Journal
IEEE TRANSACTIONS ON ULTRASONICS FERROELECTRICS AND FREQUENCY CONTROL
Volume 59, Issue 6, Pages 1258-1266Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TUFFC.2012.2316
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Funding
- Engineering and Physical Sciences Research Council, UK
- PCT Ltd. (Aberdeen, UK)
- Logitech Ltd. (Old Kilpatrick, Glasgow, UK)
- Microengineering and Biomaterial Research Group at the University of Dundee, Loadpoint Ltd. (Swindon, UK)
- EPSRC [EP/G01213X/1, EP/G012075/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/G01213X/1, EP/G012075/1] Funding Source: researchfish
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Ultrasonic particle manipulation tools have many promising applications in life sciences, expanding on the capabilities of current manipulation technologies. In this paper, the ultrasonic manipulation of particles and cells along a microfluidic channel with a piezoelectric array is demonstrated. An array integrated into a planar multilayer resonator structure drives particles toward the pressure nodal plane along the centerline of the channel, then toward the acoustic velocity maximum centered above the subset of elements that are active. Switching the active elements along the array moves trapped particles along the microfluidic channel. A 12-element 1-D array coupled to a rectangular capillary has been modeled and fabricated for experimental testing. The device has a 300-mu m-thick channel for a half-wavelength resonance near 2.5 MHz, with 500 mu m element pitch. Simulation and experiment confirm the expected trapping of particles at the center of the channel and above the set of active elements. Experiments demonstrated the feasibility of controlling the position of particles along the length of the channel by switching the active array elements.
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