Abstract
Electro-rheological properties of liquid crystals have been investigated utilizing a parallel-plate type rheometer and a two-dimensional minute channel. A liquid crystal with high specific resistance (LC only) and that with a conductive dopant (LC+TBAB) were tested in order to clarify the influence of electric instability on the ER effect. Flow curves including shear-thinning region were empirically modeled with Carreau type equation from parallel plate test, and the ER effects in the minute channel were numerically predicted with the model. In the case of LC only, the prediction of the model was in good agreement with the experimental. Lower ER effect was obtained with LC+TBAB under DC electric field, where the electroconvection was generated, and the model was partially useful for the prediction. In this case, the influence of the electric field strength on the characteristic time of the model was more complicated than that of the LC only. The transient response of the ER effect at the onset of the electric field was also measured, and almost same response was obtained for all conditions in our test.
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