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Thermal Conductivity of Nanocomposite Silicon Aerogels

[+] Author Affiliations
Benjamin L. Lawson, Taofang Zeng

North Carolina State University, Raleigh, NC

Paper No. IMECE2003-41308, pp. 217-218; 2 pages
doi:10.1115/IMECE2003-41308
From:
  • ASME 2003 International Mechanical Engineering Congress and Exposition
  • Heat Transfer, Volume 4
  • Washington, DC, USA, November 15–21, 2003
  • Conference Sponsors: Heat Transfer Division
  • ISBN: 0-7918-3718-1 | eISBN: 0-7918-4663-6, 0-7918-4664-4, 0-7918-4665-2
  • Copyright © 2003 by ASME

abstract

We have developed a novel nanoengineering method to prepare modified silica aerogels, in which a small amount (less than 10%) of water-soluble organic is added. The molecular-level synergism between silica nanoparticles and molecular cross-linkers inverts the relative host-guest roles in glass-polymer composites, leading to new strong low-density materials. The synthesized composite monoliths are much more robust than the pure silica. The mechanical strength of the aerogels synthesized is measured using the 3-point bending, and the apparent thermal conductivity is measured using the hot wire method. The elasticity of the nanocomposite is significantly reduced (i.e., the rigidity is reduced) and rapture strength.is increased. The thermal conductivity of the nancomposite is increased slightly.

Copyright © 2003 by ASME

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