Colloid-oil-water-interface interactions in the presence of multiple salts: Charge regulation and dynamics

J. C. Everts; S. Samin; N. A. Elbers; J. E.S. Van Der Hoeven; A. Van Blaaderen; R. Van Roij

doi:10.1039/c7cp01935a

Colloid-oil-water-interface interactions in the presence of multiple salts: Charge regulation and dynamics

J. C. Everts, S. Samin, N. A. Elbers, J. E.S. Van Der Hoeven, A. Van Blaaderen, R. Van Roij

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

7 Scopus citations

Abstract

We theoretically and experimentally investigate colloid-oil-water-interface interactions of charged, sterically stabilized, poly(methyl-methacrylate) colloidal particles dispersed in a low-polar oil (dielectric constant ε = 5-10) that is in contact with an adjacent water phase. In this model system, the colloidal particles cannot penetrate the oil-water interface due to repulsive van der Waals forces with the interface whereas the multiple salts that are dissolved in the oil are free to partition into the water phase. The sign and magnitude of the Donnan potential and/or the particle charge is affected by these salt concentrations such that the effective interaction potential can be highly tuned. Both the equilibrium effective colloid-interface interactions and the ion dynamics are explored within a Poisson-Nernst-Planck theory, and compared to experimental observations.

Original language	English
Pages (from-to)	14345-14357
Number of pages	13
Journal	Physical Chemistry Chemical Physics
Volume	19
Issue number	22
DOIs	https://doi.org/10.1039/c7cp01935a
State	Published - 1 Jan 2017
Externally published	Yes

ASJC Scopus subject areas

General Physics and Astronomy
Physical and Theoretical Chemistry

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10.1039/c7cp01935a

Cite this

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title = "Colloid-oil-water-interface interactions in the presence of multiple salts: Charge regulation and dynamics",

abstract = "We theoretically and experimentally investigate colloid-oil-water-interface interactions of charged, sterically stabilized, poly(methyl-methacrylate) colloidal particles dispersed in a low-polar oil (dielectric constant ε = 5-10) that is in contact with an adjacent water phase. In this model system, the colloidal particles cannot penetrate the oil-water interface due to repulsive van der Waals forces with the interface whereas the multiple salts that are dissolved in the oil are free to partition into the water phase. The sign and magnitude of the Donnan potential and/or the particle charge is affected by these salt concentrations such that the effective interaction potential can be highly tuned. Both the equilibrium effective colloid-interface interactions and the ion dynamics are explored within a Poisson-Nernst-Planck theory, and compared to experimental observations.",

author = "Everts, {J. C.} and S. Samin and Elbers, {N. A.} and {Van Der Hoeven}, {J. E.S.} and {Van Blaaderen}, A. and {Van Roij}, R.",

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T2 - Charge regulation and dynamics

AU - Everts, J. C.

AU - Samin, S.

AU - Elbers, N. A.

AU - Van Der Hoeven, J. E.S.

AU - Van Blaaderen, A.

AU - Van Roij, R.

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AB - We theoretically and experimentally investigate colloid-oil-water-interface interactions of charged, sterically stabilized, poly(methyl-methacrylate) colloidal particles dispersed in a low-polar oil (dielectric constant ε = 5-10) that is in contact with an adjacent water phase. In this model system, the colloidal particles cannot penetrate the oil-water interface due to repulsive van der Waals forces with the interface whereas the multiple salts that are dissolved in the oil are free to partition into the water phase. The sign and magnitude of the Donnan potential and/or the particle charge is affected by these salt concentrations such that the effective interaction potential can be highly tuned. Both the equilibrium effective colloid-interface interactions and the ion dynamics are explored within a Poisson-Nernst-Planck theory, and compared to experimental observations.

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Colloid-oil-water-interface interactions in the presence of multiple salts: Charge regulation and dynamics

Abstract

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