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Liquid crystal dynamics in the isotropic phase

J. Chem. Phys. 116, 360 (2002); doi:10.1063/1.1423948

Issue Date: 1 January 2002

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S. D. Gottke, David D. Brace, and Hu Cang
Department of Chemistry, Stanford University, Stanford, California 94305

Biman Bagchi
Solid State and Structural Chemistry Unit, Indian Institute of Science, Bangalore 560 012, India

M. D. Fayer
Department of Chemistry, Stanford University, Stanford, California 94305
The dynamics in the isotropic phase of the liquid crystal 1-isothiocyanato-(4-propylcyclohexyl) benzene (3-CHBT) are investigated from very short time (~1 ps) to very long time (>100 ns) as function of temperature. The data decay exponentially only on the longest time scale (>10 ns). The temperature dependence of the long time scale exponential decays is described well by the Landau–de Gennes theory of the randomization of pseudo-nematic domains that exist in the isotropic phase of liquid crystals near the isotropic to nematic phase transition. Over the full range of times, the data are fit with a model function that contains a short time power law. The power law exponent is temperature independent over a wide range of temperatures. Integration of the function gives the empirical polarizability–polarizability (orientational) correlation function. A preliminary theoretical treatment of collective motions yields a correlation function that indicates that the data can decay as a power law at short times. The power law component of the decay reflects intradomain dynamics. ©2002 American Institute of Physics.
History: Received 24 July 2001; accepted 10 October 2001
Permalink: http://link.aip.org/link/?JCPSA6/116/360/1
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KEYWORDS and PACS

Keywords
PACS
  • 61.30.-v
    Structure of solids and liquids; crystallography Liquid crystals
  • 64.70.Md
    Equations of state, phase equilibria, and phase transitions Specific phase transitions Transitions in liquid crystals
  • YEAR: 2002

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ISSN:
0021-9606 (print)   1089-7690 (online)
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