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Theory of elastic interaction between colloidal particles in the nematic cell in the presence of the external electric or magnetic field | | S. B. Chernyshuk
; O.M. Tovkach
; B. I. Lev
; | | Date: |
14 Sep 2011 | | Abstract: | The Green function method developed in Ref.[S. B. Chernyshuk and B. I. Lev,
Phys. Rev. E extbf{81}, 041707 (2010)] is used to describe elastic
interactions between axially symmetric colloidal particles in the nematic cell
in the presence of the external electric or magnetic field. General formulas
for dipole-dipole, dipole-quadrupole and quadrupole-quadrupole interactions in
the homeotropic and planar nematic cells with parallel and perpendicular field
orientations are obtained. A set of new results has been predicted: 1)
extit{Deconfinement effect} for dipole particles in the homeotropic nematic
cell with negative dielectric anisotropy $Deltaepsilon<0$ and perpendicular
to the cell electric field, when electric field is approaching it’s Frederiks
threshold value $ERightarrow E_{c}$. This means cancellation of the
confinement effect found in Ref. [M.Vilfan et al. Phys.Rev.Lett. {f 101},
237801, (2008)] for dipole particles near the Frederiks transition while it
remains for quadrupole particles. 2) New effect of extit{attraction and
stabilization} of the particles along the electric field parallel to the cell
planes in the homeotropic nematic cell with $Deltaepsilon<0$ . The minimun
distance between two particles depends on the strength of the field and can be
ordinary for . 3) Attraction and repulsion zones for all elastic interactions
are changed dramatically under the action of the external field. | | Source: | arXiv, 1109.3204 | | Services: | Forum | Review | PDF | Favorites | |
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