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