Unraveling the growth mechanism of silica particles in the stöber method: In situ seeded growth model

Han, Y, Lu, Z, Teng, Z, Liang, J, Guo, Z, Wang, D, Han, M and Yang, W 2017, 'Unraveling the growth mechanism of silica particles in the stöber method: In situ seeded growth model', Langmuir, vol. 33, no. 23, pp. 5879-5890.


Document type: Journal Article
Collection: Journal Articles

Title Unraveling the growth mechanism of silica particles in the stöber method: In situ seeded growth model
Author(s) Han, Y
Lu, Z
Teng, Z
Liang, J
Guo, Z
Wang, D
Han, M
Yang, W
Year 2017
Journal name Langmuir
Volume number 33
Issue number 23
Start page 5879
End page 5890
Total pages 12
Publisher American Chemical Society
Abstract In this work, we investigated the kinetic balance between ammonia-catalyzed hydrolysis of tetraethyl orthosilicate (TEOS) and subsequent condensation over the growth of silica particles in the Stöber method. Our results reveal that, at the initial stage, the reaction is dictated by TEOS hydrolysis to form silanol monomers, which is denoted as pathway I and is responsible for nucleation and growth of small silica particles via condensation of neighboring silanol monomers and siloxane network clusters derived thereafter. Afterward, the reaction is dictated by condensation of newly formed silanol monomers onto the earlier formed silica particles, which is denoted as pathway II and is responsible for the enlargement in size of silica particles. When TEOS hydrolysis is significantly promoted, either at high ammonia concentration (?0.95 M) or at low ammonia concentration in the presence of LiOH as secondary catalyst, temporal separation of pathways I and II makes the Stöber method reminiscent of in situ seeded growth. This knowledge advance enables us not only to reconcile the most prevailing aggregation-only and monomer-addition models in literature into one consistent framework to interpret the Stöber process but also to grow monodisperse silica particles with sizes in the range 15-230 nm simply but precisely regulated by the ammonia concentration with the aid of LiOH. © 2017 American Chemical Society.
Subject Colloid and Surface Chemistry
DOI - identifier 10.1021/acs.langmuir.7b01140
Copyright notice © 2017 American Chemical Society
ISSN 0743-7463
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