(15a) Particles in Contact: The Key Challenge in Solids Processing
The (nano-)mechanics of particles across all length scales down to the nanoscale are highly relevant for many applications including adhesion, friction, powder flow, comminution and tribology. Particular interesting new fields are additive manufacturing and 3D printing which âpromiseâ a revolution in industrial manufacturing based on powder technologies. Nanomechanical elastic and inelastic particle properties have been measured systematically in a novel nanoindentation device installed within a scanning electron microscope to obtain simultaneously force-displacement information and optical images of deformed and broken particles. Quantitative data of intrinsic particle properties (and their respective distributions) are derived with high statistical relevance from force-displacement curves of single oxide, metal and polymer particles. The force-displacement of well-defined model particles can be used to obtain so far unknown distributions of stress energy and stress number distributions in mills and other solids processing devices. Finally, we show how novel 2D materials such as graphene, MoS2 or BN can be produced by scalable mechanical delamination. Here, the challenge is also to characterize the delaminated nanosheets which is accomplished by advanced ultracentrifugation techniques. All these results are discussed in the context of unifying principles of product design and solids processing.