8th Liquid Matter Conference September 6-10, 2011 Wien, Austria ...

P7.86Thu 811:10-14:00Interactions between like-charged plates in the presenceof electrolytesAnna Oleksy 1 and Roland Kjellander 11 University of Gothenburg, Department of Chemistry, SE-412 96, Göteborg, SwedenUnderstanding electrostatic interactions between charged particles in presence of electrolytes iscrucial for the comprehension of countless phenomena encountered by researchers working inthe fields of surface and colloid physics, biosciences and nanophysics. The study presented hereis a theoretical analysis of forces acting between two like-charged plates immersed in aqueoussolutions of common ionic salts. The system considered is composed of two or three ionic species(a mixture of size-asymmetric charged hard spheres) and two charged hard walls. The solvent’sinfluence is accounted for implicitly. Ornstein-Zernike integral equation with a reference HNCclosure is solved to gain insight into the behaviour of the system. This method allows to accountfor ion-ion correlations, which are immensely relevant in solutions containing multivalent ionsand/or placed in contact with highly charged substrates. The bridge function in the rHNC closureis derived from a Fundamental Measure Theory density functional for a hard sphere fluid, whichprovides for very accurate treatment of the hard core repulsions between the ionic species.86