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.
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