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Showing 1 to 20 of 68 for “"Smectic"”.
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Instabilities in smectic A liquid crystals
In this thesis, the behaviour 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 …
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Mathematical Modelling of Smectic Liquid Crystals
… predict the behaviour of the physical system for smectic liquid crystals. Smectic liquid crystals are considered in various geometries including planar (Cartesian), cylindrical (i.e. polar) and spherical layered structures in uniform and irregularly contrasted domains. In these cases, strong and …
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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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Investigating the orientational order in smectic liquid crystals.
… subsequently 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 …
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MONODOMAIN SMECTIC LIQUID CRYSTALS OF MEMBRANE LIPID WITH MODEL ION CHANNELS
… patterns and orthoscopic images. The smectic defects which appeared during the alignment process were identified and dissolved. The incorporation of gramicidin in the multilayers in the form of the transmembrane channels was proven by its circular dichroism spectra (CD). The well …
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High-Resolution X-Ray and AC Calorimetric Studies of Smectic Liquid Crystals
Submitted by Carolyn Rauber (crauber2@illinois.edu) on 2011-06-03T18:16:57Z No. of bitstreams: 1 1981_kumar.pdf: 1926469 bytes, checksum: 446361757e83676cef97d6d5ccbac6ed (MD5)
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High resolution heat capacity studies near the nematic-smectic A phase transition
Submitted by Carolyn Mead (cmead2@illinois.edu) on 2011-06-20T19:14:36Z No. of bitstreams: 1 1980_legrange.pdf: 2275504 bytes, checksum: c8809627b31d2f6c7fc3caa04b8c1ed1 (MD5)
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Experimental investigations of the pretransition behavior near the nematic-smectic A phase transition
… dynamic pretransition behavior of the nematic-smectic A phase transition of the liquid crystal CBOOA. The first experiment is a conventional Rayleigh light scattering measurement performed with excellent temperature control of the liquid crystal. The second is a novel magneto-optic experiment …
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Theoretical studies of smectic liquid crystals in the presence of flow, oscillatory perturbations, and edge dislocations
… regarding the static and dynamic behaviour of smectic liquid crystals will be presented. The thesis is mainly concerned with the smectic A phase as modelled by the continuum theory of Stewart, though a working knowledge of the smectic C phase, modelled using the Leslie-Stewart-Nakagawa …
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Crossover to tricritical behavior at the nematic to smectic A transition : an X-ray scattering study
Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Physics, 1984.
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Theory of phase transitions in liquid crystals and plastic crystals
The properties of the layered, or smectic, liquid crystals are explained in terms of progressive freezing-out of rotational and translational degrees of freedom within each smectic plane. McMillan's dipole-dipole interaction model is extended to include intermolecular repulsions. In the …
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A molecular dynamics study of liquid crystal mixtures.
… system exhibits isotropic (/), nematic (N) and smectic-B (SmB) phases with both the I-N and N-SmB phase boundaries not clearly defined. Competition between two density waves parallel to the director of the same wavelength but different phase lead to a pre-smectic ordering preceding the N-SmB …
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Physics of liquid crystals embedded in silica gels
… quenched disorder. As a result, the nematic to smectic-A transition is replaced by the growth of static short range smectic correlations. The X-ray scattering profile has two contributions: a thermal fluctuation term which resembles that of the pure liquid crystal and a static fluctuation term …
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Instabilities in layered liquids induced by external fields
… in the macroscopic hydrodynamic description of smectic-A-like liquids leads to a number of interesting results. While the director and the layer normal are coupled such that they are parallel in equilibrium, in non-equilibrium situations, the director needs not be parallel to the smectic layer …
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The synthesis and properties of liquid crystals with bulky terminal groups for bookshelf geometry ferroelectric mixtures
… liquid crystals with bulky terminal chains, the smectic phase stability (particularly smectic C) is upheld by more than the nematic phase stability, and in most cases the smectic C phase stability is actually higher than comparable analogues with conventional unbranched terminal chains. It is …
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Quantum liquid crystal phases and unconventional magnetism in electronic and atomic fermi systems
… of the the McMillan- de Gennes theory of nematic-smectic thermal phase transition of classical liquid crystals to describe an analogous quantum phase transition in metallic systems. This theory qualitatively can also describe similar quantum phase transitions in high Tc superconductors. Recent …
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Investigation of a Design Strategy For Liquid Crystals with De Vries-Like Properties
… In applications the layer contraction at the smectic A-smectic C transition is a severe problem that leads to buckling of the smectic layers and results in zigzag defects that drastically degrade the optical quality of FLC films. To solve this problem, researchers are focusing on a new class …
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The relationship between the structure and physical properties of acylhydrazinatometallomesogens
… from the (usually uniaxial) nematic and smectic A phases indicates a degree of biaxiality within these phases. Furthermore, the tilt angle measured by x-rays within the smectic C phase decreases with chain length. A model is proposed for packing the molecules to account for both the …
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Morphology and self-assembly behavior of side chain liquid crystalline block copolymers
… backbone. Moieties that self-assemble into smectic liquid crystalline (LC) phases are covalently attached to the polystyrene-polyvinylmethylsiloxane (PS-PVMS) block copolymer backbone. Precise control over the functionalization of the LCs onto the functional siloxane backbone allows for …
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Heat capacity studies of phase transitions in a series of homologous liquid crystals using the AC heat capacity technique
… mK. This calorimeter has been used to study the smectic A-nematic phase transition in a series of homologous liquid crystals. In addition to pure CBOOA, measurements were made on mixtures of CBOOA and the next longer homolog, CBNOA. The character of the transition was found to change from first …
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