Issue 22, 2017

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.

Graphical abstract: Colloid–oil–water-interface interactions in the presence of multiple salts: charge regulation and dynamics

Supplementary files

Article information

Article type
Paper
Submitted
27 Mar 2017
Accepted
17 May 2017
First published
18 May 2017

Phys. Chem. Chem. Phys., 2017,19, 14345-14357

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 and R. van Roij, Phys. Chem. Chem. Phys., 2017, 19, 14345 DOI: 10.1039/C7CP01935A

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.

Social activity

Spotlight

Advertisements