Dr Jeffrey Everts: Non-touching charged colloidal particles near an oil-water interface

Datum objave: 12. 10. 2016
Seminar fizike mehkih snovi
Četrtek, 13. oktober 2016 ob 13:00, Kuščerjev seminar, Jadranska 19, FMF UL

Non-touching charged colloidal particles near an oil-water interface

Dr Jeffrey Everts: Utrecht Unviersity, Netherlands

In this talk I will give a brief overview on the physics of charged colloidal particles with double layers larger than the particle size. In particular, I will show that the interaction of an oil-dispersed colloidal particle with an oil-water interface is highly tunable from attractive to repulsive, either by varying the sign of the colloidal charge via charge regulation, or by varying the difference in hydrophilicity between the dissolved cations and anions. In addition, we investigate the yet unexplored interplay between the self-regulated colloidal surface charge distribution with the planar double layer across the oil-water interface and the spherical one around the colloid. We explain recent experiments where so-called "non-touching" oil-dispersed colloids were detached from an oil-water interface by the addition of an organic salt to the oil, while the particles were initially being trapped at a finite, but small distance from the interface


Kindly invited!