Institute of Solid State Physics

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Charging of neutral solutes in water
Douwe Jan Bonthuis
11:15 - 12:15 Wednesday 23 October 2019 PH 01 150

Owing to the small length scales involved, aqueous interfaces dominate the properties of colloidal materials suspended in water. Surface charges, in particular, control the stability of colloidal suspensions and the self-assembly and organisation of nanoparticles. Apart from charging by surface groups, ions and protons adsorb at the surfaces of colloids, lipid membranes and biological molecules, affecting their electrostatic and hydrodynamic interactions.

We study the interfacial structure of the aqueous interfaces of oil droplets, air bubbles and solid surfaces. A combination of analytical work, molecular dynamics simulations and continuum theory allows for direct comparison to experimental results for surface tensions, conductivities and electrokinetic mobilities.