On the effect of an increase in the effective viscosity of nanodispersed Aerosil in Vaseline oil in the range of extra low shear rates

Abstract

Total flow curves of the suspensions of modified (methylated) nanodispersed Aerosil (mean particle size is 40 nm) in Vaseline oil with concentrations of 2–7 wt % are recorded under quasi-equilibrium conditions. The behavior of these structured nanodisperse systems in the range of extra low shear rates (10−6-10−3 s−1) is studied in detail. In this range of shear rates, the effect of an increase in the rise of effective viscosity with increasing shear stress is revealed for concentrated Aerosil suspensions for the first time.