期刊
APPLIED PHYSICS LETTERS
卷 111, 期 9, 页码 -出版社
AMER INST PHYSICS
DOI: 10.1063/1.4992092
关键词
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资金
- EPSRC DTP studentship
- UK Engineering and Physical Science Research Council [EP/N014197/1, EP/N017641/1]
- Engineering and Physical Sciences Research Council [EP/N017641/1, EP/N014197/1, 1643650] Funding Source: researchfish
- EPSRC [EP/N017641/1, EP/N014197/1] Funding Source: UKRI
We report a simple and compact piezoelectric transducer capable of stably trapping single and multiple micro-particles in water. A 3D-printed Fresnel lens is bonded to a two-element kerfless piezoceramic disk and actuated in a split-piston mode to produce an acoustic radiation force trap that is stable in three-dimensions. Polystyrene micro-particles in the Rayleigh regime (radius lambda/14 to lambda/7) are trapped at the focus of the lens (F# = 0.4) and manipulated in two-dimensions on an acoustically transparent membrane with a peak trap stiffness of 0.43 mN/m. Clusters of Rayleigh particles are also trapped and manipulated in three-dimensions, suspended in water against gravity. This transducer represents a significant simplification over previous acoustic devices used for micro-particle manipulation in liquids as it operates at relatively low frequency (688 kHz) and only requires a single electrical drive signal. This simplified device has potential for widespread use in applications such as micro-scale manufacturing and handling of cells or drug capsules in biomedical assays. (C) 2017 Author(s).
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