ネマチック-コレステリック混合液晶における誘電緩和

概要

論文の詳細を見る
The influence of different contents of cholesteryl nonanoate ( CN ) on dielectric constants of liquid nematic crystal MBBA( p-methoxybenzylidene-p-n-butylaniline) is reported. Although the dielectric constant must be measured by using high conductive electrodes such as gold or platinum, transparent electrodes (I_<n2>O_3) are used in this experiment for the purpose of researching the correlation between the dielectric constant and the pattern of liquid crystals in sandwich cells. Both parallel conductance and capacitance, C_p and G_p are measured with a Q meter The real and imaginary parts of the dielectric constants, ε'_s , ε"_s , are calculated by using values C_p and G_p. Plotling ε'_s versus ε"_s for various frequencies, Cole-Cole arcs are obtained. In the case of the thin cell (the thickness of the liquid crystal is about 50μ), some characteristics can be explained qualitatively by Cole-Cole's circular arc law. Furthermore, the effects of the thickness and the cholesteric content of the sample on the relaxation time are discussed.
近畿大学の論文
1975-12-01