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

Content Provider	Springer Nature Link
Author	Bangi, Uzma K. H. Kavale, M. S. Baek, Seungsu Park, Hyung Ho
Copyright Year	2012
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 m$^{2}$/g BET and 1,200 m$^{2}$/g Langmuir surface areas and 149$^{o}$ 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 Na$_{2}$SiO$_{3}$::H$_{2}$O::MWCNTs::citric acid::TMCS at 1::146.67::2.5 × 10$^{−3}$::0.54::9.46 respectively with improved mechanical strength.
Starting Page	201
Ending Page	207
Page Count	7
File Format	PDF
ISSN	09280707
Journal	Journal of Sol-Gel Science and Technology
Volume Number	62
Issue Number	2
e-ISSN	15734846
Language	English
Publisher	Springer US
Publisher Date	2012-02-24
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Sodium silicate MWCNTs Doping Mechanical strength Ambient pressure drying Ceramics, Glass, Composites, Natural Methods Nanotechnology Optical and Electronic Materials Inorganic Chemistry
Content Type	Text
Resource Type	Article
Subject	Ceramics and Composites Chemistry Materials Chemistry Biomaterials Condensed Matter Physics Electronic, Optical and Magnetic Materials

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