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PGSE-NMR & Sans from TPB Based Microemulsions

Published online by Cambridge University Press:  21 February 2011

Paul M. Lindemuth ,
Boualem Hammouda ,
Joseph R. Duke ,
Frank D. Blum  and
Raymond L. Venable
Paul M. Lindemuth
Affiliation:
University of Missouri-Rolla, Department of Chemistry, Rolla, MO, 65401
Boualem Hammouda
Affiliation:
University of Missouri-Columbia, Research Reactor Facility, Columbia, MO, 65211
Joseph R. Duke
Affiliation:
University of Missouri-Rolla, Department of Chemistry, Rolla, MO, 65401
Frank D. Blum
Affiliation:
University of Missouri-Rolla, Department of Chemistry, Rolla, MO, 65401
Raymond L. Venable
Affiliation:
University of Missouri-Rolla, Department of Chemistry, Rolla, MO, 65401
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Abstract

Self-diffusion coefficients from pulsed-gradient spin-echo NMR are reported for four components of the tetradecylpyridinium bromide - 85% heptane/15% pentanol - water pseudoternary system. Measurements were taken throughout the inverted microemulsion region and also in a small isotropic region beyond the domain of lamellar liquid crystals. Observations of the self-diffusion coefficients for water relative to those of the surfactant, oil and alchohol show several distinct structural transitions within the water-in-oil region of the phase diagram. The smaller isotropic region exhibits a complete inversion of phase relative to the water-in-oil region. Conductivity measurements were used to further clarify the NMR data. Subsequent small angle neutron scattering (SANS) measurements on the same system show the transition from the single particle (heavy water + Stern layer droplet) scattering regime at low water concentration to the mixed single/interdroplet scattering regime when the intermicellar distance becomes comparable to the size of the micelles.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 177: Symposium V – Macromolecular Liquids , 1989 , 117
Copyright
Copyright © Materials Research Society 1990

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References

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