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:info:doi/10.1103/PhysRevE.64.031707

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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	Blinov, Lev M. Blinov, Lev M.
	Barnik, Mikhail I. Barnik, Mikhail I.
	Ohoka, Hiroshi Ohoka, Hiroshi
	Ozaki, Masanori Ozaki, Masanori
	Yoshino, Katsumi 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.
公開者	American Physical Society
掲載誌名	Physical Review E - Statistical Physics, Plasmas, Fluids, and Related Interdisciplinary Topics
巻	64
号	3
開始ページ	031707
終了ページ	031707
刊行年月	2001-08-29
ISSN	24700045
ISSN	24700053
NCID	AA11558033
DOI (出版社版)	info:doi/10.1103/PhysRevE.64.031707
URL	http://hdl.handle.net/11094/75861
権利情報	Copyright (2001) by the American Physical Society
言語	英語
カテゴリ	学術雑誌論文 Journal Article

著者版フラグ	publisher
NII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.64(3) P.031707-P.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	info:doi/10.1103/PhysRevE.64.031707
DC.identifier" scheme="DCTERMS.URI	http://hdl.handle.net/11094/75861
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
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_issn	24700045
citation_issn	24700053
citation_doi	info:doi/10.1103/PhysRevE.64.031707
citation_public_url	http://hdl.handle.net/11094/75861

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