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Flow properties of the optically isotropic tetrahedratic phase

By Società Italiana Di Fisica, H. R. Br, H. Pleiner and P. E. Cladis


Abstract. We discuss the coupling between flow and other hydrodynamic variables that can occur in the optically isotropic tetrahedratic phase (Td) characterized by a third rank tensor order parameter Tijk. We point out that an applied electric field or an applied temperature gradient will lead to flow. Reciprocally we predict that, for example, a shear flow applied to a tetrahedratic phase leads to an induced electric field and a temperature gradient. Similarities to recent experimental observations in the vicinity of the isotropic-B7 phase transitions in materials formed by banana-shaped molecules are discussed. PACS. 61.30.Gd Orientational order of liquid crystals; electric and magnetic field effects on order – 64.70.Md Transitions in liquid crystals – 05.70.Ln Nonequilibrium irreversible thermodynamics

Year: 2001
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