Issue 45, 2016

Polyelectrolytes adsorbed at water–water interfaces

Abstract

Polyelectrolytes can show strong adsorption at water–water interfaces formed by phase separation of two polymers in aqueous solution. We demonstrate this for a model system consisting of neutral polymer A and weakly positively charged polymer B. When polyelectrolyte is added with similar chemical composition as polymer A, but charge of opposite sign as polymer B, interfacial accumulation is observed. We hypothesize this accumulation to be complexation at the water–water interface. This adsorption surprisingly persists even at high salt concentrations and has only a limited effect on the interfacial tension. Complexation of polyelectrolytes at water–water interfaces may provide a new path towards the stabilization of water-in-water emulsions.

Graphical abstract: Polyelectrolytes adsorbed at water–water interfaces

Article information

Article type
Paper
Submitted
04 Okt. 2016
Accepted
31 Okt. 2016
First published
31 Okt. 2016

Phys. Chem. Chem. Phys., 2016,18, 30931-30939

Polyelectrolytes adsorbed at water–water interfaces

R. H. Tromp, R. Tuinier and M. Vis, Phys. Chem. Chem. Phys., 2016, 18, 30931 DOI: 10.1039/C6CP06789A

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