Eur. Phys. J. E 7, 163-166 (2002)
Flow properties of the optically isotropic tetrahedratic phaseH.R. Brand1, H. Pleiner2 and P.E. Cladis3
1 Theoretische Physik III, Universität Bayreuth, 95440 Bayreuth, Germany
2 Max-Planck-Institute for Polymer Research, POBox 3148, 55021 Mainz, Germany
3 Advanced Liquid Crystal Technologies, Summit, POB 1314, NJ 07902, USA
(Received 31 July 2001)
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.
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.
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag 2002