Journal
JOURNAL OF NON-CRYSTALLINE SOLIDS
Volume 356, Issue 18-19, Pages 898-905Publisher
ELSEVIER
DOI: 10.1016/j.jnoncrysol.2009.12.029
Keywords
Mesoporous; Hollow silica spheres; Emulsion; Template
Funding
- State Key Development Program for Basic Research of China [2009CB930604]
- Natural Science Foundation of Guangdong Province, China [8151064101000111]
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We report a single-step, emulsion-templating method using triblock copolymer poly(ethylene glycol)-poly( propylene glycol)-poly(ethylene glycol) (PEG-PPG-PEG) as template, sodium silicate or tetraethylorthosilicate (TEOS) as precursor and n-octane and benzyl alcohol as cosolvents. Scanning electron microscopy (SEM) and transmission electron microscopy (TEM) results revealed that ordered mesoporous silica hollow microspheres with thickness of shell about 50 rim and mean diameter 1 pm were prepared by changing the concentration of the reactant, pH and reaction time. Brunauer-Emmett-Teller (BET) analysis confirmed that silica hollow microspheres were porous. Generally, the hierarchical structures of mesoporous silica can be regulated from hollow spheres to solid particles by changing the concentration of benzyl alcohol. This methodology provides a versatile and effective route for preparation of mesoporous hollow materials. (C) 2010 Elsevier B.V. All rights reserved.
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