{HEAD ~ The method} further includes forming {TAIL ~ a second feedstock} by removing at least a portion of the byproduct of the first hydrothermal treatment and subjecting the second feedstock to a second hydrothermal treatment to form a zirconia sol that contains the zirconia particles 
{ HEAD ~ The method } further includes forming { TAIL ~ a second feedstock } by removing at least a portion of the byproduct of the first hydrothermal treatment and subjecting the second feedstock to a second hydrothermal treatment to form a zirconia sol that contains the zirconia particles
HEAD HEAD HEAD HEAD HEAD HEAD OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH