Separate measurements of the flexoelectric and surface polarization in a model nematic liquid crystal p-methoxybenzylidene-p´-butylaniline : Validity of the quadrupolar approach

Blinov, Lev M.; Barnik, Mikhail I.; Ohoka, Hiroshi et al.

Physical Review E - Statistical Physics, Plasmas, Fluids, and Related Interdisciplinary Topics, 2001, 64(3), 031707-031707

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Identifier to cite or link to this item: https://hdl.handle.net/11094/75861

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Title
Separate measurements of the flexoelectric and surface polarization in a model nematic liquid crystal p-methoxybenzylidene-p´-butylaniline : Validity of the quadrupolar approach
Creator
CreatorName
Blinov, Lev M.
CreatorName
Barnik, Mikhail I.
CreatorName
Ohoka, Hiroshi
NRID
1000050204186 1000050204186
ORCID
0000-0002-9556-4225 0000-0002-9556-4225
researchmap permalink
read0014092 read0014092
Scopus Author ID
55490143900 55490143900
CreatorName
Ozaki, Masanori
NRID
1000070029205 1000070029205
CreatorName
Yoshino, Katsumi
Abstract
The temperature dependences of the surface polarization have been measured at the interface of a conductive glass with both the homogeneously and homeotropically oriented nematic liquid crystal p-methoxybenzylidene-p´-butylaniline. The polarization was found in the field-off regime from the pyroelectric response of a cell to a short laser pulse, absorbed in the bulk of the liquid crystal. The temperature increment was calculated from the measurements of the birefringence induced by the same light pulse. It has been shown that the surface polarization at the homeotropic (mh) and planar (mp) interfaces is directed from an interface into the bulk and from the bulk to an interface, respectively (with a magnitude mh~— 0.3 pC/m and mp' ≈ 0.2 pC/m at 25℃). The experimental data may be explained in terms of the quadrupole model of the order-electric polarization with account of some additional contribution from molecular dipoles. The same technique also allows for the measurements of the z component of the flexoelectric polarization using a pyroelectric response of a hybrid (homeoplanar) aligned nematic cell and proper subtracting of the surface contributions. The flexoelectric polarization has been shown to be opposite to the sum of the surface terms mh + mp and directed from the planar to homeotropic interface. This means that the sum of the flexoelectric coefficients e=(e1 + e3) is positive (e ≅ 1.7 pC/m at 28℃). The temperature dependence of e has been shown to involve a combination of both the quadrupolar and dipolar contributions.
Publisher
American Physical Society
Source Title
Physical Review E - Statistical Physics, Plasmas, Fluids, and Related Interdisciplinary Topics
Volume (Issue)
64(3)
Page
031707-031707
Date of Issued
2001-08-29
Language
English
Handle URL
https://hdl.handle.net/11094/75861
PISSN
24700045
eISSN
24700053
NCID
AA11558033
Relation.isIdenticalTo
DOI (Publisher Version)
https://doi.org/10.1103/PhysRevE.64.031707
Access Rights
open access
CopyRight
Copyright (2001) by the American Physical Society
oaire:version
Version of Record
Category
学術雑誌論文 Journal Article