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Liquid crystal dynamics in the isotropic phase

Gottke, SD and Brace, David D and Hu, Cang and Bagchi, Biman and Fayera, MD (2002) Liquid crystal dynamics in the isotropic phase. In: Journal of Chemical Physics, 116 (1). pp. 360-367.


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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.

Item Type: Journal Article
Publication: Journal of Chemical Physics
Publisher: American Institute of Physics (AIP)
Additional Information: Copyright for this article belongs to American Institute of Physics (AIP)
Department/Centre: Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Date Deposited: 08 Jun 2004
Last Modified: 19 Sep 2010 04:12
URI: http://eprints.iisc.ac.in/id/eprint/84

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