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  • Study on the ammonia-catalyzed hydrolysis kinetics of single phenyltriethoxysilane and mixed phenyltriethoxysilane/tetraethoxysilane systems by liquid-state 29Si NMR

    Author(s)
    Sun, Xianyong
    Xu, Yao
    Jiang, Dong
    Yang, Dongjiang
    Wu, Dong
    Sun, Yuhan
    Yang, Yongxia
    Yuan, Hanzhen
    Deng, Feng
    Griffith University Author(s)
    Yang, Dongjiang
    Year published
    2006
    Metadata
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    Abstract
    In situ 29Si liquid-state nuclear magnetic resonance was used to investigate the ammonia-catalyzed hydrolysis and condensation of the single phenyltriethoxysilane (PTES) systems and the mixed tetraethoxysilane (TEOS)/PTES systems dissolved in methanol. By varying the molar ratio of the PTES, water and ammonia in the initial solutions, the hydrolysis rate constants for PTES in single precursor systems were disclosed as well as the corresponding reaction orders by fitting the concentration curves of the intermediate species as functions of time. Due to the cooperation of inductive and steric effect, PTES shows a low reaction ...
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    In situ 29Si liquid-state nuclear magnetic resonance was used to investigate the ammonia-catalyzed hydrolysis and condensation of the single phenyltriethoxysilane (PTES) systems and the mixed tetraethoxysilane (TEOS)/PTES systems dissolved in methanol. By varying the molar ratio of the PTES, water and ammonia in the initial solutions, the hydrolysis rate constants for PTES in single precursor systems were disclosed as well as the corresponding reaction orders by fitting the concentration curves of the intermediate species as functions of time. Due to the cooperation of inductive and steric effect, PTES shows a low reaction activity. Under ammonia catalysis, the hydrolysis reaction orders of TEOS and PTES in the mixed precursor systems all retained the first-order, which is similar to single precursor systems. The hydrolysis rate constants of TEOS and PTES in the mixed systems were larger than the values of TEOS and PTES in their single precursor systems, respectively. Another important result was: the reaction orders of both ammonia and water increased to different extent for TEOS and PTES in mixed systems. Hydrolysis and condensation kinetics showed more compatible hydrolysis-condensation relative rates between TEOS and PTES, which affected remarkably the final microstructure of silica particles.
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    Journal Title
    Colloids and Surfaces A: Physicochemical and Engineering Aspects
    Volume
    289
    Issue
    1-3
    DOI
    https://doi.org/10.1016/j.colsurfa.2006.04.024
    Subject
    Physical Chemistry not elsewhere classified
    Physical Sciences
    Chemical Sciences
    Engineering
    Publication URI
    http://hdl.handle.net/10072/58150
    Collection
    • Journal articles

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