Liquid crystal alignment effects for nematic liquid crystal on homeotropic polyimide surface using new ion-beam source

Dong Hun Kang, Sang Hoon Kim, Byoung Yong Kim, Jong Yeon Kim, Chul Ho Ok, Young Hwan Kim, Jin Woo Han, Jong Hwan Kim, Jeoung Yeon Hwang, Byeong Yun Oh, Jeong Min Han, Sang Keuk Lee, Jin Woo Lee, Byung Moo Moon, Jae Hyung Kim, Dae Shik Seo

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Abstract

We have studied the liquid crystal (LC) alignment and tilt angle generation of a nematic liquid crystal (NLC) on a homeotropic polyimide (PI) surface using a new ion beam source. The tilt angle of the NLC on the homeotropic PI surface for all incident angles is about 38° and this angle has a stabilization trend. A good LC alignment of the NLC on the homeotropic PI surface by to exposure ion beam of 45° incidence angle was observed. Also, the tilt angle of the NLC on the homeotropic PI surface by to exposure ion beam of 45° incidence angle had a tendency to decrease as ion beam energy density increased. Thus, we demonstrated that the tilt angle could be controlled from vertical to horizontal directions. Also, the alignment character of the NLC on the homeotropic PI surface with respect to ion beam energy was good at more than 1500 eV. Finally, a superior LC alignment thermal stability on the homeotropic PI surface subject to ion beam exposure was achieved.

Original languageEnglish
Pages (from-to)6601-6603
Number of pages3
JournalJapanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers
Volume46
Issue number10 A
DOIs
Publication statusPublished - 2007 Oct 9

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All Science Journal Classification (ASJC) codes

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

Cite this

Kang, D. H., Kim, S. H., Kim, B. Y., Kim, J. Y., Ok, C. H., Kim, Y. H., Han, J. W., Kim, J. H., Hwang, J. Y., Oh, B. Y., Han, J. M., Lee, S. K., Lee, J. W., Moon, B. M., Kim, J. H., & Seo, D. S. (2007). Liquid crystal alignment effects for nematic liquid crystal on homeotropic polyimide surface using new ion-beam source. Japanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers, 46(10 A), 6601-6603. https://doi.org/10.1143/JJAP.46.6601