Journal
APPLIED PHYSICS LETTERS
Volume 116, Issue 3, Pages -Publisher
AIP Publishing
DOI: 10.1063/1.5142670
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Funding
- National Natural Science Foundation of China [11804060]
- Youth HundredTalents Program of Guangdong University of Technology [220413195]
- Seed Fund Program of the School of Electromechanical Engineering
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In this Letter, we report two-dimensional focusing of microparticles in a glass capillary whose cross section is square outside and round inside using bulk acousto-microfluidics. An imaging system allowing measurements of three-dimensional microparticle acoustophoresis is designed to simultaneously present the two-dimensional focusing processes from combinations of vertical and lateral views in a same frame. The underlying mechanisms of microparticle acoustophoresis in the glass capillary device are explained by a full-device numerical model, which solves the coupling of ultrasonic transducer, glass, and fluid layers of the experimental device. We show here that decent two-dimensional microparticle focusing can be achieved when acoustic pressure nodal lines are generated on cross sections of the fluid channel from the excitation of a single ultrasonic transducer. Based on the developed understanding, we further demonstrate here robust two-dimensional focusing of microparticles by creating an acoustic pressure node point at the channel center from excitations of two orthogonally placed ultrasonic transducers.
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