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PhysRevE_64_03_1707
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論文情報
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
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
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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
24700053
citation_doi
info:doi/10.1103/PhysRevE.64.031707
citation_public_url
http://hdl.handle.net/11094/75861