Self-diffusion in three-component, oil external microemulsions by forced Rayleigh scattering

William D. Dozier; Mahn Won Kim; Paul M. Chaikin

doi:10.1016/0021-9797(87)90073-7

Self-diffusion in three-component, oil external microemulsions by forced Rayleigh scattering

William D. Dozier, Mahn Won Kim, Paul M. Chaikin

Research output: Contribution to journal › Article › peer-review

Abstract

The self-diffusion constant of water droplets in a three-component, oil external microemulsion containing n-decane, water, and an anionic surfactant, sodium di-2-ethylhexylsulfosuccinate (AOT¹) was measured by forced Rayleigh scattering. The droplet radius was kept fixed by holding the weight ratio of surfactant to water fixed at 3:5 and the diffusion constant was measured as a function of the minor component (water + AOT) volume fraction. The diffusion constant was observed to decrease about a factor of 3 from 10-16% volume fraction of water + AOT. From 16 to 60% the diffusion constant was independent of the volume fraction of water + AOT. These results, together with previous neutron scattering measurements on this system, suggest that a bicontinuous phase is not formed. A possible explanation involving dynamically percolating clusters of water droplets is discussed.

Original language	English (US)
Pages (from-to)	545-550
Number of pages	6
Journal	Journal of Colloid And Interface Science
Volume	115
Issue number	2
DOIs	https://doi.org/10.1016/0021-9797(87)90073-7
State	Published - Feb 1987

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Biomaterials
Surfaces, Coatings and Films
Colloid and Surface Chemistry

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10.1016/0021-9797(87)90073-7

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title = "Self-diffusion in three-component, oil external microemulsions by forced Rayleigh scattering",

abstract = "The self-diffusion constant of water droplets in a three-component, oil external microemulsion containing n-decane, water, and an anionic surfactant, sodium di-2-ethylhexylsulfosuccinate (AOT1) was measured by forced Rayleigh scattering. The droplet radius was kept fixed by holding the weight ratio of surfactant to water fixed at 3:5 and the diffusion constant was measured as a function of the minor component (water + AOT) volume fraction. The diffusion constant was observed to decrease about a factor of 3 from 10-16% volume fraction of water + AOT. From 16 to 60% the diffusion constant was independent of the volume fraction of water + AOT. These results, together with previous neutron scattering measurements on this system, suggest that a bicontinuous phase is not formed. A possible explanation involving dynamically percolating clusters of water droplets is discussed.",

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AU - Dozier, William D.

AU - Kim, Mahn Won

AU - Chaikin, Paul M.

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Y1 - 1987/2

N2 - The self-diffusion constant of water droplets in a three-component, oil external microemulsion containing n-decane, water, and an anionic surfactant, sodium di-2-ethylhexylsulfosuccinate (AOT1) was measured by forced Rayleigh scattering. The droplet radius was kept fixed by holding the weight ratio of surfactant to water fixed at 3:5 and the diffusion constant was measured as a function of the minor component (water + AOT) volume fraction. The diffusion constant was observed to decrease about a factor of 3 from 10-16% volume fraction of water + AOT. From 16 to 60% the diffusion constant was independent of the volume fraction of water + AOT. These results, together with previous neutron scattering measurements on this system, suggest that a bicontinuous phase is not formed. A possible explanation involving dynamically percolating clusters of water droplets is discussed.

AB - The self-diffusion constant of water droplets in a three-component, oil external microemulsion containing n-decane, water, and an anionic surfactant, sodium di-2-ethylhexylsulfosuccinate (AOT1) was measured by forced Rayleigh scattering. The droplet radius was kept fixed by holding the weight ratio of surfactant to water fixed at 3:5 and the diffusion constant was measured as a function of the minor component (water + AOT) volume fraction. The diffusion constant was observed to decrease about a factor of 3 from 10-16% volume fraction of water + AOT. From 16 to 60% the diffusion constant was independent of the volume fraction of water + AOT. These results, together with previous neutron scattering measurements on this system, suggest that a bicontinuous phase is not formed. A possible explanation involving dynamically percolating clusters of water droplets is discussed.

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Self-diffusion in three-component, oil external microemulsions by forced Rayleigh scattering

Abstract

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