Homogeneous liquid crystal alignment on inorganic-organic hybrid silica thin films derived by the sol-gel method

Soo Sang Chae, Byoung Har Hwang, Woo Soon Jang, Jin Young Oh, Jee Ho Park, Se Jong Lee, Kie Moon Song, Hong Koo Baik

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Abstract

We developed an inorganic-organic hybrid thin film via the sol-gel method for a new liquid crystal alignment layer and investigated the influence of an organic species on the alignment characteristics of the liquid crystals (LCs). A thin film of methyl-doped amorphous silicon oxide (a-SiO x:CH 3) was fabricated from the hydrolysis and condensation reaction of the initial precursors of methyltriethoxysilane (MTES) and tetraethoxysilane (TEOS) at a proper ratio. A low-energy ion beam (IB) treatment gives rise to the homogeneous alignment of LC in an IB condition on a-SiO x:CH 3 thin film; however, it is difficult to control the LC alignment on a-SiO x thin film derived only from TEOS as a precursor. The LC alignment depending on the chemical structure of the silica thin film was investigated and analyzed in terms of the sensitivity of the axis-selective destruction of the chemical bonding on the surface of the thin silica film.

Original languageEnglish
Pages (from-to)1437-1442
Number of pages6
JournalSoft Matter
Volume8
Issue number5
DOIs
Publication statusPublished - 2012 Feb 7

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Condensed Matter Physics

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    Chae, S. S., Hwang, B. H., Jang, W. S., Oh, J. Y., Park, J. H., Lee, S. J., Song, K. M., & Baik, H. K. (2012). Homogeneous liquid crystal alignment on inorganic-organic hybrid silica thin films derived by the sol-gel method. Soft Matter, 8(5), 1437-1442. https://doi.org/10.1039/c1sm06592k