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Issue 45, 2013
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Anisotropic dynamics of guest molecules in aerosol OT lamellar structures

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Abstract

The present work is focused on developing a description of an anisotropic microheterogeneous medium, exploiting the dynamics of a guest molecule. The medium in question is the lamellar structures formed in the aqueous layer of ternary mixtures containing aerosol OT (AOT), water and n-heptane. The guest used in this study is the fluorescent probe, coumarin 153 (C153). The dynamics of this molecule, within the lamellar structure, have been studied using a combination of steady state and time resolved fluorescence, as well as fluorescence correlation spectroscopy (FCS). The fluorophore is strongly solvatochromatic and so, the wavelength of excitation can be tuned so as to selectively excite fluorescent molecules residing in different regions of the microheterogeneous media, even if the spatial separation between these regions is below the diffraction limit. The excitation wavelength in the present experiments is chosen so as to exclusively excite those C153 molecules that reside in the hydrophobic region of the lamellar structures. This triggers two different modes of diffusion, one along and the other perpendicular to the bilayers of the AOT. Thus, the dynamics of the fluorescent probe provide an elegant manifestation of the anisotropy of the host medium.

Graphical abstract: Anisotropic dynamics of guest molecules in aerosol OT lamellar structures

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Publication details

The article was received on 06 Jun 2013, accepted on 18 Sep 2013 and first published on 18 Sep 2013


Article type: Paper
DOI: 10.1039/C3CP52372A
Phys. Chem. Chem. Phys., 2013,15, 19724-19729

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    Anisotropic dynamics of guest molecules in aerosol OT lamellar structures

    D. De, M. Sajjan and A. Datta, Phys. Chem. Chem. Phys., 2013, 15, 19724
    DOI: 10.1039/C3CP52372A

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