Journal of Sol-Gel Science and Technology

, Volume 48, Issue 1, pp 113–134

Synthesis and characterization of the physical, chemical and mechanical properties of isocyanate-crosslinked vanadia aerogels

  • H. Luo
  • G. Churu
  • E. F. Fabrizio
  • J. Schnobrich
  • A. Hobbs
  • A. Dass
  • S. Mulik
  • Y. Zhang
  • B. P. Grady
  • A. Capecelatro
  • C. Sotiriou-Leventis
  • H. Lu
  • N. Leventis
Original Paper

DOI: 10.1007/s10971-008-1788-y

Cite this article as:
Luo, H., Churu, G., Fabrizio, E.F. et al. J Sol-Gel Sci Technol (2008) 48: 113. doi:10.1007/s10971-008-1788-y

Abstract

A strong lightweight material (X-VOx) was formulated by nanocasting a conformal 4 nm thin layer of an isocyanate-derived polymer on the entangled worm-like skeletal framework of typical vanadia aerogels. The mechanical properties were characterized under both quasi-static loading conditions (dynamic mechanical analysis, compression and flexural bending testing) as well as high strain rate loading conditions using a split Hopkinson pressure bar (SHPB). The effects of mass density, moisture concentration and low temperature on the mechanical properties were determined and evaluated. Digital image correlation was used to measure the surface strains through analysis of images acquired by ultra-high speed photography, indicating nearly uniform compression at all stages of deformation during compression. The energy absorption of X-VOx was plotted as a function of the density, strain rate and temperature, and compared with that of plastic foams. X-VOx remains ductile even at −180 °C, a characteristic not found in most materials. This unusual ductility is derived from interlocking and sintering-like fusion of nanoworms during compression. X-VOx emerges as an ideal material for force protection under impact.

Keywords

Crosslinked vanadia aerogel Nano-foam Cryogenic temperature Specific energy absorption Split Hopkinson pressure bar Digital image correlation 

Copyright information

© Springer Science+Business Media, LLC 2008

Authors and Affiliations

  • H. Luo
    • 1
  • G. Churu
    • 1
  • E. F. Fabrizio
    • 2
  • J. Schnobrich
    • 3
  • A. Hobbs
    • 3
  • A. Dass
    • 4
  • S. Mulik
    • 4
  • Y. Zhang
    • 1
  • B. P. Grady
    • 5
  • A. Capecelatro
    • 6
  • C. Sotiriou-Leventis
    • 4
  • H. Lu
    • 1
  • N. Leventis
    • 3
    • 4
  1. 1.School of Mechanical and Aerospace EngineeringOklahoma State UniversityStillwaterUSA
  2. 2.Ohio Aerospace InstituteClevelandUSA
  3. 3.NASA Glenn Research CenterClevelandUSA
  4. 4.Department of ChemistryMissouri University of Science and TechnologyRollaUSA
  5. 5.School of Chemical, Biological, and Materials EngineeringUniversity of OklahomaNormanUSA
  6. 6.Department of Materials ScienceUCLALos AngelesUSA

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