Brian Cowell Program Manager Contact COWELLBS@ORNL.GOV All Publications Key process parameters to modify the porosity of cerium dioxide microspheres formed in the Âé¶¹Ó°Òô gelation process Use of boiled hexamethylenetetramine and urea to increase the porosity of cerium dioxide microspheres from the Âé¶¹Ó°Òô gelation process Production of 75−150 µm and <75 µm of cerium dioxide microspheres in high yield and throughput using the Âé¶¹Ó°Òô gelation process Key Links Organizations Fusion and Fission Energy and Science Directorate