Time-dependent viscous flow behavior of a hydrophobic fumed silica suspension

Abstract:

The viscous flow behavior of a 12.5 vol% hydrophobic fumed silica (Aerosil® R816) suspension in polypropylene glycol of low molecular weight (PPG400) was studied in a stress-controlled rheometer. The steady flow curve showed shear thickening between two shear thinning regions. Time-dependent viscosity response provoked by step changes in shear stresses corresponding to the shear-thickening region apparently agrees with thixotropic behavior just after the very initial stages are surpassed. Almost instantaneous jamming can justify misinterpretation of the results.

Año de publicación:

2021

Keywords:

• polypropylene glycol
• Shear-thickening
• Hydrophobic fumed silica
• Time-dependent shear viscosity

Fuente:

scopus