| Budget Amount *help |
¥3,000,000 (Direct Cost: ¥3,000,000)
Fiscal Year 1998: ¥1,100,000 (Direct Cost: ¥1,100,000)
Fiscal Year 1997: ¥1,900,000 (Direct Cost: ¥1,900,000)
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| Research Abstract |
Adsolubilization and fluorescence quenching measurements revealed formation of surfactant aggregates in zeolite-surfactant complexes. A dye, rhodamine B, adsorbed not on zeolite but on zeolite-surfactant complexes. This is ascribed to solubilization by surfactant aggregates formed in the complexes, that is, "adsolubilization". The thermodynamic functions for the adsolubilization equilibrium were determined as a function of surfactant content in the complexes.
Sodium ions of kanemite crystal were exchanged with cationic surfactant micelles and a folded sheet mesoporous crystal (FSM) was obtained. It has homogeneous and regularly oriented pores of nanometer. An enhanced energy transfer from an excited pyrene to proflavine, both adsolubilized in the FSM/surfactant complexes, was observed. The pyrene fluorescence was quenched in the presence of proflavine and the fluorescence of proflavine was observed, when only the pyrene was excited. Data analysis of this energy transfer revealed the formation of relatively large aggregates of surfactant with over 200 surfactant ions. XRI) measurements showed an increasing basal distance as the surfactant increases the chain length.
A layered film of silica/surfactant complex was synthesized on a glass plate by the use of sol-gel reaction. The fluorescence spectra and depolarization of probes adsolubilized in the complex film were determined. The probes used were pyrene, anthracene, phenanthrene, rhodamine B, rhodamine 6G, and acridine orange. The depolarization data suggest that the probes are still mobile in the FSM/surfactant complex film. The quenching of pyrene fluorescence was observed in the presence of hexadecylpyridinium ions. The data analysis revealed not the Stem-Volmer type but the Forster type energy transfer. This finding suggested a restricted translational diffusion of the probes in the FSM/surfactant film.
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