Twist elastic constant of a cholesteric polypeptide liquid crystal
- 1 April 1974
- journal article
- research article
- Published by AIP Publishing in The Journal of Chemical Physics
- Vol. 60 (7), 2759-2761
- https://doi.org/10.1063/1.1681439
Abstract
We have determined the critical magnetic field for the cholesteric to nematic transition of a pure lyotropic liquid crystal solution of an α‐helical polypeptide, poly‐γ‐benzyl‐L‐glutamate, by direct microscopic observation of the changing pitch of the structure as a function of magnetic field strength. The course of the transition is well accounted for by the theory of deGennes. An independent measurement of the anisotropy of diamagneticsusceptibility allows the determination of κ22, the twist elastic constant of the medium.Keywords
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