Abstract
Motivated by the applications of ultrasonic particle manipulation in a biotechnological context, a study on acoustophoresis of hollow and core-shell particles is presented with analytical derivations, numerical simulations and confirming experiments. For a long-wavelength calculation of the acoustic radiation forces, the Gor’kov potential of hollow, air-filled particles and particles with solid or fluid core and shell is derived. The validity as well as the applicable range of the long-wavelength calculation is evaluated with numerical simulations in Comsol Multiphysics®. The results are experimentally verified in the acoustic field of an intrinsically two-dimensional fluid resonance mode, which allows for a more complex analysis than the common one-dimensional ultrasonic standing waves or their superposition to two-dimensional fields. Experiments were conducted with hollow glass particles (13.9 μm diameter) in a microfluidic chamber of 1.2 mm × 1.2 mm × 0.2 mm on a silicon-based device with piezoelectric excitation around 870 kHz. The described resonance mode is of additional interest for particle trapping and medium exchange on certain particle types, and it reveals a novel approach for particle characterization or separation.
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The authors would like to express their gratitude for funding by ETH Zurich and the Swiss National Science Foundation, SNF No. 200021_126986.
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Leibacher, I., Dietze, W., Hahn, P. et al. Acoustophoresis of hollow and core-shell particles in two-dimensional resonance modes. Microfluid Nanofluid 16, 513–524 (2014). https://doi.org/10.1007/s10404-013-1240-7
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DOI: https://doi.org/10.1007/s10404-013-1240-7