Spectroscopic studies of chemical reactions and dynamics in sol-gel matrices

Book · Sat Dec 31 04:00:00 EST 1994

OSTI ID:51614

Akbarian, F; Dunn, B; Fuqua, P D; McKiernan, J; Simoni, E; Zink, J I ^[1]

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1. Univ. of California, Los Angeles, CA (United States)

The synthesis of sol-gel glasses containing organic and organometallic molecular dopants has been well established as an approach for creating new optical materials. Some of these properties are dependent upon chemical reactions which occur in porous xerogel matrices during the sol-gel process or when encapsulated molecules are exposed to other molecules in solution. In this paper, the study of two different types of chemical reactions in the pores of xerogel matrices is reported. In one case copper phthalocyanine is used to characterize dimerization within the pores. The results show that dimer formation is most likely to occur towards the end of the drying stage as the dye concentration in the pores increases from solvent evaporation. A second example involves the use of a pump-probe technique to determine the rate of proton recombination inside the pores of silica monoliths. The behavior of sols and gels is similar to aqueous solution while recombination of protons in the xerogel seems to be affected by the walls of the pores.

• OSTI ID: 51614
• Report Number(s): CONF-940411--; ISBN 1-55899-246-4
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
40 CHEMISTRY
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
COMPOSITE MATERIALS
DIFFUSION
DIMERIZATION
DOPED MATERIALS
EXPERIMENTAL DATA
OPTICAL PROPERTIES
ORGANOMETALLIC COMPOUNDS
PROTONS
SILICA GEL
SYNTHESIS