Skip to main content Accessibility help
×
Home

Transparent Monolithic Metal Ion Containing Nanophase Aerogels

  • William M. Risen (a1), Xiangjun Hu (a1), Shuang Ji (a1) and Kenneth Littrell (a2)

Abstract

The formation of monolithic and transparent transition metal containing aerogels has been achieved through cooperative interactions of high molecular weight functionalized carbohydrates and silica precursors, which strongly influence the kinetics of gelation. After initial gelation, subsequent modification of the ligating character of the system, coordination of the group VIII metal ions, and supercritical extraction afford the aerogels. The structures at the nanophase level have been probed by photon and electron transmission and neutron scattering techniques to help elucidate the basis for structural integrity together with the small entity sizes that permit transparency in the visible range. They also help with understanding the chemical reactivities of the metal-containing sites in these very high surface area materials. These results are discussed in connection with new reaction studies.

Copyright

References

Hide All
1. Wang, Y., Liu, H. and Jiang, Y, J. Chem. Soc. Chem. Commun. 1878 (1989)
2. Tour, J. M., Pendalwar, S. L. and Cooper, J. P., Chem. Mater, 2, 47 (1990).
3. Buckley, A. M. and Greenblatt, M., J. Noncryst. Solids, 146, 97 (1992).
4. Baiker, A., Grunwaldt, J-D., Muller, C. A. and Schmid, L., Chimia 52, 517 (1998).
5. Yang, A., Industrial Science and Technology Network, Inc., private communication.
6. Brack, H. P., Ph. D. Thesis, Brown University, 1994.
7. Brack, H. P., Tirmizi, S. A. and Risen, W. M. Jr, Polymer 38, 151 (1996).
8. Hu, X., Ji, S., Zhang, R., Pickles, D., and Risen, W. M. Jr, to be published.
9. Ji, S., Hu, X., and Risen, W. M., Jr, to be published.
10. Hu, X., Ji, S., Littrell, K., Pickles, D., and Risen, W. M. Jr, to be published.
11. Teixeira, J., J. Appl. Cryst., 21, 781 (1988).
12. Pedersen, J. S., Adv. in Colloid and Interface Sci., 70, 171 (1997).
13. Freltoft, T., Kjems, J. K., and Sinha, S. K., Phys. Rev. B, 33, 269 (1986).
14. Shim, I. W., Mattera, V. D. Jr and Risen, W. M. Jr, Catalysis, 94, 531 (1985).
15. Mattera, V. D. Jr, Barnes, D. M., Chaudhuri, S. N., Gonzalez, R. D., and Risen, W. M. Jr, J. Phys. Chem., 90, 4819 (1986).
16. Yates, J. T. Jr, Duncan, T. M., Worley, S. D., and Vaughn, R. W., J. Chem. Phys. 70, 1219 (1979).
17. Kellner, C. S. and Bell, A. T., J. Catalysis, 75, 251 (1982).

Transparent Monolithic Metal Ion Containing Nanophase Aerogels

  • William M. Risen (a1), Xiangjun Hu (a1), Shuang Ji (a1) and Kenneth Littrell (a2)

Metrics

Full text views

Total number of HTML views: 0
Total number of PDF views: 0 *
Loading metrics...

Abstract views

Total abstract views: 0 *
Loading metrics...

* Views captured on Cambridge Core between <date>. This data will be updated every 24 hours.

Usage data cannot currently be displayed