2) By the removal of surface-adhered nanoparticles after ultrasonic cleaning, the AS value of porous silica did not exhibit a substantial change; on the other hand, nonporous silica did exhibit an increase in the AS value.
2) By the removal of surface-adhered nanoparticles afterultrasonic cleaning, the AS value of porous silica did notexhibit a substantial change; on the other hand, nonporoussilica did exhibit an increase in the AS value.