Transactions on Electrical and Electronic Materials

The Korean Institute of Electrical and Electronic Material Engineers (한국전기전자재료학회)
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Homeotropic Alignment Effect of a Nematic Liquid Crystal on Oblique Deposited SiOx Thin-film with e-beam Evaporation

  • Published : 2007.12.31
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Abstract

In this study, liquid crystal(LC) aligning capabilities for homeotropic alignment on the $SiO_x$ thin film by electron beam evaporation method were investigated. Also, the control of pretilt angles and thermal stabilities of the nematic liquid crystal(NLC) treated on $SiO_x$ thin film were investigated. A high pretilt angle of about $86.5^{\circ}$ was obtained, and also the suitable pretilt angle of the NLC on the $SiO_x$ thin film at $10{\sim}50nm$ thickness with e-beam evaporation can be achieved. The uniform LC alignment and good thermal stabilities on the $SiO_x$ thin film surfaces with electron beam evaporation can be achieved. It is considered that the LC alignment on the $SiO_x$ thin film by electron beam evaporation is attributed to elastic interaction between LC molecules and micro-grooves at the $SiO_x$ thin film surface created by evaporation.

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References

  1. D.-S. Seo, K. Muroi, and S. Kobayashi, 'Generation of pretilt angle in nematic liquid crystal, 5CB, media aligned polyimide films prepared by spincoating and LB techniques : effects of rubbing', Mol. Cryst. Liq. Cryst., Vol. 213, p. 223, 1992
  2. D.-S. Seo, T. Oh-ide, and S. Kobayashi, 'Observation of the surface structure on as stacked and rubbed polyimide (PI)-LB films with an atomic force microscope and their anchoring capability for nematic liquid crystals', Mol. Cryst. Liq. Cryst., Vol. 214, p. 97, 1992
  3. B. O. Myrvold and K. Kondo, 'A population distribution model for the alignment of nematic liquid crystals', Liq. Cryst., Vol. 17, p. 437, 1994
  4. R. Arafune, K. Sakamoto, S. Ushioda, S. Tanioka, and S. Murata, 'Importance of rubbing-induced inclination of polyimide backbone structures for determination of the pretilt angle of liquid crystals', Phys. Rev. E., Vol. 58, p. 5914, 1998
  5. D.-S. Seo, S. Kobayashi, D.-Y. Kang, and H. Yokoyama, 'Effects of rubbing and temperature dependence of polar anchoring strength of homogeneously aligned nematic liquid crystal on polyimide Langmuir-Blodgett orientation films', Jpn. J. Appl. Phys., Vol. 34, p. 3607, 1995
  6. H. Matsuda, D.-S. Seo, N. Yoshida, K. Fujibayashi, and S. Kobayashi, 'Estimation of the static electricity and optical retardation produced by the rubbing polyimide and polyamide films with different fabrics', Mol. Cryst. Liq. Cryst., Vol. 264, p. 23, 1995
  7. P. Chaudharl, J. Lacey, J. Doyle, E. Galligan, S. C. Alan, A. Callegarl, G. Hougham, N. D. Lang, P. S. Andry, R. John, K. H. Yang, M. Lu, C. Cal, J. Speidell, S. Purushothaman, J. Ritsko, M. Samnt, J. Stohrt, Y. Nakagawa, Y. Katoh, Y. Saitoh, K. Saka, H. Satoh, S. Odahara, H. Nakano, J. Nskshski, and Y. Shiota, 'Atomic-beam alignment of inorganic materials for liquid-crystal displays', Nature, Vol. 411, p. 56, 2001
  8. D.-H. Kang, S.-H. Kim, B.-Y. Kim J.-Y. Kim, C.-H. Ok, Y.-H. Kim, J.-W. Han, J.-H. Kim, J.-Y. Hwang, B.-Y. Oh, J.-M. Han, S.-K. Lee, J.-W. Lee, B.-M. Moon, J.-H. Kim, and D.-S. Seo, 'Liquid crystal alignment effects for nematic liquid crystal on homeotropic polyimide surface using new ion-beam source', Jpn. J. Appl. Phys., Vol. 46, p. 6601, 2007 https://doi.org/10.1143/JJAP.46.6601
  9. J.-M. Han, S.-H. Choi, B.-Y. Kim, J.-W. Han, J.-Y. Hwang, C.-H. Ok, and D.-S. Seo, 'Homeotropic alignment effects for nematic liquid crystal on the SiOx thin film layer by new ion beam exposure', Trans. EEM, Vol. 7, No. 6, p. 293, 2006 https://doi.org/10.4313/TEEM.2006.7.6.293
  10. Y.-M. Jo, J.-Y. Hwang, D.-S. Seo, and S.-K. Lee, 'Alignment effects for nematic liquid crystal on a new diamond-like carbon layer', Trans. EEM, Vol. 3, No. 2, p. 1, 2002
  11. J.-H. Kim, H.-K. Kang, J.-W. Han, S.-H. Kang, Y.-H. Kim, J.-Y. Hwang, and D.-S. Seo, 'LC aligning properties for homeotropic alignment of NLC on the $SiO_{x}$ thin film as incident angle of electron beam evaporation angle', Trans. EEM, Vol. 7, No. 1, p. 21, 2006 https://doi.org/10.4313/TEEM.2006.7.1.021