Title
Influence of ammonia concentration on the formation of hollow silica microspheres via polystyrene beads templating Influence of ammonia concentration on the formation of hollow silica microspheres via polystyrene beads templating
Author
Faculty/Department
Faculty of Sciences. Chemistry
Publication type
article
Publication
Subject
Physics
Engineering sciences. Technology
Source (journal)
International journal of materials research
Volume/pages
102(2011) :12 , p. 1488-1492
ISSN
1862-5282
ISI
000298777100010
Carrier
E
Target language
English (eng)
Full text (Publishers DOI)
Affiliation
University of Antwerp
Abstract
The influence of ammonia concentration on the formation of hollow silica microspheres via polystyrene beads templating was investigated. Hollow silica microspheres could only be templated in water ethanol ammonia tetraethyl orthosilicate media with low concentrations of ammonia. It is shown that in template-free media, the aggregation of silica particles decreases with ammonia concentrations. Thus, the aggregation degree of formed silica particles may imply whether a silica forming media is suitable for preparing hollow silica microspheres via polystyrene beads templating. The increase in ammonia promotes spontaneous nucleation and condensation of silica oligomers to form silica particles. The repulsive forces between the particles as well as those between them and templates are relatively large, hindering the assembly of silica primary particles on the templates to form silica shells.
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