| http://www.w3.org/ns/prov#value | - s selected from the group consisting of silica and alumina and is in a form of particles, wherein the amorphous metal oxide has a particle diameter that is less than that of the said at least one compound, the outermost layer prepared by a method comprising the sequential steps of: (a) providing a sol mixture including a first sol containing a precursor of the titania, a second sol containing the
|
