Bernal Institute Research Forum

Date: 28th February 2018 to 28th February 2018
Time: 12:00 to 13:00
Duration: One hour
Location: MSG-025 MSSI Building Extension

Dr Jane Stockmann, Paris Diderot University, Paris, France.

Electrochemistry at Liquid|liquid Interfaces for Analytical Applications (Or Weird Electrochemistry …)

Since Nernst and Riesenfeld (1) first performed their experiments more than 100 years ago, the immiscible interface between two electrolytic solutions (ITIES), or so-called soft interfaces, have been of considerable interest, mainly owing to their biomimetic nature. Simple ion transfer is achieved by biasing electrodes immersed in either phase – pushing and pulling ions across interface. Expanding upon this concept, liqud|liquid electrochemistry has become a valuable analytical platform for biomolecule detection, (2,3) metal ion extraction, (4-6) as well as for nanoparticle investigations (7) – e.g. catalytic nanofilms.(8,9) The aim of this talk is to emphasize the analytical utility of soft interfacial electrochemistry. First through two facilitated ion transfer examples: e.g. (i) proton interactions with fully solvated phospholipids for vesicle encapsulated processes; (ii) metal ion-ligand interactions for spent nuclear fuel reclamation using hydrophobic ionic liquids. Finally through stochastic nanoparticle impacts at a water|oil micro-interface, detected via exploiting the catalytic enhancement of O2 reduction by the Pt nanoparticles, will be showcased. Liquid|liquid electrochemistry is a proven, valuable technique for a range of analytical applications, including environmental and (bio)sensors, with the introduction of nanoparticles this has only expanded its possibilities. Difficult questions remain and this platform may be the key to unlocking those answers.

(1) Nernst, W.; et al. Ann. der Physik 1902, 8, 600-608. (2) Arrigan, D. W. M.; et al. Annu. Rev. Anal. Chem. 2016, 9, 145-161. (3) Stockmann, T. J.; et al., F. J. Phys. Chem. C 2016, 120, 11977–11983. (4) Stockmann, T. J.; et al. Catal. Today 2017, 295, 89-94. (5) Stockmann, T. J.; et al. Anal. Chim. Acta 2014, 821, 41-47. (6) Stockmann, T. J.; et al. Chem. Eur. J. 2011, 17, 13206-13216. (7) Stockmann, T. J. et al. Angew. Chem. Int. Ed. 2017, 56, 13493-13497. (8) Scanlon, M. D.; et al. Chem. Rev. 2017, In press. (9) Montelongo, Y.; et al. Nat. Mater. 2017, 16, 1127-1135.

Jane obtained her PhD in 2013 at the University of Western Ontario and won the Queen Elizabeth II Graduate Scholarship for her work on biphasic (water|ionic liquid) electrochemical spent nuclear sensing/recycling. She then moved to Lausanne Switzerland (2013-2014) to the group of Professor Hubert Girault performing numerical kinetic analysis of solar fuel production at liquid|liquid interfaces. Since 2014 she has been in the group of Drs. Frédéric Kanoufi and Catherine Combellas working on 3 main projects: (i) kinetic and mechanistic analysis of oscillating reactions through confinement using SECM as well as phospholipid interactions; (2) evaluation of biosensing methodologies using changes in surface reflectivity; and finally (3) the development of soft/flexible electrode materials from nanoparticle/ionic liquid composites. The latter has been sponsored by a Marie Skłodowska-Curie Action (MSCA) fellowship.

Tea/coffee will be available at 11h45.

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