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利用石英晶体微天平(quartz crystal microbalance,QCM)研究了电场对5CB液晶分子的近壁面层黏弹性的影响.对QCM结果的分析发现,电场作用对液晶的黏度影响分为两部分,通过建立含吸附膜的双层膜模型,分析了QCM的两部分结果,发现电场对近壁面吸附层及体相层的影响是不同的.根据QCM的双层膜模型,对近壁面层液晶分子的黏弹性及膜厚进行了定量的分析计算,结果表明5CB在石英晶体上电极附近有一层约100nm厚的近壁面吸附层,其复剪切黏度随电场强度的增加而减小,这与5CB液晶的体相黏度变化规律相反.
The influence of the electric field on the viscoelasticity of the near-wall layer of 5CB liquid crystal molecules was investigated by quartz crystal microbalance (QCM). The analysis of the QCM results shows that the influence of the electric field on the viscosity of the liquid crystal is divided into two parts. The results show that the electric field has different effects on the adsorption layer and the bulk layer near the wall.According to the QCM bilayer membrane model, the viscoelasticity of the liquid crystal molecules near the surface layer And film thickness were quantitatively analyzed and calculated. The results show that 5CB near the upper quartz crystal has a layer of about 100nm thick near-wall adsorption layer, the complex shear viscosity decreases with increasing electric field strength, which is 5CB liquid crystal body Phase viscosity changes in the opposite.