Highly dispersible nanoparticles as easy-to-handle powders
Nanotechnology can already be used today to generate a broad spectrum of functionalities on a laboratory scale. The “Nanoparticle Kitchen” of the Fraunhofer ISC takes the next step towards complex property profiles of particles and higher production quantities using industrial processes. For example, the wet-chemical production of nanoparticles with reproducible properties is combined with industrial drying processes.
Using wet chemistry methods, it is possible to produce a large number of different nanoparticle types. When these particles are dried, mechanically stable aggregates are formed whose size, structure, mechanical properties and strength determine the application properties. Experience has shown that redispersing the resulting aggregates to primary particle size in a suitable matrix is not possible, or only at great expense.
Through a targeted modification of nanoparticles in dispersion, the properties of the microparticle powder resulting from the drying process can be controlled and thus pre-programmed. Depending on the degree of modification, the particles can be arranged either in mechanically stable aggregates or loose agglomerates that can be dispersed again at the nano level in a suitable matrix. With this system the advantages of powders (easy handling) and nanoparticle dispersions (isolated particles) can be combined in one product. As an example, the improvement of mechanical properties in car tires through the addition of particle-based fillers with controlled dispersion behavior could be demonstrated in the completed “BISYKA” project.
Powder with adjustable redispersibility in nanometer scale. Nanostructured microparticle powders with adjustable dispersion behavior and matrix-adapted properties.