Particle manipulation using an ultrasonic micro-gripper

We show that ultrasonic micro-grippers, 100 μm high segmented circular structures actuated with piezoelectric elements, can be used to establish a localised resonant pressure field within a fluid droplet, and hence allow effective manipulation of silica microspheres independently from the global bou...

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Bibliographic Details
Published in:Applied physics letters 2012-10, Vol.101 (16)
Main Authors: Walker, Robert, Gralinski, Ian, Keong Lay, Kok, Alan, Tuncay, Neild, Adrian
Format: Article
Language:English
Subjects:
Boundaries
Droplets
Fluid dynamics
Fluid flow
Fluids
Piezoelectricity
Position (location)
Simulation
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Summary:We show that ultrasonic micro-grippers, 100 μm high segmented circular structures actuated with piezoelectric elements, can be used to establish a localised resonant pressure field within a fluid droplet, and hence allow effective manipulation of silica microspheres independently from the global boundaries of the fluid volume. We demonstrate through experiments and simulations that despite variations in the fluid shape and location, the method achieves particle clustering in consistent locations at fixed operating frequencies.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.4759127