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On the validity of fluorescence decay used as a technique to measure internal microviscosity in reverse micelles

par Zenkouar, Mohamed;Boué, Stéphane ;Vander Donckt, Emile
Référence Journal of colloid and interface science, 125, 2, page (508-515)
Publication Publié, 1988

Article révisé par les pairs

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Résumé :

Analysis of the fluorescence decay of a probe dissolved in the water core of reverse micelles has been reported as a means to measure the internal microviscosity of water under the assumption of a homogeneous distribution of the probe. We have carried out a computer analysis which shows that divergence from homogeneity associated with solvation enthalpy changes ΔGo as small as 0.5 kJ mole-1 is sufficient to affect significantly the fluorescence response of the system. There are known examples of non-homogeneous distribution of a solute within the water pool of a reverse micelle and we are led to conclude that if a homogeneous distribution of the excited probe is to be assumed, then the decay of its fluorescence is an unreliable technique for studying the microscopic internal properties of reverse micelles. © 1988.