A method for making hollow spheres of alumina or aluminate comprises: coating polymeric beads with an aqueous solution of an alumoxane, drying the beads so as to form an alumoxane coating on the beads; heating the beads to a first temperature that is sufficient to convert the alumoxane coating to an amorphous alumina or aluminate coating and is not sufficient to decompose the polymeric beads; dissolving the polymeric bead in a solvent; removing the dissolved polymer from the amorphous alumina or aluminate coating; and heating the amorphous alumina or aluminate coating to a second temperature that is sufficient to form a hollow ceramic sphere of desired porosity and strength. The hollow spheres can be used as proppants or can be incorporated in porous membranes.
申请公布号
WO2005021147(A3)
申请公布日期
2007.04.05
申请号
WO2004US03615
申请日期
2004.02.06
申请人
WILLIAM MARSH RICE UNIVERSITY;BARRON, ANDREW, R.;DEFRIEND, KIMBERLY, A.