Expanding mesoporosity of triblock-copolymer-templated silica under weak synthesis acidity

Li, J.J., Hu, Q., Tian, H., Ma, C.Y., Li, L.D., Cheng, J., Hao, Z.P. and Qiao, S.Z. (2009) Expanding mesoporosity of triblock-copolymer-templated silica under weak synthesis acidity. Journal of Colloid and Interface Science, 339 1: 160-167. doi:10.1016/j.jcis.2009.07.041

Author Li, J.J.
Hu, Q.
Tian, H.
Ma, C.Y.
Li, L.D.
Cheng, J.
Hao, Z.P.
Qiao, S.Z.
Title Expanding mesoporosity of triblock-copolymer-templated silica under weak synthesis acidity
Journal name Journal of Colloid and Interface Science   Check publisher's open access policy
ISSN 0021-9797
Publication date 2009-11
Year available 2009
Sub-type Article (original research)
DOI 10.1016/j.jcis.2009.07.041
Volume 339
Issue 1
Start page 160
End page 167
Total pages 8
Editor Darsh T. Wasan
Place of publication USA
Publisher Academic Press (Elsevier Science)
Collection year 2010
Language eng
Subject C1
Abstract With initial aging at low temperature for enough time, silicas with large mesoporosity were synthesized using triblock copolymer as template agent under weak acidities. SBA-15 with periodic mesostructure and short mesochannels could be synthesized at pH 2.5-3.0 within weak acidity range, and the surface areas, pore diameters and pore volumes reached up to ca. 1000 m(2)/g, 8.8 nm and 2.0 cm(3)/g, respectively, which were significantly higher than those of the conventional SBA-15 synthesized under strong acidities. Mesoporous silica with wormhole structure and abundant textural porosity was formed at pH similar to 3.5. The increased hydrophobic volume of the copolymer micelles at elevated pH values was responsible for the enlargement of mesoporosity in the products. The materials synthesized under weak acidities showed lower hexagonal ordering in comparison to the general SBA-15 synthesized under strong acidities because the decreased hydronium ion concentration induced relatively weaker assembly forces during the synthesis. Nonetheless, the short mesochannels and large pore diameter in the products might be beneficial to some applications in which fast diffusion of molecules is required. (C) 2009 Elsevier Inc. All rights reserved.
Keyword SBA-15
Weak acidity
Large pore volume
Short mesochannel
Mesoporous silica
Wormhole structure
Textural porosity
Q-Index Code C1
Q-Index Status Confirmed Code

Document type: Journal Article
Sub-type: Article (original research)
Collections: 2010 Higher Education Research Data Collection
Australian Institute for Bioengineering and Nanotechnology Publications
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Created: Sun, 13 Dec 2009, 00:04:17 EST