Multi-level separation of particles using acoustic radiation force and hydraulic force in a microfluidic chip

  • Guojun Liu
  • Fang He
  • Xinbo Li
  • Hong ZhaoEmail author
  • Yanyan Zhang
  • Zhiqiang Li
  • Zhigang Yang
Research Paper


Combined with acoustic separation and hydraulic separation technology, a microfluidic chip, which can achieve multi-level particle separation, is proposed in this work. The chip uses the sheath flow on both sides to align the mixed particles in the set area (near the side of the channel) of the separation channel. And then, the mixed particles successively pass through the acoustic surface wave and hydraulic action area, which are generated by modulating interdigital transducers and adjusting the flow ratio, respectively, and finally realize multiple particle separation under the acoustic radiation and hydraulic force. The corresponding separation experiments were carried out using polystyrene (PS) microparticles with diameters of 1 µm, 5 µm, and 10 µm, respectively. Moreover, we explored the influence of the peak-to-peak voltage (Vpp) and flow ratio on the PS microparticles separation effect, and the separation effect is optimal at the flowrate in the main channel is 4 mm/s, Vpp = 25 V, A1 = 0.2, A2 = 0.5. Under these conditions, the separation purity of 1 µm, 5 µm, and 10 µm PS microparticles are 95.60%, 91.67%, 93.75%, respectively, and their separation rates are 96.67%, 89.19%, and 96.77%, respectively. The combined multi-level separation chip has the advantages of simple structure, high separation accuracy, high separation efficiency, and the ability to sort multiple particles, which can be applied to chemical analysis, cell sorting, biomedicine.


Microfluidic chip Multi-level separation Acoustic radiation force Hydraulic force Combined separation Surface acoustic wave 



Financial support from the Jilin Province Natural Science Foundation Projects (No. 20170101136JC), the National Natural Science Foundation Projects (Nos. 51375207; 51875234), and the Jilin Provincial Department of Education Project (JJKH20190140KJ) are gratefully acknowledged.


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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  1. 1.College of Mechanical and Aerospace EngineeringJilin UniversityChangchunChina
  2. 2.College of Communication EngineeringJilin UniversityChangchunChina
  3. 3.Scientific Research CenterChina-Japan Union Hospital of Jilin UniversityChangchunChina

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