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Bulk and Surface Structure of a Ternary Microemulsion

Published online by Cambridge University Press:  22 February 2011

D. D. Lee ,
S. H. Chen ,
S. K. Satija  and
C. F. Majkrzak
D. D. Lee
Affiliation:
Dept. of Physics, Massachusetts Institute of Technology, Cambridge, MA
S. H. Chen
Affiliation:
Dept. of Nuclear Engineering, Massachusetts Institute of Technology, Cambridge, MA
S. K. Satija
Affiliation:
Reactor Radiation Division, National Institute of Standards and Technology, Gaithersburg, MD
C. F. Majkrzak
Affiliation:
Reactor Radiation Division, National Institute of Standards and Technology, Gaithersburg, MD
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Abstract

Microemulsions are isotropic mixtures of water, oil, and surfactant which self-assemble to form interfacial monolayers with a characteristic length scale on the order of hundreds of Angstroms. Small angle neutron scattering was used to determine the bulk structure of a wateroctane-C10E4 bicontinuous microemulsion. The mean curvature of the surfactant film was verified to be near zero by independently measuring the scattering contributions from the water-surfactant and oil-surfactant interfaces through hydrogen-deuterium contrast variation. The exponentially damped, oscillatory scattering length density profile of the microemulsion near a hydrophobic silicon surface was also observed with neutron reflectivity. The surface reflectivity results as well as the bulk small angle scattering measurements are explained using a simple Ginzburg-Landau theory.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 376: Symposium BB – Neutron Scattering in Materials Science , 1994 , 241
Copyright
Copyright © Materials Research Society 1995

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References

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