Dynamic viscosity of dispersion of silica dioxide nanoparticles

Abstract

Dynamic viscosity of silica dioxide suspensions in oils was investigated by acoustical, rotary and capillary methods. An installation has also been created for measuring the viscosity of a liquid at low gradients of the flow velocity, when one can expect that the structure of the liquid change little during elementary acts of viscous flow. It is shown that at low flow rate gradients of the investigated suspensions, an increased value of viscosity is found (relative to the viscometric one), which indicates the structuring of these suspensions with the formation of a supramolecular structure. The observed phenomenon of increased viscosity can be of practical importance for all processes where slow flows prevail.