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Elastic monopoles and external torques in nematic liquid crystal colloids | | O. M. Tovkach
; S. B. Chernyshuk
; B.I.Lev
; | | Date: |
19 Nov 2013 | | Abstract: | Up to now it is commonly believed that a colloidal particle suspended in a
nematic liquid crystal never produces elastic monopoles because this violates
the mechanical equilibrium condition. And the only way to obtain deformations
of director field falling off with distance as r^{-1} is to exert an external
torque Gamma_{ext} on the colloid cite{de_Gennes}. In this paper we
demonstrate that this statement is not quite correct and elastic monopoles, as
well as dipoles and quadrupoles, can be induced without any external influence
just by the particle itself. A behavior of a spherical colloidal particle with
asymmetric anchoring strength distribution is considered theoretically. It is
demonstrated that such a particle when suspended in a nematic host can produce
director deformations decreasing as $r^{-1}$, i.e. elastic monopoles, by itself
without any external influence. | | Source: | arXiv, 1311.4593 | | Services: | Forum | Review | PDF | Favorites | |
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