Dresden 2014 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 44: Charged Soft Matter I

CPP 44.4: Vortrag

Donnerstag, 3. April 2014, 10:15–10:30, ZEU 118

Structure of electrolyte solutions in complex solvents — •Markus Bier — Max Planck Institute IS und University of Stuttgart, Germany

Since recently quite some theoretical as well as experimental effort is devoted to investigate structural properties of electrolyte solutions in which the solvent cannot be considered as a structureless medium. The most prominent example are solvents formed by binary liquid mixtures whose components interact differently with the ions. Consequently the presence of ions can influence the phase diagram of the solvent, e.g. the location of the miscibility gap. Conversely, a solvent mixture close to its critical demixing point can perturb the structure of the ions.
This contribution discusses the changes of the structure of electrolyte solutions in binary liquid mixture solvents as one approaches the critical demixing point [1,2]. It is explained how the partial pair distribution functions evolve upon approaching the critical point of the mixture from a monotonic decay on the length scale of the Debye length via an oscillatory decay, reached by Kirkwood crossovers, towards a monotonic decay on the length scale of the bulk correlation length. This scenario is a key to understand recent experimental findings related to the structure of electrolyte solutions in complex solvents.
References:
[1] M. Bier, A. Gambassi and S. Dietrich, J. Chem. Phys. 137, 034504
[1] (2012).
[2] M. Bier and L. Harnau, Z. Phys. Chem. 226, 807 (2012).