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

Research output: Contribution to journalArticle

10 Citations (Scopus)

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

Fingerprint

Nematic liquid crystals
polyimides
Polyimides
Liquid crystals
Ion beams
ion beams
liquid crystals
alignment
incidence
Thermodynamic stability
Stabilization
tendencies
thermal stability
flux density
stabilization
trends

Keywords

  • Homeotropic
  • Ion beam
  • Nematic liquid crystal (NLC)
  • Polyimlde (PI)
  • Pretilt angle

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

Cite this

Liquid crystal alignment effects for nematic liquid crystal on homeotropic polyimide surface using new ion-beam source. / Kang, Dong Hun; Kim, Sang Hoon; Kim, Byoung Yong; Kim, Jong Yeon; Ok, Chul Ho; Kim, Young Hwan; Han, Jin Woo; Kim, Jong Hwan; Hwang, Jeoung Yeon; Oh, Byeong Yun; Han, Jeong Min; Lee, Sang Keuk; Lee, Jin Woo; Moon, Byung-Moo; Kim, Jae Hyung; Seo, Dae Shik.

In: Japanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers, Vol. 46, No. 10 A, 09.10.2007, p. 6601-6603.

Research output: Contribution to journalArticle

Kang, DH, Kim, SH, Kim, BY, Kim, JY, Ok, CH, Kim, YH, Han, JW, Kim, JH, Hwang, JY, Oh, BY, Han, JM, Lee, SK, Lee, JW, Moon, B-M, Kim, JH & Seo, DS 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, vol. 46, no. 10 A, pp. 6601-6603. https://doi.org/10.1143/JJAP.46.6601
Kang, Dong Hun ; Kim, Sang Hoon ; Kim, Byoung Yong ; Kim, Jong Yeon ; Ok, Chul Ho ; Kim, Young Hwan ; Han, Jin Woo ; Kim, Jong Hwan ; Hwang, Jeoung Yeon ; Oh, Byeong Yun ; Han, Jeong Min ; Lee, Sang Keuk ; Lee, Jin Woo ; Moon, Byung-Moo ; Kim, Jae Hyung ; Seo, Dae Shik. / Liquid crystal alignment effects for nematic liquid crystal on homeotropic polyimide surface using new ion-beam source. In: Japanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers. 2007 ; Vol. 46, No. 10 A. pp. 6601-6603.
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AU - Kim, Jong Hwan

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AU - Han, Jeong Min

AU - Lee, Sang Keuk

AU - Lee, Jin Woo

AU - Moon, Byung-Moo

AU - Kim, Jae Hyung

AU - Seo, Dae Shik

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AB - 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.

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