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A new study on the kinetics of Stöber synthesis by in-situ liquid 29Si NMR

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Abstract

Liquid-state 29Si NMR was used to investigate the hydrolysis and condensation kinetics of ammonia-catalyzed tetraethoxysilane (TEOS) in methanol system. The reactive rate constants were calculated by applying first-order reaction approximation and the steady state approximation theory. The reaction orders with respect to TEOS, ammonia and water were derived, as well as the activation energies and the Arrhenius constants. It was found that the formation of intermediate species Si(OH)(OEt)3 was the rate-limiting step and its reaction rate equation was r TEOS=7.41×10−3[TEOS][NH3]0.333[H2O]0.227. Higher reactive temperature benefited the hydrolysis of TEOS. The results presented here indicated quantificationally that the formation of colloidal SiO2 particles was controlled by the initial hydrolysis of TEOS.

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Acknowledgments

The financial support from the National Key Native Science Foundation (No. 20133040) was gratefully acknowledged.

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Authors and Affiliations

  1. State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan, 030001, China

    Yao Xu, Dong Wu & Yuhan Sun

  2. State Key Laboratory of Magnetic Resonance & Atomic & Molecular Physics, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan, 430071, China

    Hongchang Gao, Hanzhen Yuan & Feng Deng

Authors
  1. Yao Xu
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  2. Dong Wu
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  3. Yuhan Sun
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  4. Hongchang Gao
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  5. Hanzhen Yuan
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  6. Feng Deng
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Correspondence to Yao Xu.

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Xu, Y., Wu, D., Sun, Y. et al. A new study on the kinetics of Stöber synthesis by in-situ liquid 29Si NMR. J Sol-Gel Sci Technol 42, 13–20 (2007). https://doi.org/10.1007/s10971-006-1518-2

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  • DOI: https://doi.org/10.1007/s10971-006-1518-2

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