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Appl. Sci. 2018, 8(1), 73;

Controllable Micro-Particle Rotation and Transportation Using Sound Field Synthesis Technique

State Key Laboratory of Fluid Power and Mechatronic Systems, School of Mechanical Engineering, Zhejiang University, 38 Zheda Road, Hangzhou 310027, China
State Key Laboratory for Strength and Vibration of Mechanical Structures, School of Aerospace Engineering, Xi’an Jiaotong University, 28 West Xianning Road, Xi’an 710049, China
School of Mechanical and Automatic Control, Zhejiang Sci-Tech University, Hangzhou 310018, China
School of Engineering, Qufu Normal University, Rizhao 276825, China
Authors to whom correspondence should be addressed.
Received: 4 December 2017 / Revised: 26 December 2017 / Accepted: 3 January 2018 / Published: 8 January 2018
(This article belongs to the Section Acoustics and Vibrations)
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Rotation and transportation of micro-particles using ultrasonically-driven devices shows promising applications in the fields of biological engineering, composite material manufacture, and micro-assembly. Current interest in mechanical effects of ultrasonic waves has been stimulated by the achievements in manipulations with phased array. Here, we propose a field synthesizing method using the fewest transducers to control the orientation of a single non-spherical micro-particle as well as its spatial location. A localized acoustic force potential well is established and rotated by using sound field synthesis technique. The resultant acoustic radiation torque on the trapped target determines its equilibrium angular position. A prototype device consisting of nine transducers with 2 MHz center frequency is designed and fabricated. Controllable rotation of a silica rod with 90 μm length and 15 μm diameter is then successfully achieved. There is a good agreement between the measured particle orientation and the theoretical prediction. Within the same device, spatial translation of the silica rod can also be realized conveniently. When compared with the existing acoustic rotation methods, the employed transducers of our method are strongly decreased, meanwhile, device functionality is improved. View Full-Text
Keywords: micro-particle rotation; sound field synthesis technique; acoustic radiation torque micro-particle rotation; sound field synthesis technique; acoustic radiation torque

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Deng, S.; Jia, K.; Wu, E.; Hu, X.; Fan, Z.; Yang, K. Controllable Micro-Particle Rotation and Transportation Using Sound Field Synthesis Technique. Appl. Sci. 2018, 8, 73.

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