prov:value
| - Such cross-linking agents are well known in the art and are generally commercially available from a variety of sources, and include, but are not limited to, tetraalkylorthosilicates such as tetraethylorthosilicate, titanium alkoxides, zirconium alkoxides, aluminum alkoxides, tin alkoxides, lanthanide alkoxides, boron alkoxides, germanium alkoxides, and mixtures thereof.
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