Dresden 2017 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 47: Fluids and Interfaces I

CPP 47.6: Talk

Wednesday, March 22, 2017, 17:45–18:00, ZEU 255

Solvent Extraction: Structure of the Liquid-Liquid Interface Containing a Diamide Ligand — •Ernesto Scoppola¹, Erik Watkins², Richard Campbell³, Oleg Konovalov⁴, Luc Girard⁵, Ignacio Rodriguez-Loureiro¹, Jean-François Dufrêche⁵, Geoffroy Ferru⁶, Giovanna Fragneto³, Emanuel Schneck¹, and Olivier Diat⁵ — ¹Max Planck Institut of Colloids and Interfaces, Potsdam, Germany — ²LANL, Los Alamos, USA — ³ILL, Grenoble, France — ⁴ESRF Grenoble, France — ⁵ICSM, Bagnols sur Cèze Cedex, France — ⁶ANL, Lemont, USA

Knowledge of the (supra)molecular structure of an interface that contains amphiphilic ligand molecules is necessary for a full understanding of ion transfer during solvent extraction. Even if molecular dynamics simulations already yield some insight in the molecular configurations in solution, hardly any experimental data giving access to distributions of both ligands and ions at the liquid*liquid interface exist. Here, the combined application of X-ray and neutron reflectometry represents a milestone in the deduction of the interfacial structure and potential with respect to different lipophilic ligands. It is also shown that neutron reflectometry can specifically reveal the ion distribution at the interface when neutron absorption and neutron-induced gamma-fluorescence are analyzed. To this end we show that hard trivalent cations can be repelled or attracted by the ligand-enriched interface depending on the nature of the ligand. References: 1.Scoppola E et al. (2016) Solvent Extraction: Structure of the Liquid-Liquid interface containing a Diamide ligand. Angewandte Chemie International Edition 55 (32), 9326.