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Synthesis of MWCNTs doped sodium silicate based aerogels by ambient pressure drying

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Abstract

The successful incorporation of multiwalled carbon nanotubes (MWCNTs) into silica aerogels prepared by sol–gel method is reported herein. Pure silica aerogels prepared using sodium silicate precursor by ambient pressure drying are so fragile that they cannot be used easily. MWCNTs were used as reinforcements to improve the mechanical properties of silica aerogels. Results show that inserting small amounts of MWCNTs in the gels causes enhanced dimensional stability of silica aerogels. The silica aerogels were prepared by doping MWCNTs in silica matrix before gelation. The influence of MWCNTs on some microstructural aspects of silica matrix has been studied using nitrogen adsorption–desorption isotherms. From SEM study it is confirmed that the silica particles get capped on the surface of MWCNTs suggesting an enhanced toughness. Further, FTIR, Raman, EDAX, thermal conductivity and hydrophobicity studies of these doped aerogels were carried out. By addition of MWCNTs, silica aerogels were formed with 706 m2/g BET and 1,200 m2/g Langmuir surface areas and 149o contact angle. Low density (0.052 g/cc) and low thermal conductivity (0.067 W/m K) MWCNTs doped silica aerogels were obtained for the molar ratio of Na2SiO3::H2O::MWCNTs::citric acid::TMCS at 1::146.67::2.5 × 10−3::0.54::9.46 respectively with improved mechanical strength.

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Acknowledgment

This study was supported by a grant from DAPA and ADD, Republic of Korea. One of the authors Uzma K. H. Bangi is highly grateful to the BK office for the financial support through post-doctorate fellowship.

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Authors and Affiliations

  1. Department of Materials Science and Engineering, Yonsei University, Seoul, 120-749, Korea

    Uzma K. H. Bangi & Hyung-Ho Park

  2. Agency for Defense Development, Daejeon, 305-600, Republic of Korea

    Seungsu Baek

  3. Department of Physics, Shivaji University, Kolhapur, 413006, Maharashtra, India

    M. S. Kavale

Authors
  1. Uzma K. H. Bangi
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  2. M. S. Kavale
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  3. Seungsu Baek
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  4. Hyung-Ho Park
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Correspondence to Hyung-Ho Park.

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Bangi, U.K.H., Kavale, M.S., Baek, S. et al. Synthesis of MWCNTs doped sodium silicate based aerogels by ambient pressure drying. J Sol-Gel Sci Technol 62, 201–207 (2012). https://doi.org/10.1007/s10971-012-2710-1

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  • DOI: https://doi.org/10.1007/s10971-012-2710-1

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