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We conducted micro-gravity experiments to study the outcome of collisionsbetween sub-mm-sized dust agglomerates consisting of \mu m-sized SiO2 monomergrains at velocities of several cm/s. Prior to the experiments, we used X-raycomputer tomography (nano-CT) imaging to study the internal structure of thesedust agglomerates and found no rim compaction so that their collision behavioris not governed by preparation-caused artefacts. We found that collisionsbetween these dust aggregates can lead either to sticking or to bouncing,depending mostly on the impact velocity. While previous collision modelsderived the transition between both regimes from contact physics, we used theavailable empirical data from these and earlier experiments to derive a powerlaw relation between dust-aggregate mass and impact velocity for the thresholdbetween the two collision outcomes. In agreement with earlier experiments, weshow that the transition between both regimes is not sharp, but follows ashallower power law than predicted by previous models (G\"uttler et al. 2010).Furthermore, we find that sticking between dust aggregates can lead to theformation of larger structures. Collisions between aggregates-of-aggregates canlead to growth at higher velocities than homogeneous dust agglomerates.

Free Collisions in a Microgravity Many-Particle Experiment III: The Collision Behavior of sub-Millimeter-Sized Dust Aggregates