Particle-size-dependent acoustophoretic motion and depletion of micro- and nanoparticles at long time scales

24 Jul 2020 Qiu Wei Bruus Henrik Augustsson Per

We present three-dimensional measurements of size-dependent acoustophoretic motion of microparticles with diameters from 4.8 um down to 0.5 um suspended in either homogeneous or inhomogeneous fluids inside a glass-silicon microchannel and exposed to a standing ultrasound wave. To study the cross-over from radiation force dominated to streaming dominated motion as the particle size is decreased, we extend previous studies to long time scales, where the particles smaller than the cross-over size move over distances comparable to the channel width... (read more)

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