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Order parameters of liquid crystal on the rubbing surfaces of alignment layers

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Abstract

Liquid crystal (LC) alignment is most important in LC devices. In this paper, we quantitatively analyze the LC scalar order parameters on the rubbed surface of an alignment layer. Careful measurement of dichroic infrared absorbance is performed. The result gives the evidence that the order parameter of LC just on the rubbed alignment film is only 1/3–1/2 that in the LC bulk.

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References

  1. Gibbons, W. M., Shannon, P. J., Sun, S. T. et al., Surface-mediated alignment of nematic liquid-crystals with polarized laser-light, Nature, 1991, 351: 49–50.

    Article  Google Scholar 

  2. Tang, Y. X., Liu, D. G., Xie, P. et al., Photo-driven liquid crystal cell using azobenzene-grafted ladder like polysiloxane as command layer, Macromol. Rapid Commun., 1996, 17(11): 759–766.

    Article  Google Scholar 

  3. Tian, Y. Q., Ren, Y. Z., Sun, R. P. et al., Synthesis of a series of chiral copolymers with azo groups and investigations of reversible liquid crystalline alignment induced by the LB films of these materials, Liquid Crystals, 1997, 22 (2): 177–183.

    Article  Google Scholar 

  4. Mullin, C. S., Guyotsionnest, P., Shen, Y. R., Properties of liquid-crystal monolayers on silane surfaces, Phys. Rev. A, 1989, 39 (7): 3745–3747.

    Article  Google Scholar 

  5. Chen, W., Feller, M. B., Shen, Y. R., Investigation of anisotropic molecular orientational distributions of liquid-crystal monolayers by optical 2nd-harmonic generation, Phys. Rev. Lett., 1989, 63 (24): 2665–2668.

    Article  Google Scholar 

  6. Ouchi, Y., Feller, M. B., Moses, T. et al., Surface memory effect at the liquid-crystal-polymer interface, Phys. Rev. Lett., 1992, 68(20): 3040–3043.

    Article  Google Scholar 

  7. Lee, E. S., Vetter, P., Miyasita, T. et al., Control of liquid-crystal alignment using stamped-morphology method, J. J. Appl. Phys. Part 2-Letters, 1993, 32(10A): L1436-L1438.

    Article  Google Scholar 

  8. Sakamoto, K., Arafune, R., Ito, N. et al., Determination of molecular orientation of very thin rubbed and unrubbed polyimide films, J. Appl. Phys., 1996, 80(1): 431–439.

    Article  Google Scholar 

  9. Hanson, E. G., Shen, Y. R., Refractive-indexes and optical anisotropy of homologous liquid-crystals, Molecular Crystals and Liquid Crystals, 1976, 36(3–4): 193–207.

    Article  Google Scholar 

  10. Hsiung, H., Rasing, T., Shen, Y. R., Wall-induced orientational order of a liquid-crystal in the isotropic-phase—an evanescent-wave-ellipsometry study, Phys. Rev. Lett., 1986, 57(24): 3065–3068.

    Article  Google Scholar 

  11. Moses, T., Shen, Y. R., Pretransitional surface ordering and disordering of a liquid-crystal, Phys. Rev. Lett., 1991, 67(15): 2033–2036.

    Article  Google Scholar 

  12. Chen, W., Martinezmiranda, L. J., Hsiung, H., Orientational wetting behavior of a liquid-crystal homologous series, Phys. Rev. Lett., 1989, 62 (16): 1860–1863.

    Article  Google Scholar 

  13. Ueno, H., Xuan, L., Tohyama, T. et al., Mechanism of Molecular Alignment on the Rubbed Surface, SID, Canada, Sep. 1997, L18.

    Google Scholar 

  14. Ueno, H., Xuan, L., Miyashita, T. et al., The alignment order of liquid crystal at the surface layer, International Liquid Crystal Conference, Strasbourg, France, July 1998, (P2): 176–179.

  15. Uchida, T., Hirano, M., Sakai, H., Director orientation of a ferroelectric liquid-crystal on substrates with rubbing treatment—the effect of surface anchoring strength, Liquid Crystals, 1989, 5(4): 1127–1137.

    Article  Google Scholar 

  16. Sato, Y., Sato, K., Uchida, T., Relationship between rubbing strength and surface anchoring of nematic liquid crystal, Jpn. J. Appl. Phys., 1992, 31: L579-L581.

    Article  Google Scholar 

  17. Xuan Li, Huang Ximin, Orientation order of liquid crystal molecules in the surface layer studied by ellipsometry, Journal of Liquid Crystals and Displays (in Chinese), 1999, 14(3): 153–161.

    Google Scholar 

  18. Xuan Li, Huang Ximin, Orientation order of the molecules in interface layer analyzed by polarized microscope, Journal of Liquid Crystals and Displays (in Chinese), 2000, 15(1): 6–16.

    Google Scholar 

  19. Yokoyama, H., Kobayashi, S., Kamei, H. Temperature dependence of the anchoring strength at a nematic liquid crystal-evaporated SiO interface, J. Appl. Phys., 1987, 61(9): 4501.

    Article  Google Scholar 

  20. Yokoyama, H., Nematic isotropic transition in bounded thin-films, Journal of The Chemical Society-Faraday Transactions II, 1988, 84: 1023–1040.

    Article  Google Scholar 

  21. Gennes, P. G. De, Prost, J., The Physics of Liquid Crystals, 2nd, ed. Oxford: Oxford University Press, 81.

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Correspondence to Ruan Shengping.

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Xuan, L., Wu, R., Peng, Z. et al. Order parameters of liquid crystal on the rubbing surfaces of alignment layers. Sci. China Ser. E-Technol. Sci. 45, 654–660 (2002). https://doi.org/10.1360/02ye9074

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  • DOI: https://doi.org/10.1360/02ye9074

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