PMID: 15244838Jul 13, 2004Paper

Influence of the ions on the dynamical response of a nematic cell submitted to a dc voltage

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
M ScalerandiG Barbero

Abstract

The influence of the ions present in a liquid crystal on the dynamical response of a nematic slab submitted to a dc voltage is studied. The evolution of the system toward the equilibrium state is investigated by solving the continuity equation for the electric charge, taking into account the current of drift and of diffusion. Our analysis shows that the formation of the double layers close to the electrodes strongly modifies the distribution of the electric field across the sample. We evaluate the surface polarization due to the ions movements and the contribution to the anisotropic part of the surface energy having a dielectric origin. We show also that, even if the optical response of the liquid crystal is a slow phenomenon, the distribution of the ionic charge is rather fast. Consequently, the presence of the ions cannot be neglected in the determination of the flexoelectric coefficients when the nematic sample is submitted to a square wave having a period of the order of 1 s.

References

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Citations

Sep 3, 2016·The Review of Scientific Instruments·J E NoblesZ Celinski
Apr 12, 2006·Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics·A M GabovichA I Voitenko
Jun 29, 2006·Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics·F C M FreireM Scalerandi
Feb 7, 2007·Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics·G BarberoJ Le Digabel
Oct 10, 2006·Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics·G BarberoI Lelidis
Mar 19, 2013·Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics·K S KrishnamurthyM Vijay Kumar
Mar 3, 2020·The Review of Scientific Instruments·J E NoblesZ Celinski
Dec 27, 2005·The Journal of Physical Chemistry. B·M BecchiG Barbero
May 20, 2021·Physical Review. E·K S KrishnamurthyChannabasaveshwar V Yelamaggad
Sep 8, 2006·The Journal of Physical Chemistry. B·Giovanni BarberoAnca L Alexe-Ionescu

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