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Journal of Materials Science

, Volume 44, Issue 24, pp 6453–6462 | Cite as

Morphological control on SBA-15 mesoporous silicas via a slow self-assembling rate

  • Man-Chien Chao
  • Chia-Hsien Chang
  • Hong-Ping LinEmail author
  • Chih-Yuan Tang
  • Ching-Yen Lin
Mesostructured Materials

Abstract

Pluronic 123-templated mesoporous SBA-15 silica rods with a length of ca. 3.0–4.0 μm were easily synthesized in a dilute silicate solution with a pH value of 2.0 at room temperature. Through a good control on the synthetic condition and the chemical components, a high homogeneity (>95%) of the hexagonal SBA-15 silica rods can be achieved. In addition, the effect of the synthetic conditions including acid source, weight ratio of the P123/sodium silicate, temperature, water content, pH value, and applying shearing flow were explored in detail to tailor the morphologies of the SBA-15 mesoporous silicas. In this paper, we also focused on the counterion effect on the synthesis of the SBA-15 mesoporous silicas. It was found that the SO42− counterion from H2SO4 has higher affinity to induce the formation of P123 rod-like micelles than that of Cl, NO3. Meanwhile, we postulated that the self-assembly pathway of the silica species and the neutral tri-block copolymer micelles in a dilute solution with a pH value of 2.0 would occur through an S0···I0 rather than the S0X−…I+ one as previously discussed. We further employed the SAB-15 mesoporous silica rods as the templates to synthesize high-quality CMK-3 mesoporous carbon rods by using commercially available phenol–formaldehyde (PF) resin as the carbon source.

Keywords

Mesoporous Silica Mesoporous Carbon Sodium Silicate Solution Acid Source Silica Species 

Notes

Acknowledgements

Authors thank Chung-Chun Plastic, Taiwan, for providing PF polymers. This research is financially supported by National Science Council of Taiwan (NSC95-2113-M-006-011-MY3 and NSC95-2323-B-006-008) and Taiwan Textile Research Institute and Landmark Project from National Cheng Kung University (R017).

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Copyright information

© Springer Science+Business Media, LLC 2009

Authors and Affiliations

  • Man-Chien Chao
    • 1
  • Chia-Hsien Chang
    • 2
  • Hong-Ping Lin
    • 2
    Email author
  • Chih-Yuan Tang
    • 3
  • Ching-Yen Lin
    • 3
  1. 1.Department of ChemistryNational Taiwan UniversityTaipeiTaiwan
  2. 2.Department of Chemistry and Center for Micro/Nano Science and TechnologyNational Cheng Kung UniversityTainanTaiwan
  3. 3.Instrumentation CenterNational Taiwan UniversityTaipeiTaiwan

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