About the Leslie explanation of the Lehmann effect in cholesteric liquid crystals
Université de Lyon, Ecole Normale Supérieure de Lyon, Laboratoire de Physique, UMR 5672 of the CNRS 46 Allée d'Italie, 69364 Lyon Cedex 07, France, EU
Accepted: 2 January 2012
By measuring as a function of temperature the Leslie thermomechnical coefficient in a compensated cholesteric mixture, we arrived at the conclusion that the Lehmann effect, namely the rotation of cholesteric droplets under the action of a temperature gradient, cannot be explained only by the Leslie thermomechanical coupling effect.
PACS: 61.30.-v – Liquid crystals / 05.70.Ln – Nonequilibrium and irreversible thermodynamics / 65.40.De – Thermal expansion; thermomechanical effects
© EPLA, 2012