Relaxation Study of the Electric Field Induced Hydrodynamic Turbulence in Nematic Liquid Crystals by Raman Scattering.
Abstract
Using Raman scattering, the authors have measured the relaxation time of the electric field induced hydrodynamic turbulence in the bulk of several nematic liquid crystal samples as a function of temperature. The induced hydrodynamic turbulence is absent in the solid as well as in the isotropic liquid phase, and thus is a specific property of the anisotropic character of the bulk nematic material. The temperature dependent behavior of the liquid crystals with positive dielectric anisotropy (azo compounds) is found to be rather different from that with negative dielectric anisotropy (azoxy compounds). In both the azo and the azoxy compounds the relaxation time can all be fit to the Arrhenius type of activation process. It is suggested that the dipole-dipole interaction in the compounds of negative dielectric anisotropy is likely to play a very significant role in determining the relaxation behavior of the electrohydrodynamic instability in the bulk of nematic liquid crystal samples. (Modified author abstract)
Document Details
- Document Type
- Technical Report
- Publication Date
- Nov 21, 1973
- Accession Number
- AD0770595
Entities
People
- C. H. Wang
- Si Hui Pan
Organizations
- University of Utah