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

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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

All Science Journal Classification (ASJC) codes

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

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