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Erschienen in:
Generation of Nanodroplets and Its Applications Kapitel lesen Erstes Kapitel lesen

2013 | OriginalPaper | Buchkapitel

11. Reactive Dynamics in Confined Water by Reversed Micelles

verfasst von : Minako Kondo, Ismael A. Heisler, Stephen R. Meech

Erschienen in: Nanodroplets

Verlag: Springer New York

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Abstract

The excited state reactive dynamics of the fluorescence dye molecule, Auramine O, were studied in the confined water environment in reversed micelles formed by ionic and nonionic surfactants. The fluorescence decays were measured by the fluorescence up-conversion method with a time resolution of <70 fs. The time-resolved fluorescence spectra were recreated and analysed using a one-dimensional generalised Smoluchowski equation assuming a time-dependent diffusion coefficient. The fluorescence decay times measured showed a dependence on water droplet sizes, and the reaction time was significantly slowed down in the smallest reversed micelles by both ionic AOT and nonionic surfactant. The reactive friction estimated from the Smoluchowski analysis was enhanced in the confined media which shows good agreement with the reaction times. Therefore, we found out that the interfacial charges are not required for the suppression of the reaction. Interestingly, the slower reaction dynamics were measured in nonionic surfactant reversed micelles than that in reversed micelles by AOT, even when Auramine O is in a similar size of water droplet.

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Metadaten
Titel
Reactive Dynamics in Confined Water by Reversed Micelles
verfasst von
Minako Kondo
Ismael A. Heisler
Stephen R. Meech
Copyright-Jahr
2013
Verlag
Springer New York
Buch
Nanodroplets

Print ISBN: 978-1-4614-9471-3

Electronic ISBN: 978-1-4614-9472-0

Copyright-Jahr: 2013

DOI
https://doi.org/10.1007/978-1-4614-9472-0_11

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