The desaggregation of solid particle aggregates by ultrasonication

The influence of some variables (concentration, intensity, and time) of ultrasonication on the mean particle size is determined by ultracentrifugation and capillary viscosimetry. For the fused silica Aerosil 200^® under optimal conditions only an aggregate radius of 23 nm is achieved. That means an irreversible fused aggregate of about 21 primary particles which contains 60% v/v of immobilized water.