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Study of core-shell structure of cesium dodecylsulfate micelles using small-angle X-ray and neutron scattering

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Title Study of core-shell structure of cesium dodecylsulfate micelles using small-angle X-ray and neutron scattering
 
Creator KANUNGO, S
NARAYANAN, J
ASWAL, VK
BELLARE, JR
GOYAL, PS
 
Subject Cesium dodecylsulfate
Micelle
Core-shell structure
Small-angle X-ray scattering
Small-angle neutron scattering
SURFACTANT MICELLES
AQUEOUS-SOLUTION
COUNTERION
SODIUM
CONDENSATION
AGGREGATION
TEMPERATURE
IONIZATION
CHARGE
 
Description Small-angle X-ray and neutron scattering (SAXS and SANS) measurements were carried out to study core-shell structure of cesium dodecylsulfate (CsDS) micelles in aqueous solutions at different temperatures and surfactant concentrations and in the presence of salts. Data analysis shows that the micelles are prolate ellipsoid in shape. Assuming the semi-minor axis of the core to be equal to the fully extended length of the hydrocarbon chain, the values of semi-major axis, shell thickness, aggregation number and fractional charge on the micelle were obtained from SAXS data and compared with those obtained from SANS data. It is seen that while shell thickness is independent of surfactant concentration, the micelle size increases with increase in surfactant concentration. Micelle size and shell thickness decrease with increase in temperature. Addition of salts (sodium chloride or cesium chloride) results in growth of micelles with reduction of fractional charge on the micelle. The micelle size obtained by SANS is larger than that obtained by SAXS when CsDS solutions are prepared in H2O for SAXS experiments and in D2O for SANS experiments. However, results obtained in SAXS experiment using D2O as solvent agree remarkably with those obtained using SANS. (C) 2012 Elsevier B.V. All rights reserved.
 
Publisher ELSEVIER SCIENCE BV
 
Date 2014-10-16T06:58:11Z
2014-10-16T06:58:11Z
2012
 
Type Article
 
Identifier JOURNAL OF MOLECULAR LIQUIDS, 17538-43
http://dx.doi.org/10.1016/j.molliq.2012.07.030
http://dspace.library.iitb.ac.in/jspui/handle/100/15493
 
Language en