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Synthesis of 3-dimensional mesoporous silica using a di-block copolymer template

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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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Acknowledgements

The authors are grateful to the AIF (Atlantic Innovation Foundation) Canada for financial support. The authors also express their thanks to Dr Michael Lumsden at the Dalhousie University for 29Si MAS NMR analysis, and Dr Louise Weaver at the University of New Brunswick for TEM measurements.

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Authors and Affiliations

  1. Department of Chemical Engineering, University of New Brunswick, Fredericton, NB, Canada, E3B 5A3

    Jinlan Ju & Huining Xiao

  2. Department of Chemical Engineering, University of Ottawa, Ottawa, ON, Canada, K1N 6N5

    Zisheng Zhang

  3. State Key Lab of Pulp & Paper Eng., South China University of Technology, Guangzhou, China

    Huining Xiao

Authors
  1. Jinlan Ju
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  2. Huining Xiao
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  3. Zisheng Zhang
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Correspondence to Huining Xiao.

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Ju, J., Xiao, H. & Zhang, Z. Synthesis of 3-dimensional mesoporous silica using a di-block copolymer template. J Mater Sci 42, 4461–4469 (2007). https://doi.org/10.1007/s10853-006-0412-1

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  • DOI: https://doi.org/10.1007/s10853-006-0412-1

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