Figure 4

(a) Mapping showing the different collection states of particles at different actuation amplitudes (\(V_0\)) and translation speeds (\(v_t\)): stable collection between \(\lambda /4\) and \(\lambda /2\) (blue squares), unstable collection at \(\lambda /4\) (black crosses) and dispersion (red circles). The dashed black line indicates the maximum tweezing speed estimates. (b) Collection times for glass particles (\(r_p=\)5 \(\upmu \hbox {m}\)) at different actuation amplitudes and liquid heights \(h_l=\)0.5, 0.75 and 1 \(\hbox {mm}\).