Publication: Effects of solvent on TEOS hydrolysis kinetics and silica particle size under basic conditions
Program
KU-Authors
KU Authors
Co-Authors
Malay, Ozge
Menceloglu, Yusuf Z.
Publication Date
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Type
Embargo Status
Journal Title
Journal ISSN
Volume Title
Alternative Title
Abstract
In-situ liquid-state Si-29 nuclear magnetic resonance was used to investigate the temporal concentration changes during ammonia-catalyzed initial hydrolysis of tetraethyl orthosilicate in different solvents (methanol, ethanol, n-propanol, iso-propanol and n-butanol). Dynamic light scattering was employed to monitor simultaneous changes in the average diameter of silica particles and atomic force microscopy was used to image the particles within this time frame. Solvent effects on initial hydrolysis kinetics, size and polydispersity of silica particles were discussed in terms of polarity and hydrogen-bonding characteristics of the solvents. Initial hydrolysis rate and average particle size increased with molecular weight of the primary alcohols. In comparison, lower hydrolysis rate and larger particle size were obtained in the secondary alcohol. Exceptionally, reactions in methanol exhibited the highest hydrolysis rate and the smallest particle size. Ultimately, our investigation elaborated, and hence confirmed, the influences of chemical structure and nature of the solvent on the formation and growth of the silica particles under applied conditions.
Source
Publisher
Springer
Subject
Materials science, Ceramics
Citation
Has Part
Source
Journal of Sol-Gel Science and Technology
Book Series Title
Edition
DOI
10.1007/s10971-013-3088-4