Dynamic light scattering study of biaxial ordering in a thermotropic liquid crystal |
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Authors: | Neupane K Kang S W Sharma S Carney D Meyer T Mehl G H Allender D W Kumar Satyendra Sprunt S |
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Affiliation: | Department of Physics, Kent State University, Kent, Ohio 44242, USA. |
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Abstract: | Dynamic light scattering from orientational order fluctuations in a liquid crystalline tetrapode reveals successive, weakly first-order isotropic to uniaxial and uniaxial to biaxial nematic phase transitions. The order parameter relaxation rates exhibit temperature dependences consistent with Landau-de Gennes mean field theory. Combined with previous evidence of a second-order uniaxial-biaxial transition in a closely related tetrapode, the present study supports the existence of a nematic-nematic tricritical point in thermotropic liquid crystals. |
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