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Fast relaxation mode in a thermotropic uniaxial nematic liquid crystal

Sanjay Tripathi, Hua Zhong, Rolfe G. Petschek, Charles Rosenblatt

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Abstract

Results are reported from a light scattering measurement in the uniaxial nematic phase in the thermotropic liquid crystal octylcyanobiphenyl, a material which does not exhibit a biaxial phase. In addition to a slow Goldstone mode associated with twist fluctuations, a fast mode whose relaxation time is independent of both wave vector and temperature has been observed. The possible origins of this relaxation are discussed.

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What this paper is about

Results are reported from a light scattering measurement in the uniaxial nematic phase in the thermotropic liquid crystal octylcyanobiphenyl, a material which does not exhibit a biaxial phase. In addition to a slow Goldstone mode associated with twist fluctuations, a fast mode whose relaxation time is independent of both wave vector and temperature has been observed. The possible origins of this relaxation are discussed.

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Available abstract

Results are reported from a light scattering measurement in the uniaxial nematic phase in the thermotropic liquid crystal octylcyanobiphenyl, a material which does not exhibit a biaxial phase. In addition to a slow Goldstone mode associated with twist fluctuations, a fast mode whose relaxation time is independent of both wave vector and temperature has been observed. The possible origins of this relaxation are discussed.

Key concepts: Thermotropic crystal, Liquid crystal, Materials science, Condensed matter physics, Relaxation (psychology), Twist, Phase (matter), Biaxial nematic

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