Figure 2.

Trajectories of RBCs due to a combination of the primary and the secondary acoustic forces. (a) Three different experiments with the silica particle fixed at a vertical distance of 20 µm from the pressure nodal line, the latter set to y = 0. In the A, B, and C cases, the cells were trapped at the silica particle and stacked. Note that the shortest distance between the positions of the cells and the boundary of the fixed particle corresponds to the radius of the RBCs. (b) Two different experiments with the silica particle fixed at a vertical distance of 65 µm from the pressure nodal line. In both cases, cells D and E were separated from the fixed silica particle following a smooth contact.