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Accueil du site > Productions scientifiques > Séminaires à PHENIX > 2012 > Séminaire 30.10.2012 à 14h00

Séminaire 30.10.2012 à 14h00

par Benjamin Rotenberg - 5 octobre 2012

Alexei A. Kornyshev (Imperial College London), présentera un séminaire le 30 octobre 2012 à 14h00 dans la bibliothèque du laboratoire PECSA (7e étage, bâtiment F, porte 754) intitulé :

Plasma in a bottle, and the physics of supercapacitors and electroactuators at the nanoscale

Résumé

Plasma in a bottle ? This is a reality nowadays, with the recent explosion of research in strongly correlation coulomb systems – room temperature ionic liquids (RTILs) – ‘the so called ‘solvent-free electrolytes’. Practically unlimited number of these non-volatile smart substances can be synthesised in laboratory and mixed to optimize the target applications, ranging from energy generation and storage (batteries, solar cells, fuel cells, and supercapacitors) to electroactuators and lubricants, from extraction of metals to catalysis, from cosmetic industry to gating in molecular electronics. A large class of applications is related with their structure and properties at electrified interfaces, including nano-templated electrodes. This lecture will overview the current status of understanding of the electrical double layer in RTILs near electrodes surfaces as a function of voltage, as well as of various devices based on it. Existing theories and computer simulations will be confronted with reported experimental observations.

The presentation will cover :
- Results for flat electrodes
- Results for more ‘realistic’ electrodes, including nano-templated electrodes
- The link between the structure and dielectric response of the double layer and the properties of nanotemplated supercapacitors and electroactuators.

The presentation will focus on the predictions of the theory that can be experimentally verified and those that have been verified already. The revealed dependencies will be analyzed in the context of the optimization of performance of these devices, under the slogan : what is the best structure for the best performance ? These will include such issues as the optimal pore size of nanotemplated electrodes for the maximal energy storage and power delivery, maximal bending of an electroactuator and the fastest time response - for a given voltage.

Overview-like in character the talk will compare approaches of different groups, being, however, centred around original results based on the internal and cooperation projects of the presenter’s group at Imperial (including, in the first place, Slava Kondrat and Alpha Lee) and the groups of Yuri Gogotsi (Drexel University), Ralf Colby (PennState), Martin Bazant (MIT), and Maxim Fedorov (University of Strathclyde).

Téléchargez l’annonce ici

The speaker

Professor Kornyshev, by background a theoretical physicist, is renowned for his works at the interface of physics, chemistry and biology. His Masters degree was in Theoretical Nuclear Physics (1970, MIFI), PhD in Theoretical and Mathematical Physics (1974, Acad. Sci. USSR), and DSc in Physical Chemistry and Electrochemistry (1986). His career started in 1974 at the Frumkin Institute in Moscow, were he worked for 19 years. Then, for 10 years he was leading a theory division in one of the Institutes of Research Centre “Jülich”, Germany, later combined with Professorship of Theoretical Physics at the University of Duesseldorf. Since 2002 he holds a Chair of Chemical Physics at Imperial College London.

He is known specifically for his pioneering and seminal works in the theory of electrochemical interfaces, solvation, hydration forces, electron and proton transfer in solutions and in complex environment (from membranes to nanodevices and single molecules), and modern fuel cells. His very recent work has lead to a paradigm change in understanding of the features of electrical double layer in ionic liquids, the area important for supercapacitors. Another hot area of his studies has opened new directions in self-assembled ultra-low voltage electrovariable optics, important for electrotuneable lenses, mirrors, windows, optical filters, switches and ultrasensitive nanoplasmonic sensors. Since 2007 one of his main research areas has been the theory of interactions of helical biomolecules in solution. As a result, together with S. Leikin (NIH) he has laid foundations of the theory of DNA-DNA interactions and DNA aggregation. This work led them to a prediction in 2001 of a protein-free, electrostatic mechanism of recognition of homologous genes from a distance without unzipping prior homologous recombination, the existence of which was approved experimentally in 2008 by Imperial/NIH team and in 2009 by a consortium of researchers at Harvard University.

Through his career, Alexei Kornyshev has been cooperating with many researchers worldwide, currently — with several groups in the USA, Germany, Israel, Denmark, France, and Holland.

He was a recipient of prestigious awards (1991 Humboldt Prize in Physical Chemistry and Electrochemistry, 2003 Royal Society Wolfson Merit Research Award), 2006 RSC Geoffrey Barker Electrochemistry Medal ; 2003 EFCF C.-F.Schönbein Contribution-to-Science medal. He is an elected Fellow of the Institute of Physics, of IUPAC, and of ISE, and Foreign Member of Royal Danish Academy of Science.

He is also known for his synergetic activities : he organized and directed many conferences devoted to ‘intervention’ of physics into chemistry and biology, and vice versa (c.f. just five such conferences at the International Centre for Theoretical Physics, Trieste, the last one - “From DNA inspired Physics to Physics Inspired Biology”). A series of books and special issues that he had edited, and his own chapters in books and encyclopaedias where all across the borders of classical disciplines. His 200 original papers in refereed journals and 25 monographic articles where published in chemical, physical, or biophysical journals. His papers devoted to hot topics of physical chemistry and biochemistry where often published in high profile physical journals, increasing the impact of chemistry in the physical community. He is on Editorial Boards of J. Physics : Condensed Matter (IOP) and Scientific Reports (Nature Pbls).

http://www3.imperial.ac.uk/people/a...