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Accueil du site > Productions scientifiques > Séminaires à PHENIX > 2013 > Séminaire 05.02.2013 à 14h

Séminaire 05.02.2013 à 14h

par Benjamin Rotenberg - 22 janvier 2013

Tobias Kraus, du Leibniz-Institute for New Materials de Saarbrücken (Allemagne), présentera un séminaire le 5 février 2013 à 14h00 dans la bibliothèque du laboratoire PECSA (7e étage, bâtiment F, porte 754) intitulé :

Particle films, clusters and supercrystals : science and process engineering of nanoparticle self-assembly

Télécharger l’annonce (pdf, 200ko)

Résumé

Nanoscale particles are components in many commercial materials. They lend their properties to particle-polymer hybrids, form dense networks in sol-gel coatings and sinter into flexible functional layers at moderate temperatures. The particles in such materials are generally polydispersed and randomly distributed. We are interested in controlling the particles’ shapes and arrangement both to improve material properties and to introduce new types of behavior. Various mechanisms can arrange the particles. Here, I will talk about processes that either depend on free energy minimization or operate far from equilibrium and discuss their applicability for material synthesis. The prerequisites in terms of particle and matrix properties and attainable structures will be highlighted. To achieve control over particle arrangements, we exploit templating by emulsion droplets, hydrodynamic coupling in liquid films and tuneable short-ranged interactions. Each of these methods has their own prerequisites, but mobility and interaction have to be balanced in all of them to achieve a controllable, predictable particle superstructure. Our technological goal is to derive robust techniques for material synthesis from these principles. I will present attempts to combine particle assembly with standard techniques such as dip-coating, printing, emulsion processing and polymer formulation.

CV court

Tobias Kraus studied Chemical Engineering at the Technical University in Munich, with detours to MIT in Boston and Neuchâtel in Switzerland. He then stayed in Switzerland to pursue a PhD under Prof. Nicholas D. Spencer at ETH Zurich’s Department of Materials. His goal was to arrange and print various objects (including, but not limited to, nano) in close collaboration with IBM’s Zurich Research Laboratory. Tobias remained at IBM for a brief PostDoc and then accepted a position at the Leibniz-Institute for New Materials in Saarbrücken, Germany, where he now heads a Junior Research Group that synthesizes, assembles and analyzes nanoparticles.