An Analysis of a New Approach to Sol-gel Synthesis: The Reaction of Formic Acid with Teos

FTIR spectroscopy was investigated as a means of monitoring the reactions of formic acid and tetraethoxy silane, TEOS, at different temperatures and molar ratios of formic acid to TEOS, r. FTIR spectra of the reactions at r values of 1, 2, and 6 showed that increasing the molar ratio and temperature significantly increased the rates of hydrolysis and condensation. An activation energy of 10.5 0.6 kcal/mole was determined for the r= 6 system. 29Si NMR was used to monitor the reaction of formic acid with TEOS at molar ratios of 1, 2, and 6. The increase in reaction rate with increasing molar ratio was clearly evident in the silica NMR spectra…

Author: Brown, Kimberly

Source: University of Maryland

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