Effects of rubbing and temperature dependence of polar anchoring strength of homogeneously aligned nematic liquid crystal on polyimide langmuir-blodgett orientation films

Dae-Shik Seo, Shunsuke Kobayashi, Dou Yol Kang, Hiroshi Yokoyama

Research output: Contribution to journalArticle

39 Citations (Scopus)

Abstract

The effect of rubbing on the polyimide (Pi) Langmuir-Blodgett (LB) surface-alignment films has been successfully evaluated by observing the temperature dependence of the polar anchoring strength of nematic liquid crystal 4-cyano-4-n-pentylbiphenyl (5CB). Upon rubbing, the PI-LB films showed a significant increase in the anchoring strength. The anchoring strength showed a nearly divergent decrease toward the clearing temperature, which is a manifestation of the diminished surface ordering, as previously pointed out for obliquely evaporated SiO films. Based on the van der Waals theory developed by Yokoyama et al. [J. Appl. Phys. 61 (1987) 4501], the intrinsic parts of the anchoring energy have been obtained as a function of temperature and found to undergo nearly one order of magnitude increase on rubbing. The polar anchoring energies for 5CB were strongly related to the surface order parameter on PI-LB films.

Original languageEnglish
Pages (from-to)3607-3611
Number of pages5
JournalJapanese Journal of Applied Physics
Volume34
Issue number7R
DOIs
Publication statusPublished - 1995 Jan 1

Fingerprint

Nematic liquid crystals
polyimides
Polyimides
Langmuir Blodgett films
liquid crystals
Langmuir-Blodgett films
temperature dependence
clearing
Temperature
alignment
temperature
energy

All Science Journal Classification (ASJC) codes

  • Engineering(all)
  • Physics and Astronomy(all)

Cite this

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title = "Effects of rubbing and temperature dependence of polar anchoring strength of homogeneously aligned nematic liquid crystal on polyimide langmuir-blodgett orientation films",
abstract = "The effect of rubbing on the polyimide (Pi) Langmuir-Blodgett (LB) surface-alignment films has been successfully evaluated by observing the temperature dependence of the polar anchoring strength of nematic liquid crystal 4-cyano-4-n-pentylbiphenyl (5CB). Upon rubbing, the PI-LB films showed a significant increase in the anchoring strength. The anchoring strength showed a nearly divergent decrease toward the clearing temperature, which is a manifestation of the diminished surface ordering, as previously pointed out for obliquely evaporated SiO films. Based on the van der Waals theory developed by Yokoyama et al. [J. Appl. Phys. 61 (1987) 4501], the intrinsic parts of the anchoring energy have been obtained as a function of temperature and found to undergo nearly one order of magnitude increase on rubbing. The polar anchoring energies for 5CB were strongly related to the surface order parameter on PI-LB films.",
author = "Dae-Shik Seo and Shunsuke Kobayashi and Kang, {Dou Yol} and Hiroshi Yokoyama",
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Effects of rubbing and temperature dependence of polar anchoring strength of homogeneously aligned nematic liquid crystal on polyimide langmuir-blodgett orientation films. / Seo, Dae-Shik; Kobayashi, Shunsuke; Kang, Dou Yol; Yokoyama, Hiroshi.

In: Japanese Journal of Applied Physics, Vol. 34, No. 7R, 01.01.1995, p. 3607-3611.

Research output: Contribution to journalArticle

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AU - Seo, Dae-Shik

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AB - The effect of rubbing on the polyimide (Pi) Langmuir-Blodgett (LB) surface-alignment films has been successfully evaluated by observing the temperature dependence of the polar anchoring strength of nematic liquid crystal 4-cyano-4-n-pentylbiphenyl (5CB). Upon rubbing, the PI-LB films showed a significant increase in the anchoring strength. The anchoring strength showed a nearly divergent decrease toward the clearing temperature, which is a manifestation of the diminished surface ordering, as previously pointed out for obliquely evaporated SiO films. Based on the van der Waals theory developed by Yokoyama et al. [J. Appl. Phys. 61 (1987) 4501], the intrinsic parts of the anchoring energy have been obtained as a function of temperature and found to undergo nearly one order of magnitude increase on rubbing. The polar anchoring energies for 5CB were strongly related to the surface order parameter on PI-LB films.

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