Hostname: page-component-7479d7b7d-qlrfm Total loading time: 0 Render date: 2024-07-10T13:28:48.340Z Has data issue: false hasContentIssue false
  • English
  • Français

Chemically Selective Reactions in Confined Spaces in Hybrid Aerogels

Published online by Cambridge University Press:  26 February 2011

Xipeng Liu ,
Chunhua Yao  and
William M Risen Jr.
Xipeng Liu
Affiliation:
xipeng_Liu@brown.edu, Brown University, Chemistry, United States
Chunhua Yao
Affiliation:
Chunhua_Yao@Brown.edu, Brown University, Chemistry, United States
William M Risen Jr.
Affiliation:
wrisen@brown.edu, Brown University, Chemistry, United States
Get access

Abstract

By employing novel hybrid silica/functional polymer aerogels, control of the course of chemical reactions between reactants confined inside of the aerogels with reactants whose access to the confinement domain is controlled by diffusion has been explored. Thus, monolithic silica/biopolymer hybrid aerogels have been synthesized with coordinated metal ions that can react with amino acids, such as L-cysteine, that are provided externally in a surrounding solution. Metal ions, such as Au(III), that can react in solution with the amino acid to produce one set of products under a given set of stoichiometric or concentration conditions, and a different set of products under a second set of conditions, were selected for incorporation into the aerogel. It was discovered that the course of the reaction can be changed by spatial confinement of the reaction domain in the aerogel. For example, in the case of Au(III) and L-cysteine, the Au(III) ions are confined in nanoscale domains, and when they are reacted with the amino acid, the nature of the reaction products is controlled by diffusion of the L-cysteine into the domains. Exploration of these and related phenomena will be presented.

Keywords

aerogelchemical reactiondiffusion
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 899: Symposium N – Dynamics in Small Confining Systems VIII , 2005 , 0899-N06-06
Copyright
Copyright © Materials Research Society 2006

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

REFERENCES

1. Husing, N., and Schubert, U., Angew Chem. Int. Ed. 1998, 37, 22–45 Google Scholar
2. Pierre, A. C., and Pajonk, G. M., Chem. Rev. 2002, 102, 4243–4265 Google Scholar
3. Hu, X., Ji, S., Littrell, K., Risen, W. M. Jr., Mater. Res. Soc. Symp. Proc. 2000, 581, 353–362,Google Scholar
4. Hu, X., Littrell, K., Ji, S., Pickles, D. and Risen, W. M. Jr., J. Non-Cryst. Solids 2001, 288, 184 Google Scholar
5. Liu, X., Zhu, Y., Yao, C., Risen, W. M. Jr., Mat. Res. Soc. Symp. Proc. 2004, Vol.788, L2.1 Google Scholar
6. Shaw III, C.F., Shmitz, G.,Thompson, H.O., Witkiewicz, P., J. Inorg. Biochem. 1979, 10, 317–330 Google Scholar
7. Shaw, C.F. III, Cancro, M.P., Witkiewicz, P.L., and Eldrige, J.E., Inorg. Chem., 1980, 19, 3198–3201 Google Scholar
8. Xipeng Liu, , Ph.D thesis, Brown University, 2005 Google Scholar
9. Klug, H. P., Alexander, L. E., X-ray Diffraction Procedures for Polycrystalline and Amorphous Materials, Wiley, New York, 1954 Google Scholar
10. Brust, M., Fink, J., Bethell, D., Schiffrin, D.J. and Kiely, C., J. Chem. Soc., Chem. Commun., 1995, 1655–1656 Google Scholar
11. Naka, K., Itoh, H., Tampo, Y., Chujo, Y., Langmuir, 2003, 19, 5546–5549 Google Scholar