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Anisotropic dynamics of guest molecules in aerosol OT lamellar structures

DSpace at IIT Bombay

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Title Anisotropic dynamics of guest molecules in aerosol OT lamellar structures
 
Creator DE, D
SAJJANZ, M
DATTA, A
 
Subject FLUORESCENCE CORRELATION SPECTROSCOPY
NORMALIZED EMISSION-SPECTROSCOPY
SOLVATION DYNAMICS
REVERSE MICELLES
ORGANIC-DYES
IONIC LIQUID
ROTATIONAL RELAXATION
PROTON-TRANSFER
WATER
DIFFUSION
 
Description 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.
 
Publisher ROYAL SOC CHEMISTRY
 
Date 2014-10-16T14:49:53Z
2014-10-16T14:49:53Z
2013
 
Type Article
 
Identifier PHYSICAL CHEMISTRY CHEMICAL PHYSICS, 15(45)19724-19729
1463-9076
1463-9084
http://dx.doi.org/10.1039/c3cp52372a
http://dspace.library.iitb.ac.in/jspui/handle/100/15827
 
Language en