Hostname: page-component-78c5997874-mlc7c Total loading time: 0 Render date: 2024-11-13T13:34:57.728Z Has data issue: false hasContentIssue false
  • English
  • Français

Photochemical Studies Using Organic-Inorganic Sol-Gel Materials

Published online by Cambridge University Press:  15 February 2011

B. C. Dave ,
F. Akbarian ,
B. Dunn  and
J. I. Zink
B. C. Dave
Affiliation:
Department of Materials Science and Engineering, University of California, Los Angeles, CA 90095. Department of Chemistry and Biochemistry, University of California, Los Angeles, CA 90095.
F. Akbarian
Affiliation:
Department of Chemistry and Biochemistry, University of California, Los Angeles, CA 90095.
B. Dunn
Affiliation:
Department of Materials Science and Engineering, University of California, Los Angeles, CA 90095.
J. I. Zink
Affiliation:
Department of Chemistry and Biochemistry, University of California, Los Angeles, CA 90095.
Get access

Abstract

The flexible solution chemistry of the sol-gel process has been used to encapsulate a wide variety of organic, organometallic, and biomolecules in inorganic solids. This paper reviews different types of photochemical reactions which we have used to produce specific products or to generate oxygen within sol-gel matrices. By controlling synthesis conditions, the molecules can be made to exhibit desired reactivities when trapped in the sol-gel matrix.

Three different examples of photochemical reactions are presented in this paper. An organometallic gold precursor compound, dimethyl (hexafluoroacetylacetonato)gold, dissolved in a silicate sol is used to produce gold nanoparticles of desired sizes. The second example is based on sol-gel encapsulated photochromic (and thermochromic) spiropyran, that converts to a colored form using thermal energy or UV radiation. The synthesis strategies for selectively isolating the colored or the colorless form in sol-gel materials are presented. Materials of these types may be useful in writeonce- read-many (WORM) optical data storage applications. The third example involves sol-gel matrices doped with a biosystem, the green plant photosystem H (PS II). The resulting aged gels and xerogels are photoactive and are capable of photooxidizing water. Oxygen illumination was measured under white light and there is an indication that PS II particles are stabilized by the encapsulation process.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 435: Symposium V – Better Ceramics Through Chemistry VII , 1996 , 565
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. Zink, J. I., Valentine, J. S., and Dunn, B., New J. Chem. 18, 1109 (1994).Google Scholar
2. Dunn, B., and Zink, J. I., J. Mater. Chem. 1, 903 (1991).Google Scholar
3. Avnir, D., Braun, S., Lev, O., and Ottolenghi, M., Chem. Mater. 6, 1605 (1994).Google Scholar
4. Hench, L. L., and West, J. K., Chem. Rev. 90, 33 (1990).Google Scholar
5. Fox, M. A., Photochem. Photobiol. 52, 617 (1990).Google Scholar
6. Ramamurthy, V., Weiss, R. G., and Hammond, G. S. Adv. Photochem. 18, 67, (1993).Google Scholar
7. Cauqui, M. A., and Rodriguez-Izquierdo, J. M., J. Non-Cryst. Solids, 147–8, 724 (1992).Google Scholar
8. Lopez, T., Herrera, L., Mendez-Vivar, J., Gomez, R., and Gonzalez, R. D., J. Non-Cryst. Solids 147–8, 753 (1992).Google Scholar
9. Akbarian, F., Dunn, B., and Zink, J. I., J. Phys. Chem. 99, 3982 (1995).Google Scholar
10. Mie, G., Ann. Phys 25, 377, (1908).Google Scholar
11. Bertelson, R. C. in Techniques of Chemistry, Vol III: “Photochromism”, Brown, G. H., Ed., Wiley-Interscience, New York, (1971), p 100.Google Scholar
12. Lan, E. H., Dave, B. C., Dunn, B., Valentine, J. S., and Zink, J. I., MRS Symp Proc. (1995).Google Scholar
13. Preston, D., Novinson, T., Kaska, W. C., Dunn, B., and Zink, J. I., J. Phys. Chem. 94, 4167 (1990).Google Scholar
14. Evans, T. R., Toth, A. F., and Leermakers, P. A., J. Am. Chem. Soc. 89, 5060 (1967)Google Scholar
15. Levy, D., and Avnir, D., J. Phys. chem. 92, 4737 (1988).Google Scholar
16. Ueda, M., Kim, H.-B., and Ichimura, K., J. Mater. Chem. 4, 883 (1994).Google Scholar
17. Dave, B. C., Dunn, B., Valentine, J. S., and Zink, J. I., Anal. Chem. 66, 1120A (1994).Google Scholar
18. Renger, G., Angew. Chem., Int. Ed. Engl. 26, 643 (1987).Google Scholar
19. Berthold, D. A., Babcock, G. T., and Yocum, C. F., FEBS Lett, 134, 231 (1981).Google Scholar