Elastical Properties of Aerogels -a Sensitive Monitor of Structural Changes

  • J. Groß
  • J. Lukas
  • J. Fricke
  • F. Schwertfeger


We present two examples of tiny changes in the microstructure of silica aerogels. Firstly, the elastic modulus of supposedly identical samples dried in autoclaves of different volumes were examined. A higher elastic modulus resulted from drying in a smaller vessel. This was caused by a slightly larger amount of water relative to the methanol content of the vessel, introduced with the samples. Secondly, the change of elastic modulus, mass and linear dimension of heat treated aerogel samples was measured. After heat treatment an elastical relaxation was observed that can be explained by chemisorption of water molecules.


Elastic Modulus Sound Velocity Silica Aerogel Follow Heat Treatment Ultrasonic Absorption 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.


  1. 1.
    J. Fricke (ed.), Aerogels (Proceedings of ISA 1), Springer Proceedings in Physics 6, Berlin 1985Google Scholar
  2. 2.
    R. Vacher, J. Phalippou, J. Pelous, T. Woignier (eds.), Proceedings of the 2nd International Symposium on Aerogels (ISA 2), Rev. Phys. Appl. 24, Colloque C4 (1989)Google Scholar
  3. 3.
    J. Fricke (ed.), Proceedings of ISA 3, J. NonCryst. Solids 145 (1992)Google Scholar
  4. 4.
    R.C. Mehrotra, in ref3, 1Google Scholar
  5. 5.
    R.W. Pekala, C.T. Alviso, F.M. Kong, S.S. Hulsey, in ref3, 90Google Scholar
  6. 6.
    X. Lu et. al., in ref3, 207Google Scholar
  7. 7.
    T.M. Tillotson, L.W. Hrubesh, in ref3, 44Google Scholar
  8. 8.
    A. Emmerling, J. Fricke, in ref3, 113Google Scholar
  9. 9.
    A. Bourret, Europhys. Lett. 6 (1988), 731CrossRefGoogle Scholar
  10. 10.
    C.M. Lampert, J.H. Mazur, in ref’, 154Google Scholar
  11. 11.
    F. Devreux, J.P. Boliot, F. Chaput, A. Lecomte, Mat. Res. Soc. Symp. Proc. 180 (1990), 211CrossRefGoogle Scholar
  12. 12.
    T. Woignier, J. Phalippou, H. Hdach, G.W. Scherer, Mat. Res. Soc. Symp. Proc. 180 (1990), 1087CrossRefGoogle Scholar
  13. 13.
    R.W. Pekala, L.W. Hrubesh, T.M. Tillotson, C.T. Alviso, J.F. Poco, J.D. LeMay, Mat. Res. Soc. Symp. Proc. 207 (1991), 197CrossRefGoogle Scholar
  14. 14.
    E. Courtens, J. Pelous, J. Phalippou, R. Vacher, T. Woignier, Phys. Rev. Lett. 58 (1987), 128CrossRefGoogle Scholar
  15. 15.
    J. Groß, J. Fricke, in ref3, 217Google Scholar
  16. 16.
    P.J. Davis, C.J. Brinker, D.M. Smith, J. NonCryst. Solids 142 (1992), 189CrossRefGoogle Scholar
  17. 17.
    G.W. Scherer, in: M.A. Aegerter, M. Jafelicci Jr., D.F. Souza, E.D. Zanotto (eds), Sol-Gel-Science and Technology, World Scientific, Singapore 1989, 153Google Scholar
  18. 18.
    E.M. Rabinovich, in: Sol Gel Technology for Thin Films, Fibers, Preforms, Electronics and Speciality Shapes, ed. by L. Klein, Noyers Publ., Perk Ridge, New Jersey, USA, 1988, 260; see also: R.K. Iler, The Chemistry of Silica, Wiley, N.Y., 1979Google Scholar
  19. 19.
    J. Groß, Mechanische Eigenschaften von Aerogel, Diploma Thesis, Physikalisches Institut der Universität Würzburg, 1987Google Scholar
  20. 20.
    G. Poelz, R. Riethmüller, Nucl. Instr. Methods Phys. Res. 195 (1982), 491CrossRefGoogle Scholar
  21. 21.
    T. Schlief, J. Groß, J. Fricke, in ref3, 223Google Scholar

Copyright information

© Springer Science+Business Media New York 1994

Authors and Affiliations

  • J. Groß
    • 1
  • J. Lukas
    • 1
  • J. Fricke
    • 1
  • F. Schwertfeger
    • 2
  1. 1.Physikalisches InstitutWürzburgGermany
  2. 2.Institut für Anorganische ChemieUniversität WürzburgWürzburgGermany

Personalised recommendations