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Showing 1 to 20 of 205 for “"Liquid Crystals"”.
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Porphyrin liquid crystals
Made available in DSpace on 2011-05-07T12:58:15Z (GMT). No. of bitstreams: 2 license.txt: 4922 bytes, checksum: 910b249b4beec47e7ab768910c8f966f (MD5) 9712399.pdf: 6112917 bytes, checksum: 8710d51cba58a5e941a2d63d6e735ca7 (MD5) Previous issue date: 1996
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Quantum electronic liquid crystals
Submitted by Meng Tao (mengtao2@illinois.edu) on 2012-10-23T19:39:33Z No. of bitstreams: 1 Lawler_Michael.pdf: 904294 bytes, checksum: 70bd50160bc3ec456d63a22b6083297a (MD5)
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Interface Dynamics in liquid crystals
La dinámica de interfases es un tópico de estudio que ha suscitado mucho interés en distintos contextos tales como el magnetismo, dinámica de poblaciones, óptica, por mencionar algunos. Una interfase es un borde o superficie que conecta espacialmente dos estados de equilibrio y que puede exhibir …
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Thermodynamics of Micellar Lyotropic Liquid Crystals
Aqueous lyotropic liquid crystals (LLCs) comprise a class of ordered morphologies formed by self-assembly of amphiphiles in water. LLCs assume a variety of concentration- and temperature-dependent structures including lamellae (bilayers), bicontinuous networks, hexagonally-packed cylindrical …
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Instabilities in smectic A liquid crystals
… and stability of smectic A and smectic C liquid crystals are considered under the application of external influences. The behaviour of smectic A liquid crystals under oscillatory shear will be modelled using dynamic continuum theory recently developed by Stewart (2007). The dynamic …
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Mathematical Modelling of Smectic Liquid Crystals
Liquid crystals have received substantial research interest over the last century, especially when their beneficial applications such as liquid crystal displays were realised and developed. The changes to the molecular structure of liquid crystals can have a significant effect upon their synthesis …
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Liquid crystals for light emitting diodes
In this work a series of new semiconducting liquid crystals (LCs), which are applicable for organic light emitting diodes (OLEDs), were investigated. Semiempirical calculations were carried out on monomers and anti-cofacial dimers built from our molecules, representing molecules in solution and …
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Synthesis of metal containing liquid crystals
… wider mesophase range with a low crystal to liquid crystal transition temperatures (at or near room temperature). Insufficient amounts of these materials have been obtained to date for the ferroelectric properties to be examined. Attempts to synthesise complexes with 3'-fluoro substitutents …
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Nanopatterned anchoring layers for liquid crystals
… the theory and fabrication of inhomogeneous Liquid Crystal anchoring layers. While chemical anchoring techniques have proved useful for many applications, especially Liquid Crystal Displays, they have thus far been unable to demonstrate the ability to provide anchoring energy that varies with …
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High Birefringence And Low Viscosity Liquid Crystals
In this dissertation, liquid crystal (LC) materials and devices are investigated in order to meet the challenges for photonics and displays applications. We have studied three kinds of liquid crystal materials: positive dielectric anisotropic LCs, negative dielectric anisotropic LCs, and dual- …
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Generic planar lattice patterns in liquid crystals
… and pattern formation within a planar layer of liquid crystal. Some of the generic equilibrium patterns (steady states) on a square or hexagonal lattice that bifurcate from a homeotropic or planar isotropic state were calculated in Chillingworth and Golubitsky 2003 J. Mathematical Physics 44(9) …
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Structural studies of nonionic lyotropic liquid crystals
… resonance and x-ray and neutron scattering. The liquid crystalline phases have been characterized and their dimensional parameters determined. A phase diagram of C 16E06 has been produced covering the range of surfactant concentrations from 24 to 60% by weight. This system presented a nematic …
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Smectic phase transitions in chrial liquid crystals
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Physics, 1995.
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Nonlinear optical effects in nematic liquid crystals
… studies of nonlinear optical effects in nematic liquid crystals including degenerate four-wave mixing are presented. The optically induced Freedericksz transition which is essential for these effects is also described. Experimental investigations are performed using a homeotropically aligned MBBA …
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Optically induced orientational transitions in nematic liquid crystals
I have presented in this thesis a theoretical study of some dynamical phenomena and orientational transitions induced by intense light in homeotropically oriented nematic layers. A large number of experiments has been performed in such systems and various interesting dynamical regimes have been …
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Hydrogen Bonded Liquid Crystals from Fluorophenols and Alkoxystilbazoles
Hydrogen-bonded complexes between 4-alkoxy-4’-stilbazoles and phenols with different degrees of fluorine substitution were prepared. In contrast to the components, the complexes were observed to exhibit nematic and smectic A phases by polarised optical microscopy, and nematic tendency was found to …
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Investigating the orientational order in smectic liquid crystals.
… leads to the discovery of a novel Smectic-C liquid crystal phase. The 10OHFBBB1M7 (10OHF) compound shows a reversed phase sequence with the SmC∗ d4 phase occurring at a higher temperature than the SmC∗ phase. This phase sequence is stabilized by moderate doping of 9OTBBB1M7 (C9) or 11OTBBB1M7 …
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Nematic liquid crystals for nano-structured organic photovoltaic
A range of novel liquid crystals and amorphous organic conjugated semiconductors were synthesised by the chemistry branch of the Organophotonics group at Hull University. These compounds are studied electrochemically and optically to investigate the suitability of these materials as good …
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Flexo electro-optic Liquid Crystals for Phase Modulation
… 3D photonic structures such as blue phase liquid crystals have of great interest to the displays industry and are highly desirable as spatial light modulators because of their polarisation independence and fast switching. However, these types of devices suffer from multistep fabrication …
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Emission properties of radiative chiral nematic liquid crystals
… 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 and along the …
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