Collaborator : Gabriel Dumy (PhD student between 2016 – 2019)
If spherical particles can be gathered in the Acoustic Levitation plane where they can ultimately be trapped to form stable aggregates, this is no longer the case for non-spherical particles. When dealing with metellic nanorods, one can observe a very different behavior : the nanorods are self-propelled, i.e. instead of gathering to form a stable aggregate, the rods move randomly into the levitation plane. This phenomenon is called « self-acoustophoresis ».
When the metallic nanorods are subjected to the ARF and reach the acoustic levitation plane, they start moving randomly. A typical example is shown below for gol nanorods. One can see the various trajectories measured in the levitation plane.