Particles at the Gor'kov potential minimum that are larger in radius than r c (Eq. 7) remain there due to the Acoustic Radiation Force. However, if the particle radius is close to or below r c as it is the case for E. coli, streaming effects need to be considered. The streaming velocity plot reveals that particles are also dragged towards the thin wall by acoustic streaming with two counter-rotating vortices forming close to the silicon wall. Both vortices meet at the position of minimal Gor'kov potential. Therefore, even when the particles reach the point of minimal Gor'kov potential and thus are no longer subjected to the acoustic radiation force, they will still be trapped in the acoustic streaming vortices nearby the thin wall.