Xerogels precursors

Ol-P-14 - Synthesis of titanium, niobium, and tantalum silicalite-1 by microwave heating of the mixed oxide xerogel precursors... 

F. J. Anaissi, G. J.-F. Demets, E. B. Alvarez, M. J. Politi, and H. E. Toma, Long-term aging of vanadium (V) oxide xerogel precursor solutions structural and electrochemical implications, Electrochim. Acta, 47, 441 50 (2001). 

A pure perovskite phase with the composition SrBi2Ta209 and a crystal size <50 nm was formed at 1073 K from a xerogel precursor, obtained by gelation from Ta(EtO)5 and Sr-acetate and BiO-nitrate solution in methoxyethanol using an acetic acid catalyst [70]. Acetate ions act as bidentate ligands in this solution, equalizing the hydrolysis/condensation rates of Ta and other ions. 

The hybrid xerogels exhibiting remarkable adsorption capacities of water vapor can be prepared in a cost-effective way using the modified one-step, sol-gel procedure with ethyl silicate 40 as silica precursor. 

TABLE 9.1 Structures of Alkylalkoxysilane and Aminoalkoxysilane Precursors Used in the Synthesis of NO-Releasing Xerogels... 

A sol-gel technique was used to prepare hybrid organic-inorganic xerogels containing high concentrations of dithienylethenes. The sol-gel materials were prepared by a method based on co-condensation between the hydrolyzed species of the diarylethene derivative 38a and of methyltrihydroxysilane precursors as shown below. 

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