Fabrication and Operation of Acoustofluidic Devices Supporting Bulk Acoustic Standing Waves for Sheathless Focusing of Particles.

Journal Article

Acoustophoresis refers to the displacement of suspended objects in response to directional forces from sound energy. Given that the suspended objects must be smaller than the incident wavelength of sound and the width of the fluidic channels are typically tens to hundreds of micrometers across, acoustofluidic devices typically use ultrasonic waves generated from a piezoelectric transducer pulsating at high frequencies (in the megahertz range). At characteristic frequencies that depend on the geometry of the device, it is possible to induce the formation of standing waves that can focus particles along desired fluidic streamlines within a bulk flow. Here, we describe a method for the fabrication of acoustophoretic devices from common materials and clean room equipment. We show representative results for the focusing of particles with positive or negative acoustic contrast factors, which move towards the pressure nodes or antinodes of the standing waves, respectively. These devices offer enormous practical utility for precisely positioning large numbers of microscopic entities (e.g., cells) in stationary or flowing fluids for applications ranging from cytometry to assembly.

Full Text

Duke Authors

Cited Authors

  • Shields, CW; Cruz, DF; Ohiri, KA; Yellen, BB; Lopez, GP

Published Date

  • March 6, 2016

Published In

PubMed ID

  • 27022681

Pubmed Central ID

  • 27022681

Electronic International Standard Serial Number (EISSN)

  • 1940-087X

International Standard Serial Number (ISSN)

  • 1940-087X

Digital Object Identifier (DOI)

  • 10.3791/53861


  • eng