Abstract
Silicon-29 nuclear magnetic resonance (NMR) spectroscopy is used to characterize aqueous and non-aqueous alkaline solutions of tetraphenylammonium (TPA) silicates. Effect of the TPA cation on the equilibrium of silicate oligomers in aqueous and non-aqueous alkaline silicate solutions is investigated using 29Si NMR spectra. It was found that the TPA cation had a structural directing role, directing the silicate species to form minor amounts of high order silicate anion in the presence of a high concentration of silicon. 29Si NMR spectra of TPA silicate solutions indicate that considerable changes occur by changing the Si/TPA ratio. Also the effect of different alcohols on the distribution of silicate species is investigated. The results obtained show that distribution of these species is affected by the presence of alcohols and that maximum variations in this distribution are observed in the presence of methanol.
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Goudarzi, N. Silicon-29 NMR Spectroscopy Study of the Effect of Tetraphenylammonium (TPA) as a Template on Distribution of Silicate Species on Alkaline Aqueous and Alcoholic Silicate Solutions. Appl Magn Reson 44, 469–478 (2013). https://doi.org/10.1007/s00723-012-0394-x
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DOI: https://doi.org/10.1007/s00723-012-0394-x