Preparation of Hollow Silica Nanospheres by Surface-Initiated Atom Transfer Radical Polymerization on Polymer Latex Templates

Poly(vinylbenzyl chloride), (PVBC) latex particles of about 100 nm in size are prepared by emulsion polymerization. Silyl functional groups are introduced onto the PVBC‐nanoparticle templates via surface‐initiated atom transfer radical polymerization of 3‐(trimethoxysilyl)propyl methacrylate. The si...

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Bibliographic Details
Published in:Advanced functional materials 2005-01, Vol.15 (1), p.113-117
Main Authors: Chen, Y., Kang, E. T., Neoh, K. G., Greiner, A.
Format: Article
Language:English
Subjects:
Hollow materials
inorganic
Nanoparticles
Nanoparticles, inorganic
Nanospheres
Nanospheres, silica
Silica
Template-directed synthesis/assembly
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Summary:Poly(vinylbenzyl chloride), (PVBC) latex particles of about 100 nm in size are prepared by emulsion polymerization. Silyl functional groups are introduced onto the PVBC‐nanoparticle templates via surface‐initiated atom transfer radical polymerization of 3‐(trimethoxysilyl)propyl methacrylate. The silyl groups are then converted into a silica shell, approximately 20 nm thick, via a reaction with tetraethoxysilane in ethanolic ammonia. Hollow silica nanospheres are finally generated by thermal decomposition of the PVBC template cores. Field‐emission scanning electron microscopy and field‐emission transmission electron microscopy are used to characterize the intermediate products and the hollow nanospheres. Fourier‐transform infrared spectroscopy results indicate that the polymer cores are completely decomposed. Hollow silica nanospheres are synthesized by surface‐initiated atom transfer radical polymerization (ATRP) of 3‐(trimethoxysilyl)propyl methacrylate (TMSPM) from templating poly(vinylbenzyl chloride) (PVBC) latex nanoparticles, followed by polycondensation of tetraethoxysilane (TEOS) in ethanolic ammonia and removal of the PVBC cores by thermal decomposition (see Figure).
ISSN:1616-301X
1616-3028
DOI:10.1002/adfm.200400179