral nematic liquid crystal composites
… by combing magnetooptical nanoparticles with a chiral nematic liquid crystal. The fabrication of this material system was advanced through two distinct phases of research. The first phase seeks to produce magnetooptical yttrium iron garnet (YIG) nanoparticles with an average diameter on the …
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Emission properties of radiative chiral nematic liquid crystals
… states (DOS) of the normal modes in dye-doped chiral nematic liquid crystal (LC) cells in the presence of various loss mechanisms. Losses and gain are incorporated into the transmission characteristics through the introduction of a small imaginary part in the dielectric constant perpendicular …
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Band edge lasing in chiral nematic liquid crystals
… years, there has been considerable interest in chiral nematic liquid crystal band edge lasers. The birefringent molecules of chiral nematic liquid crystals form a periodic helical structure, which results in a photonic bandgap for circularly polarised light with the same sense of rotation as the …
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The Flexoelectro-optic Effect for Photonics Applications
… the flexoelectro-optic effect, as observed in chiral nematic liquid crystals, and its potential for application in fibre optic communications components. The flexoelectro-optic effect provides a mechanism of fast, analogue rotation of the optic axis in chiral nematic materials via the …
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Novel chiral liquid crystal organic-inorganic hybrid nanoparticle systems : Design, synthesis and investigation
… based liquid crystals with chiral nematic mesophase at room temperature were obtained. Hybrid systems with very short pitch cholesteric phase and low transition temperatures were also prepared. A new method for preparing gold nanoparticles was implemented. The present results …
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Study of Hybrid Cellulose Nanocrystals in Polymeric Nanocomposites
… approximately similar order parameters. The chiral nematic CNC films successfully interlocked in a multilayer system while maintaining their structure with different visible color reflections. Through self-assembly, WCNC films displayed a chiral nematic structure. In order to develop …
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Linear and H-shaped chiral dimers for applications in photonic liquid crystals
… for low melting points. Thus, two sets of chiral dimers were synthesized, using different length chiral spacers, in the attempt to produce blue phases. The linear dimers exhibited crystal B phases, while the H-shaped dimers exhibited low temperature chiral nematic phases. The odd-even …
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Liquid crystal thermography and image processing in heat and fluid flow experiments
… colour records obtained using a thermosensitive chiral-nematic material combined with image processing. Application type experiments have been carried out both to visualise the complex distribution of temperature and local heat transfer coefficient over a cooled surface disturbed by different …
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I. Stereochemical Control of Chiral Assembly and Liquid Crystal Phase Formation of Nonamphiphilic Molecules in Water II. Control Bacterial Quorum Sensing and Quorum Sensing-mediated Activities Using Small Unnatural Molecules
… were designed and synthesized. The chiral stereoisomers formed chiral nematic liquid crystals while the achiral counterpart did not form any kind of liquid crystals. The hydrated assemblies of chiral 5´DSCG-diviol were able to interact with each other across a 6 nm separation in …
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Tunable organization of cellulose nanocrystals for controlled thermal and optical response
… iridescent optical reflection generated by chiral nematic organization. Shear oriented films disrupted the cholesteric organization, generating highly aligned structures with high optical transparency. The resultant CNC organization present in all nanostructured films was estimated by a …
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Liquid crystalline semiconductors for organic electronics
… materials. Many of these materials exhibit nematic phases, which is beneficial for alignment due to the lower viscosity present in the nematic phase compared to the smectic phase. Columnar LCs with low melting points were synthesised by variation of the aliphatic groups at the …
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The self-assembly of chitin nanocrystals into hierarchically structured functional materials
… nanoparticle concentrations and had smaller chiral nematic pitch in comparison to shrimp ChNC studied at comparable conditions. This broad investigation into the preparation conditions of ChNCs is the first of its kind; the field of cellulose nanocrystals is flourishing owing to comparable …
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Cellulose photonics: designing functionality and optical appearance of natural materials
Cellulose is the most abundant biopolymer on Earth as it is found in every plant cell wall; therefore, it represents one of the most promising natural resources for the fabrication of sustainable materials. In plants, cellulose is mainly used for structural integrity, however, some species organise …