Surface oxidation and charge transfer inducing dipole-dipole interactions for homogeneous liquid crystal orientation

Jeong Hwan Kim, Young Gu Kang, Ji Hun Lim, Byeong Yun Oh, Hong Gyu Park, Byoung Yong Kim, Young Hwan Kim, Chul Ho Ok, Jeong Yeon Hwang, Jeong Min Han, Sung Ho Kim, Tae Kyu Park, Dae Shik Seo

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Generally, liquid crystal (LC) orientation on rubbed polystyrene (PS) surfaces runs in the direction orthogonal to the rubbing process. In this study, homogeneous LC orientations were produced in the direction parallel to the ion beam (IB) process on PS surfaces using various IB exposure energies. Through x-ray photoelectron spectroscopy it was shown that IB irradiation resulted in the reformation of O=C bonds resulting from surface oxidation or charge transfer, reversely tracing out the produced pretilt angles of the homogeneous LC. Moreover, thermal tests on IB-irradiated PS surfaces were carried out which showed that a relatively high IB exposure energy induced a thermally stable LC alignment property. Finally, we determined the mechanism by which homogeneous LCs are aligned on IB-irradiated PS surfaces with electro-optical properties of twisted-nematic LC cells.

Original languageEnglish
Article number225302
JournalJournal of Physics D: Applied Physics
Volume43
Issue number22
DOIs
Publication statusPublished - 2010 Jun 3

Fingerprint

Liquid Crystals
Crystal orientation
Liquid crystals
Ion beams
Charge transfer
Polystyrenes
ion beams
liquid crystals
charge transfer
dipoles
Oxidation
oxidation
polystyrene
interactions
Nematic liquid crystals
Photoelectron spectroscopy
tracing
x ray spectroscopy
Optical properties
alignment

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Acoustics and Ultrasonics
  • Surfaces, Coatings and Films

Cite this

Kim, Jeong Hwan ; Kang, Young Gu ; Lim, Ji Hun ; Oh, Byeong Yun ; Park, Hong Gyu ; Kim, Byoung Yong ; Kim, Young Hwan ; Ok, Chul Ho ; Hwang, Jeong Yeon ; Han, Jeong Min ; Kim, Sung Ho ; Park, Tae Kyu ; Seo, Dae Shik. / Surface oxidation and charge transfer inducing dipole-dipole interactions for homogeneous liquid crystal orientation. In: Journal of Physics D: Applied Physics. 2010 ; Vol. 43, No. 22.
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Kim, JH, Kang, YG, Lim, JH, Oh, BY, Park, HG, Kim, BY, Kim, YH, Ok, CH, Hwang, JY, Han, JM, Kim, SH, Park, TK & Seo, DS 2010, 'Surface oxidation and charge transfer inducing dipole-dipole interactions for homogeneous liquid crystal orientation', Journal of Physics D: Applied Physics, vol. 43, no. 22, 225302. https://doi.org/10.1088/0022-3727/43/22/225302

Surface oxidation and charge transfer inducing dipole-dipole interactions for homogeneous liquid crystal orientation. / Kim, Jeong Hwan; Kang, Young Gu; Lim, Ji Hun; Oh, Byeong Yun; Park, Hong Gyu; Kim, Byoung Yong; Kim, Young Hwan; Ok, Chul Ho; Hwang, Jeong Yeon; Han, Jeong Min; Kim, Sung Ho; Park, Tae Kyu; Seo, Dae Shik.

In: Journal of Physics D: Applied Physics, Vol. 43, No. 22, 225302, 03.06.2010.

Research output: Contribution to journalArticle

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AU - Kang, Young Gu

AU - Lim, Ji Hun

AU - Oh, Byeong Yun

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AU - Kim, Byoung Yong

AU - Kim, Young Hwan

AU - Ok, Chul Ho

AU - Hwang, Jeong Yeon

AU - Han, Jeong Min

AU - Kim, Sung Ho

AU - Park, Tae Kyu

AU - Seo, Dae Shik

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