Institut des
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Accueil > Evénements > Séminaires > Archives 2015 > Agglomerating particles
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Séminaire de l’équipe « Physico-chimie et dynamique des surfaces »

Agglomerating particles into new materials - Tobias Kraus - Vendredi 17 juillet 2015 à 15 h

INSP - 4 place Jussieu - 75252 PARIS Cedex 05 - Barre 12-22 - 4e étage, salle 426

Tobias Kraus, Structure Formation Group, INM – Leibniz Institute for New Materials, Saarbrücken, Germany

Abstract

Hybrid functional materials derive their properties from the relative arrangement of their organic and inorganic components. They can be processed at moderate temperatures and are suitable for large‐area coating, roll‐to‐roll production, and (3D) printing. Our institute develops nanocomposites for tribology, optics, corrosion protection, adhesion management, energy storage and flexible electronics, amongst others. My group uses bottom‐up strategies to structure hybrid materials at will. We chemically synthesize nanoparticles with inorganic cores and organic shells in different geometries. The particles are then combined hierarchically until a macroscopic material is obtained. I will discuss the example of flexible transparent materials (TCM) to show how a combination of particle synthesis, self‐assembly, and post‐processing yields a functional material with a defined structure. Our approach requires control over particle agglomeration and particle surface chemistry. I will discuss fundamental results on nanoparticle agglomeration and highlight cluster formation in mixtures of macromolecules and nanoparticles. We also study the effect of confined volumes on agglomeration. Emulsions with nanoparticles in the dispersed phase are evaporated to create regular supraparticles. Mobility and interactions govern the structure of the resulting objects, I will discuss their formation mechanisms. Active nanocomposites contain particles that can rearrange. I will discuss how the mobility of particles in solid materials can be quantified and tuned, and how responsive materials can become possible in the future.