Journal
ULTRASONICS SONOCHEMISTRY
Volume 57, Issue -, Pages 193-202Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.ultsonch.2019.05.010
Keywords
Acoustic Tweezers; 2D microparticle Array; Acoustic Trap; Acoustic Lens; Acoustofluidics; Dictyostelium discoideum (Amoebae)
Categories
Funding
- University of Connecticut Provosts fund (USA)
- NSF Nano-Bio-Mechanics (USA) [0626231]
- Lancaster University
- EPSRC (UK) [EP/K023373/1]
- Div Of Civil, Mechanical, & Manufact Inn
- Directorate For Engineering [0626231] Funding Source: National Science Foundation
- EPSRC [EP/K023373/1] Funding Source: UKRI
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Acoustic tweezers facilitate the manipulation of objects using sound waves. With the current state of the technology one can only control mobility for a single or few microparticles. This article presents a state of the art system where an Acoustic Lens was used for developing a Micro-Acoustic Trap for microparticle assembly in 3D. The model particles, 2 mu m diameter polystyrene beads in suspension, were driven via acoustic pressure to form a monolayer at wavelength-defined distances above the substrate defined by the focal point of an Acoustic Lens The transducer was driven at 89 MHz, mixed with 100 ms pulses at a repetition rate of 2 Hz. Beyond a threshold drive amplitude sufficient to overcome Brownian motion, this led to 2D assembly of the microparticles into close-packed rafts > 80 mu m across (similar to 5 wavelengths of the carrier wave and > 40 particles across). This methodology was further extended to manipulation of live Dictyostelium discoideum amoebae. This approach therefore offers maneuverability in controlling or assembling micrometer-scale objects using continuous or pulsed focused acoustic radiation pressure.
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