Advertisement

Theory of Light Scattering by Nematics

  • Orsay Liquid Crystal Group
Conference paper

Abstract

The fluctuations of the molecular alignment in pure nematic systems give rise to a strong scattering of light. A study of the scattering intensity vs. angle allows for a determination of (a) the Frank elastic coefficients. (b) the sum of the two piezoelectric coefficients introduced by Meyer. The frequency distribution of the scattered light can be related to the Leslie friction coefficients.

In impure (slightly conducting) nematics, the piezoelectric charges induced by the fluctuations of interest are screened out when the Debye Huckel radius is smaller than the optical wavelength. Thus, for strongly piezoelectric nematics, the light scattering properties might be sensitive to very small amounts of conducting impurities.

Keywords

Elastic Constant Piezoelectric Effect Piezoelectric Coefficient Orientational Relaxation Carrier Effect 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. (1).
    P. Chatelain, Acta Cryst. 1, 315, (1948).CrossRefGoogle Scholar
  2. (2).
    P. G. de Gennes, Compt. Rend. Acad. Sci. Paris 266, 15 (1968). See also: Proceedings of the 2nd Kent Conf. on Liquid Cryst. (to be published).Google Scholar
  3. (3).
    F. C. Frank, Disc. Faraday Soc., 25, 1, (1958).CrossRefGoogle Scholar
  4. (4).
    R. B. Meyer, Phys. Rev. Lett. 22, 918, (1969).CrossRefGoogle Scholar
  5. (5).
    J. L. Erickson, Arch. Rat. Mech., 9, 371, (1962).Google Scholar
  6. F. M. Leslie, Quart. Journ. Mech. and Appl. Math. 19, 357, (1966).CrossRefGoogle Scholar
  7. (6).
    Orsay Liquid Crystal Group: to be published in Journ. Chem. Phys.Google Scholar
  8. (7).
    Orsay Liquid Crystal Group: this symposium, p. 447.Google Scholar
  9. (8).
    O. Parodi, to be published.Google Scholar

Copyright information

© Plenum Press, New York 1970

Authors and Affiliations

  • Orsay Liquid Crystal Group
    • 1
  1. 1.Service de Physique des SolidesFaculté des SciencesOrsayFrance

Personalised recommendations