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; Ozaki, Masanori; Yoshino, Katsumi

doi:https://doi.org/10.1103/PhysRevE.64.031707

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

アクセス数:324件（2025-07-04 15:32 集計）

固定URL: https://hdl.handle.net/11094/75861

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タイトル	Separate measurements of the flexoelectric and surface polarization in a model nematic liquid crystal p-methoxybenzylidene-p´-butylaniline : Validity of the quadrupolar approach
著者	著者名 Blinov, Lev M.
	著者名 Barnik, Mikhail I.
	著者名 Ohoka, Hiroshi
	NRID 1000050204186 1000050204186 ORCID 0000-0002-9556-4225 0000-0002-9556-4225 researchmap permalink read0014092 read0014092 Scopus Author ID 55490143900 55490143900 著者名 Ozaki, Masanori
	NRID 1000070029205 1000070029205 著者名 Yoshino, Katsumi
抄録	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.
出版者	American Physical Society
収録物名	Physical Review E - Statistical Physics, Plasmas, Fluids, and Related Interdisciplinary Topics
巻(号)	64(3)
ページ	031707-031707
刊行年月	2001-08-29
言語	英語
ハンドルURL	https://hdl.handle.net/11094/75861
PISSN	24700045
eISSN	24700053
NCID	AA11558033
関連情報 (isIdenticalTo)	DOI (出版社版) https://doi.org/10.1103/PhysRevE.64.031707
アクセス権	open access
権利情報	Copyright (2001) by the American Physical Society
出版タイプ	Version of Record
カテゴリ	学術雑誌論文 Journal Article

資源タイプ	学術雑誌論文
ローカル資源タイプ	学術雑誌論文
DCTERMS.bibliographicCitation	Physical Review E - Statistical Physics, Plasmas, Fluids, and Related Interdisciplinary Topics. 2001, 64(3), p. 031707-031707
DC.title	Separate measurements of the flexoelectric and surface polarization in a model nematic liquid crystal p-methoxybenzylidene-p´-butylaniline : Validity of the quadrupolar approach
DC.creator	Blinov, Lev M.
	Barnik, Mikhail I.
	Ohoka, Hiroshi
	Ozaki, Masanori
	Yoshino, Katsumi
DC.publisher	American Physical Society
DC.language' scheme='DCTERMS.RFC1766	英語
DCTERMS.issued' scheme='DCTERMS.W3CDTF	2001-08-29
DC.identifier	https://doi.org/10.1103/PhysRevE.64.031707
DCTERMS.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.
DC.rights	Copyright (2001) by the American Physical Society
DC.format	75861
citation_title	Separate measurements of the flexoelectric and surface polarization in a model nematic liquid crystal p-methoxybenzylidene-p´-butylaniline : Validity of the quadrupolar approach
citation_author	Blinov, Lev M.
	Barnik, Mikhail I.
	Ohoka, Hiroshi
	Ozaki, Masanori
	Yoshino, Katsumi
citation_publisher	American Physical Society
citation_language	英語
citation_date	2001-08-29
citation_journal_title	Physical Review E - Statistical Physics, Plasmas, Fluids, and Related Interdisciplinary Topics
citation_volume	64
citation_issue	3
citation_firstpage	031707
citation_lastpage	031707
citation_doi	https://doi.org/10.1103/PhysRevE.64.031707
citation_public_url	https://hdl.handle.net/11094/75861

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

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