Acoustic Particle Focusing in Polymer Microfluidic Devices

An acoustofluidic device, consisting of a polymer chip with a long straight channel, coupled to a piezoelectric transducer is modeled numerically in three dimensions and compared to experimental results in terms of the electric admittance as well as the ability to focus particles. In our experiments we obtain good acoustic particle focusing at a frequency of f = 1.14 MHz with an actuation voltage of 30 Vpp, deviating by only 2.6% from the predicted resonance frequency of our numerical model.