Advertisement

Infrared Spectroscopic Measurements on the Crystal-Nematic Transition

  • Bernard J. Bulkin
  • Dolores Grunbaum
Conference paper

Abstract

Although many studies have been carried out to measure the extent of order as a function of temperature in the liquid crystalline state of thermotropic liquid crystals, little work has been done to indicate the amount of order or disorder in solids as the liquid crystalline state is approached. Such studies as have been reported (1), mainly deductions based on the shape of thermal analysis curves in the pre transition region, indicate that the crystal-nematic transition maybe of greater than first order or that there maybe some pre-transition phenomena. The shapes of DTA and DSC curves are, however, very dependent on instrumental response, etc., often in ways which have yet to be fully explored.

Keywords

Liquid Crystal Erature Region Thermal Analysis Curve Liquid Crystalline State Entire Layer 
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)a.
    H. Arnold, in Liquid Crystals, G. H. Brawn, G. J. Dienes and M. M. Labes, eds., Gordon and Breach, New York, 1967, pp. 323–330 and refs. ThereinGoogle Scholar
  2. b.
    A. V. Santoro and G. Spielholtz, Anal. Chin. Acta, 42, 537 (1968).CrossRefGoogle Scholar
  3. 2).
    W. Maier and G. Englert, Z. Elecktrochem., 62, 1020 (1958).Google Scholar
  4. 3).
    J. D. Bernal and D. Crowfoot, Trans. Far. Soc., 22, 1032 (1933).CrossRefGoogle Scholar
  5. 4).
    J. E. Mayer and S. F. Streeter, J. Chem. Phys., 7, 1019 (1939).CrossRefGoogle Scholar
  6. 5).
    G. Durand and D.V.G.L. Narasimba Rao, Bull. Am. Phys, Soc., 17, 1054 (1967).Google Scholar
  7. 6).
    W. A. Nordland, J. Appl. Phys. 39, 5033 (1968).Google Scholar
  8. 7).
    W. L. Bragg and E. J. Williams, Froc. Roy Soc., A145, 699 (1934).CrossRefGoogle Scholar
  9. 8).
    G. Gray, in ref. 1, pg. 142.Google Scholar
  10. 9).
    M. M. Labes and C. Kobayashi, paper presented at the Second International Symposium on Liquid Crystals, Kent, Ohio, August 1968.Google Scholar

Copyright information

© Plenum Press, New York 1970

Authors and Affiliations

  • Bernard J. Bulkin
    • 1
  • Dolores Grunbaum
    • 1
  1. 1.Hunter College of the City University of New YorkNew YorkUSA

Personalised recommendations