Ultrasonic Propagation in the Liquid Crystal Phases of g-Alkoxybenzoic Acids

周勝次(L. S. Chou)

Chinese Journal of Physics

18卷3期（1980 / 10 / 01）

114 - 118

英文

Ultrasonic absorption has been measured in p-alkoxybenzoic acids in the isotropic, nematic and smectic phases in the frequency range 9-85 MHz. The frequency and temperature dependence of the absorption indicates the presence of relaxation processes, which are attributed to rearrangements of the equilibrium distributions of open dimers and cyclic dimers. The relaxation frequency is about 15 MHz in the nematic phase.