Size disproportionation in vesicular dispersions

Norman W. Johnson; Eric W. Kaler

doi:10.1016/0021-9797(87)90140-8

Size disproportionation in vesicular dispersions

Norman W. Johnson, Eric W. Kaler

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Abstract

Vesicular dispersions of the synthetic surfactant sodium 4-(1′-heptylnonyl) benzenesulfonate (SHBS) formed by sonication change with time. Reported here are electrical conductivity and turbidity data that support the hypothesis that this dispersion ages by a process involving the diffusion of monomer from small vesicles to large ones that is akin to Ostwald ripening. Much of the change in the vesicle population immediately after sonication is due to the relaxation of a supersaturation of surfactant caused by sonication. The vesicles do not aggregate or fuse. In addition, the solubility of pure SHBS in water at 25°C is found to be 0.22 wt%, a value three times higher than that previously reported.

Original language	English (US)
Pages (from-to)	444-457
Number of pages	14
Journal	Journal of Colloid And Interface Science
Volume	116
Issue number	2
DOIs	https://doi.org/10.1016/0021-9797(87)90140-8
State	Published - Apr 1987

Bibliographical note

Funding Information:
Companies Foundation, by the National Science Foundation (Grant CBT-8351179), and by the Standard Oil Company (Ohio) with matching funds under the National Science Foundation's Presidential Young Investigator Program.

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title = "Size disproportionation in vesicular dispersions",

abstract = "Vesicular dispersions of the synthetic surfactant sodium 4-(1′-heptylnonyl) benzenesulfonate (SHBS) formed by sonication change with time. Reported here are electrical conductivity and turbidity data that support the hypothesis that this dispersion ages by a process involving the diffusion of monomer from small vesicles to large ones that is akin to Ostwald ripening. Much of the change in the vesicle population immediately after sonication is due to the relaxation of a supersaturation of surfactant caused by sonication. The vesicles do not aggregate or fuse. In addition, the solubility of pure SHBS in water at 25°C is found to be 0.22 wt%, a value three times higher than that previously reported.",

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AU - Kaler, Eric W.

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N2 - Vesicular dispersions of the synthetic surfactant sodium 4-(1′-heptylnonyl) benzenesulfonate (SHBS) formed by sonication change with time. Reported here are electrical conductivity and turbidity data that support the hypothesis that this dispersion ages by a process involving the diffusion of monomer from small vesicles to large ones that is akin to Ostwald ripening. Much of the change in the vesicle population immediately after sonication is due to the relaxation of a supersaturation of surfactant caused by sonication. The vesicles do not aggregate or fuse. In addition, the solubility of pure SHBS in water at 25°C is found to be 0.22 wt%, a value three times higher than that previously reported.

AB - Vesicular dispersions of the synthetic surfactant sodium 4-(1′-heptylnonyl) benzenesulfonate (SHBS) formed by sonication change with time. Reported here are electrical conductivity and turbidity data that support the hypothesis that this dispersion ages by a process involving the diffusion of monomer from small vesicles to large ones that is akin to Ostwald ripening. Much of the change in the vesicle population immediately after sonication is due to the relaxation of a supersaturation of surfactant caused by sonication. The vesicles do not aggregate or fuse. In addition, the solubility of pure SHBS in water at 25°C is found to be 0.22 wt%, a value three times higher than that previously reported.

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Size disproportionation in vesicular dispersions

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