Acoustophoresis of hollow and core-shell particles in two-dimensional resonance modes

Open access
Author
Show all
Date
2014-03Type
- Journal Article
Citations
Cited 23 times in
Web of Science
Cited 22 times in
Scopus
ETH Bibliography
yes
Altmetrics
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. Show more
Permanent link
https://doi.org/10.3929/ethz-b-000077484Publication status
publishedExternal links
Journal / series
Microfluidics and NanofluidicsVolume
Pages / Article No.
Publisher
SpringerSubject
Acoustophoresis; Acoustofluidics; Ultrasonic particle manipulation; Core-shell particles; Gor’kov potentialOrganisational unit
03307 - Dual, Jürg (emeritus) / Dual, Jürg (emeritus)
02618 - Institut für Mechanische Systeme / Institute of Mechanical Systems
Notes
It was possible to publish this article open access thanks to a Swiss National Licence with the publisher.More
Show all metadata
Citations
Cited 23 times in
Web of Science
Cited 22 times in
Scopus
ETH Bibliography
yes
Altmetrics