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Issue 25, 2014
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The influence of charge on the structure and dynamics of water encapsulated in reverse micelles

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Abstract

Hydrogen-bonded structure and relaxation dynamics of water entrapped inside reverse micelles (RMs) composed of surfactants with different charged head groups: sodium bis(2-ethylhexyl) sulfosuccinate (AOT) (anionic), didodecyldimethylammonium bromide (DDAB) (cationic) and Igepal CO-520 (Igepal) (nonionic) in cyclohexane (Cy) have been studied as a function of hydration (defined by Image ID:c4cp00386a-t1.gif). Sub-diffusive slow (sub-ns) relaxation dynamics of water has been measured by the time resolved fluorescence spectroscopy (TRFS) technique using two fluorophores, namely 8-anilino-1-naphthalenesulfonic acid (ANS) and coumarin-343 (C-343). The hydrogen bonded connectivity network of water confined in these RMs has been investigated by monitoring the hydrogen bond stretching and libration bands of water using far-infrared FTIR spectroscopy. In addition, the ultrafast collective relaxation dynamics of water inside these RMs has been determined by dielectric relaxation in the THz region (0.2–2.0 THz) using THz time domain spectroscopy (THz-TDS). While TRFS measurements establish the retardation of water dynamics for all the RM systems, FTIR and THz-TDS measurements provide with signature of charge specificity.

Graphical abstract: The influence of charge on the structure and dynamics of water encapsulated in reverse micelles

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Article information


Submitted
25 Jan 2014
Accepted
12 May 2014
First published
12 May 2014

Phys. Chem. Chem. Phys., 2014,16, 12875-12883
Article type
Paper

The influence of charge on the structure and dynamics of water encapsulated in reverse micelles

A. Patra, T. Q. Luong, R. K. Mitra and M. Havenith, Phys. Chem. Chem. Phys., 2014, 16, 12875
DOI: 10.1039/C4CP00386A

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