Unraveling the Growth Mechanism of Silica Particles in the Stöber Method: In Situ Seeded Growth Model

Langmuir : the ACS Journal of Surfaces and Colloids
Yandong HanWensheng Yang

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 monod...Continue Reading

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Citations

Jul 2, 2019·Dalton Transactions : an International Journal of Inorganic Chemistry·Graham E TilbureyCarole C Perry
May 14, 2020·Biomolecules·Massimiliano MagroFabio Vianello
Aug 23, 2020·Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry·Cristina ChircovȘtefan Claudiu Turculeƫ
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Dec 8, 2020·Microscopy and Microanalysis : the Official Journal of Microscopy Society of America, Microbeam Analysis Society, Microscopical Society of Canada·Sana AzimR J Dwayne Miller
Mar 7, 2021·Polymers·Dafna Heiman-BursteinSamuel Kenig
Mar 17, 2021·ACS Applied Materials & Interfaces·Weiping LiuSurita R Bhatia
May 1, 2019·ACS Applied Materials & Interfaces·Marie-Alix Pizzoccaro-ZilamyMieke W J Luiten-Olieman
Apr 12, 2019·Journal of Colloid and Interface Science·Breno R BarrioniMarivalda de M Pereira
Dec 30, 2017·Langmuir : the ACS Journal of Surfaces and Colloids·Shigeru SakamotoKazuyuki Kuroda
Sep 4, 2021·Materials Science & Engineering. C, Materials for Biological Applications·Neda Aslankoohi, Kibret Mequanint
Sep 28, 2021·Langmuir : the ACS Journal of Surfaces and Colloids·Denise NeibloomJoelle Frechette
Oct 9, 2021·Nanoscale·Bárbara CasteleiroJosé Paulo Sequeira Farinha
Nov 1, 2020·Journal of Colloid and Interface Science·Pramila P Ghimire, Mietek Jaroniec

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