Hostname: page-component-586b7cd67f-t7fkt Total loading time: 0 Render date: 2024-11-25T12:44:39.273Z Has data issue: false hasContentIssue false
  • English
  • Français

Organically Modified Silicate Aerogels, “Aeromosils”

Published online by Cambridge University Press:  10 February 2011

S. J. Kramer ,
F. Rubio-Alonso  and
J. D. Mackenzie
S. J. Kramer
Affiliation:
University of California, Department of Materials Science and Engineering, Los Angeles, CA 90095
F. Rubio-Alonso
Affiliation:
Instituto de Ceramica y Vidrio (CSIC), Metodos Fisico-Qimicos, Madrid, Spain
J. D. Mackenzie
Affiliation:
University of California, Department of Materials Science and Engineering, Los Angeles, CA 90095
Get access

Abstract

Aerogels derived from sol-gel oxides such as silica have become quite scientifically popular because of their extremely low densities, high surface areas, and their interesting optical, dielectric, thermal and acoustic properties. However, their commercial applicability has thus far been rather limited, due in great part to their brittleness and hydrophilicity. In prior work by our research group, modifying silicate gel structures with flexible, organic containing polymers such as polydimethylsiloxane imparted significant compliance (even rubbery behavior) and hydrophobicity. These materials have been referred to as Ormosils. This study expounds on our current efort to extend these desirable properties to aerogels, and in-so-doing, creating novel “Aeromosils”.

Reactive incorporation of hydroxy-terminal polydimethylsiloxane (PDMS) into silica sol-gels was made using both acid and two-step acid/base catalyzed processes. Aerogels were derived by employing the supercritical CO2 technique. Analyses of microstructure were made using nitrogen adsorption (BET surface area and pore size distribution), and some mechanical strengths were derived from tensile strength testing. Interesting Aeromosil properties obtained include optical transparency, surface areas of up to 1200 m2/g, rubberiness, and better strength than corresponding silica aerogels with elongations at break exceeding 5% in some cases.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 435: Symposium V – Better Ceramics Through Chemistry VII , 1996 , 295
Copyright
Copyright © Materials Research Society 1996

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

1. Novak, B.M., Auerbach, D., and Verrier, C., Chem. Mater. 6, 282–286 (1994).Google Scholar
2. Schubert, U., Schwertfeger, F., Husing, N., and Seyfreid, E., in Better Ceramics Through Chemistry VI (Mat. Res. Soc. Symp. Proc. 346, Pittsburgh, PA 1994) pp. 151–162.Google Scholar
3. (a) Smith, D.M., Deshpande, R., and Brinker, C.J. in Better Ceramics Through Chemistry V, edited by Hampden-Smith, M.J., Klemperer, W.G. and Brinker, C.J. (Mat. Res. Soc. Symp. Proc. 271, Pittsburgh, PA 1992) pp. 567–572; (b) R. Deshpande, D.M. Smith, and C.J.Google Scholar
4. (a) Loy, D.A., Shea, K.J. and Russick, E. M. in Better Ceramics Through Chemistry V, edited by Hampden-Smith, M.J., Klemperer, W.G. and Brinker, C.J. (Mat. Res. Soc. Proc. 271, Pittsburgh, PA 1992) pp. 699–704; (b) D.A. Loy G.M. Jamison, R.A. Assink, S. Myers, and K.J. Shea in Hybrid Organic-Inorganic Composites, edited by Mark, J.E., Lee, C.Y-C., and Bianconi, P.A. (Am. Chem. Soc. Symp. Ser. 585, Washington D.C. 1993) pp. 265–277.Google Scholar
5. Cao, W., and Hunt, A.J., in Better Ceramics Through Chemistry VI edited by (Mat. Res. Soc. Symp. Proc. 346, Pittsburgh, PA 1994) pp. 631–636.Google Scholar
6. Chung, Y.J. and Mackenzie, J.D., in Better Ceramics Through Chemistry IV, edited by Zelinski, B.J., Brinker, C.J., Clark, D.E. and Ulrich, D.R. (Mat. Res. Soc. Symp. Proc. 180, Pittsburgh, PA 1990) pp. 981–986.Google Scholar
7. Hu, Y. and Mackenzie, J.D., J. Mater. Sci. 27, 4415–4420 (1992).Google Scholar
8. Schmidt, H., J. Non-Cryst Sol. 63, 283–292 (1984).Google Scholar
9. Hrubesh, L.W., Tillotson, T.M., and Poco, J.F., in Chemical Processing of Advanced Materials, edited by Hench, L.L. and West, J.K. (John Wiley and Sons, New York 1992) pp. 19–27.Google Scholar
10. Iwamoto, T., Morita, K., and Mackenzie, J.D., J. Non-Cryst. Solids 159, 65 (1993).Google Scholar
11. Scherer, G. W., Smith, D.M., Qiu, X., and Anderson, J. M., J. Non-Cryst Solids 186, 316–320 (1995).Google Scholar