Odd-even effects of the polar anchoring strength in nematic liquid crystal on rubbed polyimide Langmuir-Blodgett films with alkyl chain lengths

Dae Shik Seo, Shunsuke Kobayashi, Michinori Nishikawa, Jae Hyung Kim, Yoshikazu Yabe

Research output: Contribution to journalArticlepeer-review

28 Citations (Scopus)

Abstract

The odd-even effect of the alkyl chain length of rubbed polyimide Langmuir-Blodgett (LB) films on the extrapolation length of 5CB has been successfully evaluated by measuring polar anchoring strength. The extrapolation length of 5CB for rubbed PI-LB films with even numbers is small compared with odd numbers for alkyl chain lengths of greater than 7 carbons. The extrapolation length of 5CB on rubbed PI-LB films with odd numbers increases gradually as the temperature increases but tends to diverge near the clearing temperature (Tc=35.3°C). The extrapolation length diverges because of rapidly decreasing surface order near Tc. It is suggested that the polar anchoring strength on rubbed PI-LB films with an even number is strong because of relatively high surface ordering caused by more crystalline surfaces. Finally, it is concluded that the odd-even effects of the polar anchoring strength in NLCs are strongly related to the character of the polymer and observed clearly for long alkyl chain lengths.

Original languageEnglish
Pages (from-to)1334
Number of pages1
JournalApplied Physics Letters
DOIs
Publication statusPublished - 1995

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)

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