Abstract
We report the extraction, capture, and manipulation of a droplet from a liquid-liquid surface using the acoustic near field from a fraxicon lens transducer. The lens is submerged in water, which shares a planar boundary with a reservoir of carbon tetrachloride (). The ultrasonic beam exerts a negative radiation pressure, drawing the up into the water, and a droplet of wavelength order is extracted out of the bulk liquid and sonically trapped. Our work demonstrates the means of producing and manipulating droplets from a fluid interface without mechanical contact using a near-field acoustic tweezer.
- Received 7 September 2019
- Revised 13 November 2019
DOI:https://doi.org/10.1103/PhysRevApplied.12.061001
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