Journal
MATERIALS LETTERS
Volume 65, Issue 7, Pages 1066-1068Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.matlet.2011.01.035
Keywords
Mesoporous silica; SBA-16; Hollow spheres; Large pore; F127
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Hollow silica SBA-16 spheres with cubic ordered mesoporous shells were synthesized by an emulsion-templating method, using Pluronic F127 as a structure-directing agent. tetraethyl orthosilicateas as a silica source and heptane as a cosolvent in the presence of NH(4)F. The size of these spheres is in the range of 10 to 30 mu m. The shell is about 700 nm thick and consists of large pores, similar to 9 nm in diameter, arranged in a cubic order. After calcination, the spheres maintain their mesoporosity and show a high surface area of 822 m(2)/g. The formation mechanism of the silica hollow spheres is discussed. (C) 2011 Elsevier B.V. All rights reserved.
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