| Abstrakt: |
Orientational order parameter, S and effective geometry, αgare calculated from the refractive index in three nematic room temperature liquid crystal mixtures, blOO3, blOO6, and blO38. The method due to Kuczynski et al. used to determine S from birefringence. The effective geometry parameter is αg= no/ne. (noand neare the ordinary and extraordinary refractive indices of the liquid crystal material.) The behavior of αgas a function of temperature and order parameter has also been reported. The S value calculated from αgis identically equal to the value obtained from Kuczynski et al method, i.e., from birefringence, δn. Finally, dne/dT and dno/dT are obtained and the crossover temperatures, TCOthe characteristic temperature, which is in fact the temperature of minimum in the ordinary index of refraction in three mixtures for different wavelengths are calculated from dno/dT. [ABSTRACT FROM AUTHOR] |
