POROUS CERIA AGGREGATES OF SUBMICRON SIZE WERE OBTAINED FROM CERIUM(IV) ISOPROPOXIDE VIA A TWO-STEP SOL–GEL PROCESS. IN THE FIRST STEP, DISPERSION OF THE CERIUM(IV) ISOPROPOXIDE IN ISOPROPANOL MEDIA WAS ACHIEVED BY ULTRASONIC RADIATION, WHERE LIMITED HYDROLYSIS OCCURRED AND RESULTED IN THE FORMATION OF A STABLE DISPERSANT GEL PHASE. IN THE SECOND STEP, THE RESULTANT DISPERSIONS WERE MIXED UNDER STIRRING WITH ... إقراء المزيد