Facile synthesis of hollow silica microspheres

Inorganic hollow microspheres are of potential interest for use as low density, mechanically and thermally stable materials in fields such as biomedicine and engineering. Hollow silica microspheres were synthesised at room temperature from a vortexed mixture of water and droplets of tetraethoxysilan...

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Bibliographic Details
Published inJournal of materials chemistry Vol. 11; no. 8; pp. 1968 - 1971
Main Authors FOWLER, Christabel E, KHUSHALANI, Deepa, MANN, Stephen
Format Journal Article
LanguageEnglish
Published Cambridge Royal Society of Chemistry 2001
Subjects
Chemistry
Colloidal state and disperse state
Exact sciences and technology
General and physical chemistry
General, apparatus, technics of preparation
Encapsulation
Scanning electron microscopy
Nitrogen heterocycle
Porphyrin
Preparation
Micron size particle
Cationic surfactant
Spherical particle
Organic compounds
Macrocycle
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Summary:Inorganic hollow microspheres are of potential interest for use as low density, mechanically and thermally stable materials in fields such as biomedicine and engineering. Hollow silica microspheres were synthesised at room temperature from a vortexed mixture of water and droplets of tetraethoxysilane (TEOS) containing 10 mol% aminopropyltriethoxysilane: droplets stabilised with the surfactant cetyltrimethylammonium bromide produced silica shells, 30.6 micron in mean diameter, whereas replacing the Br- counterion with [Co(B9C2H11)2]- gave an approximately hundred-fold decrease in the size of the hollow spheres. Organo-functionalised hollow microspheres containing a covalently linked dye moiety were prepared by replacing 5 mol% of TEOS with dinitrophenylaminotriethoxysilane in the reaction mixture, and encapsulation of TEOS-soluble additives within the silica shells was demonstrated by incorporating porphyrin molecules and particles into the ethoxysilane droplets. 24 refs.
Bibliography:ObjectType-Article-2
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ISSN:0959-9428
1364-5501
DOI:10.1039/b102675p