| http://www.w3.org/ns/prov#value | - Preferred metal oxides include titanium oxides such as rutile, titanium monoxide, titanium sesquioxide; silicon oxides, such as silica, surfactant coated silica particles, zeolites, and surface treated derivatives thereof such as for example fluorinated silicas as described in U.S. Pat. No. 6,071,614; aluminum oxides such as aluminas, for example boehmite, pseudo-boehmite, bayerite, mixed oxides s
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