Microscopic vs. macroscopic origin of the Lehmann effect in cholesteric liquid crystals.

The European Physical Journal. E, Soft Matter
Patrick Oswald

Abstract

In a recent letter (EPL 97, 36006 (2012)), we have shown that the Leslie thermomechanical coupling cannot alone explain the Lehmann effect (namely the rotation of cholesteric droplets when they are subjected to a temperature gradient). This result was obtained by measuring in a compensated cholesteric mixture the "Lehmann coefficient" as a function of temperature both below and at the transition to the isotropic liquid. In this article, we detail these experiments and present new ones performed with other compensated mixtures and a diluted cholesteric mixture. The new results confirm the macroscopic origin of the Lehmann effect, in contrast to the Leslie thermomechanical effect that is clearly of microscopic origin.

References

Apr 24, 2002·Physical Review. E, Statistical Physics, Plasmas, Fluids, and Related Interdisciplinary Topics·J BaudryP Oswald
Oct 4, 2003·Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics·O S TarasovL Kramer
Jul 23, 2008·Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics·Patrick Oswald, Alain Dequidt
Jul 23, 2008·Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics·Patrick OswaldAndrzej Zywociński
Nov 13, 2008·Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics·R K GuptaJ V Selinger

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Citations

Dec 25, 2016·The European Physical Journal. E, Soft Matter·Pawel PieranskiMallory Dazza
Jun 10, 2016·Physical Chemistry Chemical Physics : PCCP·Sten SarmanAatto Laaksonen
Apr 15, 2015·Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics·Patrick Oswald, Guilhem Poy
Apr 3, 2019·Physical Review. E·Takaki Yamamoto, Masaki Sano
Feb 13, 2020·The European Physical Journal. E, Soft Matter·P Oswald
Aug 16, 2016·Physical Review Letters·Jordi Ignés-MullolPatrick Oswald
Oct 8, 2016·Soft Matter·Alain DequidtPatrick Oswald
Oct 30, 2014·Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics·Patrick Oswald, Slavomir Pirkl

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