Abstract
A preparation method is reported for the microencapsulation of SiO 2 by rapid expansion of supercritical solution with a nonsolvent. A suspension of SiO 2 in carbon dioxide containing a cosolvent and dissolved polymer is sprayed through a nozzle to atmospheric pressure. After rapid expansion, polymer microspheres were obtained. The microspheres do not tend to agglomerate, since the pure cosolvent is a nonsolvent for the polymer. The structure and morphology of microspheres were investigated by SEM and TEM. The obtained polymer microspheres are microcapsules of SiO 2 particles. The primary particle diameter and particle size distribution of microcapsules, could be controlled by changing the feed composition, pre-expansion pressure, temperature, and diameter of nozzle. The polymer feed composition is more effective than other factors on the control of particle size.
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