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Spectroscopic Studies of Chemical Reactions and Dynamics inSol-Gel Matrices

Published online by Cambridge University Press:  21 February 2011

F. Akbarian ,
B. Dunnt ,
P.D. Fuquat ,
J. Mckiernan ,
E. Simoni  and
J.I. Zink
F. Akbarian
Affiliation:
Department of Chemistry and Biochemistry
B. Dunnt
Affiliation:
Department of Materials Science and Engineering University of California, Los Angeles 90024
P.D. Fuquat
Affiliation:
Department of Materials Science and Engineering University of California, Los Angeles 90024
J. Mckiernan
Affiliation:
Department of Chemistry and Biochemistry
E. Simoni
Affiliation:
Department of Chemistry and Biochemistry
J.I. Zink
Affiliation:
Department of Materials Science and Engineering University of California, Los Angeles 90024
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Abstract

The synthesis of sol-gel glasses containing organic and organometallicmolecular dopants has been well established as an approach for creating newoptical materials. Some of these properties are dependent upon chemicalreactions which occur in porous xerogel matrices during the sol-gel processor when encapsulated molecules are exposed to other molecules in solution.In this paper, the study of two different types of chemical reactions in thepores of xerogel matrices is reported. In one case copper phthalocyanine isused to characterize dimerization within the pores. The results show thatdimer formation is most likely to occur towards the end of the drying stageas the dye concentration in the pores increases from solvent evaporation. Asecond example involves the use of a pump-probe technique to determine therate of proton recombination inside the pores of silica monoliths. Thebehavior of sols and gels is similar to aqueous solution while recombinationof protons in the xerogel seems to be affected by the walls of thepores.

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Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 346: Symposium N – Better Ceramics Through Chemistry VI , 1994 , 559
Copyright
Copyright © Materials Research Society 1998

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References

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