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利用动态激光散射技术,实现无扰在位情况下,对向列液晶的弹性常数和黏滞系数的同时测定。实验中首先通过分析测定不同散射角下向列液晶的光散射自相关函数,获得向列液晶展曲和扭曲两种模式的振幅A_1,A_2及所对应的弛豫系数,从而得出向列液晶的展曲和扭曲弹性常数;再根据两种模式弛豫系数得出的弹黏比K_(11)/η_(展曲)和K_(22)/η_(扭曲),确定向列液晶的黏滞系数值η_(展曲)和η_(扭曲)。
Simultaneous Determination of Elastic Constants and Viscosity Coefficients of Nematic Liquid Crystals Using Dynamic Laser Scattering Technique. In the experiment, firstly, the light scattering autocorrelation function of nematic liquid crystal at different scattering angles was analyzed and the amplitudes A_1 and A_2 of the two modes of nematic liquid crystal and the corresponding relaxation coefficients were obtained. Flexing and twisting elastic constants of the nematic liquid crystal were calculated based on the elastic modulus K11 / η_ (kurtosis) and K22 / η_ (twist) obtained from the relaxation coefficients of the two modes Values η_ (spread) and η_ (twist).