Synthesis of 3-dimensional mesoporous silica using a di-block copolymer template |
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Authors: | Jinlan Ju Huining Xiao Zisheng Zhang |
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Affiliation: | (1) Department of Chemical Engineering, University of New Brunswick, Fredericton, NB, Canada, E3B 5A3;(2) Department of Chemical Engineering, University of Ottawa, Ottawa, ON, Canada, K1N 6N5;(3) State Key Lab of Pulp & Paper Eng., South China University of Technology, Guangzhou, China |
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Abstract: | Exploring polymeric surfactants as templates for synthesizing ordered mesoporous silicas has become increasingly important
for both academic interests and industrial applications. In this work, we employed C16EO40, a di-block copolymer polyethylene-poly(ethylene oxide), as template in an attempt to synthesize a modified 3-dimensional
wormhole mesoporous silicas (WMS-39). In addition, various synthesizing conditions were investigated, including pre-hydrolysis
time of TEOS, reaction temperatures and the ratios of TEOS to template. The products were characterized using powder XRD,
TEM, 29Si MAS NMR and nitrogen adsorption measurements. The characteristics of as-synthesized mesoporous silica were compared with
SBA-15, a highly ordered mesoporous silica, prepared using non-ionic tri-block copolymers of poly(ethylene oxide)–poly(propylene
oxide)–poly(ethylene oxide) as templates. The WMS-39 materials have a BET surface area of 600–970 m2/g and narrowly distributed pore diameter around 3.9 nm. The morphology of WMS-39 was found to be wormhole framework as indicated
in TEM diagrams. Thermal transformation of the as-synthesized mesoporous materials were carefully analyzed with TGA/DTA. Findings
obtained from this work enable us to propose a modified assembly mechanism of mesoporous silicas. |
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