title: Measuring acoustic energy density in microchannel acoustophoresis using a simple and rapid light-intensity method.
abstract: We present a simple and rapid method for measuring the acoustic energy density in microchannel acoustophoresis based on light-intensity measurements of a suspension of particles. The method relies on the assumption that each particle in the suspension undergoes single-particle acoustophoresis. It is validated by the single-particle tracking method, and we show by proper re-scaling that the re-scaled light intensity plotted versus re-scaled time falls on a universal curve. The method allows for analysis of moderate-resolution images in the concentration range encountered in typical experiments, and it is an attractive alternative to particle tracking and particle image velocimetry for quantifying acoustophoretic performance in microchannels.
authors.affiliation: Department of Micro- and Nanotechnology, Technical University of Denmark, Kongens Lyngby, Denmark. barnkob@alumni.dtu.dk
authors.forename: Rune
authors.initials: R
authors.lastname: Barnkob
authors.forename: Ida
authors.initials: I
authors.lastname: Iranmanesh
authors.forename: Martin
authors.initials: M
authors.lastname: Wiklund
authors.forename: Henrik
authors.initials: H
authors.lastname: Bruus
mesh_terms: D000162:Acoustics; D008027:Light; D046210:Microfluidic Analytical Techniques / Q000295:instrumentation / Q000379:methods*; D012212:Rheology; D013535:Suspensions / Q000737:chemistry; D013696:Temperature
chemical_list: D013535:Suspensions