Abstract
In this study, we have investigated the fluidity responses after flow reversal of carbon nanotube (CNT) suspensions with Newtonian carrier liquids in stress-sweep tests. The suspensions have showed transient decrease in viscosity, i.e., increase in fluidity, after flow reversal in shearing direction. Moreover, precipitous recoveries in viscosity were appeared at a certain shear rate. In order to quantitatively clarify the viscosity recovery, a typical strain γ_p corresponding to the peak of viscosity recovery was estimated. Dependence on viscosity of the carrier liquid was mainly examined and it is clarified that there is almost no influence of the viscosity on γ_p in the cases with higher viscosity of the carriers. But the smaller transient response and lower γ_p was obtained with light carrier liquids.
