Water → Aluminum sec-butoxide

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Comparative Example 1 involves the preparation of aluminum phosphate without using an organosilane. A homogeneous solution of aluminum s-butoxide (0.082 gm, 0.33 mmol) in methoxyethanol (0.5 ml) is prepared in a glass vial containing a magnetic stir bar. It is stirred for ½ hr after addition of ethylphosphate (0.06 gm, 0.33 mmol). Addition of DI water (0.010 gm, 0.56 mmol) results in the formation of a milky gel. After diluting with 0.5 ml methoxyethanol, the resulting milky solution is stirred at room temperature/overnight. Addition of DI water (0.010 gm, 0.56 mmol) followed by stirring at RT/overnight and 100° C./2 hrs generates white precipitates. The solution is applied to a glass plate to form a highly opaque non-uniform coating. White solid residues obtained after removing the volatiles are not soluble in methoxyethanol even heated to 120° C. in the presence of phenyltrimethoxysilane.

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