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

Dae Shik Seo, Chang Hoon Lee

Research output: Contribution to conferencePaper

Abstract

The odd-even effect of the alkyl chain length of rubbed polyimide (PI) Langmuir-Blodgett (LB) surfaces on the extrapolation length of 5CB has been successfully evaluated by measuring polar anchoring strength. The extrapolation length of 5CB for rubbed PI-LB surfaces 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 surfaces 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 surfaces 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 nematic liquid crystals (NLCs) are strongly related to the character of the polymer and observed clearly for long alkyl chain lengths.

Original languageEnglish
Pages603-605
Number of pages3
Publication statusPublished - 1997 Jan 1
EventProceedings of the 1997 5th IEEE International Conference on Properties and Applications of Dielectric Materials. Part 1 (of 2) - Seoul, Korea
Duration: 1997 May 251997 May 30

Other

OtherProceedings of the 1997 5th IEEE International Conference on Properties and Applications of Dielectric Materials. Part 1 (of 2)
CitySeoul, Korea
Period97/5/2597/5/30

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Materials Chemistry

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  • Cite this

    Seo, D. S., & Lee, C. H. (1997). Odd-even effects of the polar anchoring strength for nematic liquid crystal on polyimide Langmuir-Blodgett surfaces with alkyl chain lengths. 603-605. Paper presented at Proceedings of the 1997 5th IEEE International Conference on Properties and Applications of Dielectric Materials. Part 1 (of 2), Seoul, Korea, .