Continuous separation technique of suspended particles by utilizing acoustic radiation and electrostatic force

Hiroya Ishida, Yohei Sato, Koichi Hishida

Research output: Contribution to journalArticle

Abstract

A particle separation technique in a sub-milli channel has been developed by utilizing acoustic radiation and electrostatic forces, which will be applicable to microfluidic devices. In the present study these forces act simultaneously on particles perpendicular to the flow direction. When the acoustic radiation force was applied by an ultrasound transducer, large and small particles in a buffer solution were trapped at nodal positions in the standing field, which was equal to half of the wavelength in the transverse direction. On simultaneous application of electric field to the channel, both forces acted on particles. Thus the magnitude of each force was estimated by using particle image and particle tracking velocimetry, by which the relationship between the acoustic radiation and electrostatic force acting on particles was investigated in order to separate particles in the flow field. Large particles were trapped at nodes by the acoustic radiation force without being affected by the electrostatic force, while small particles were moved toward anodes by the electrostatic force. This means that the particle separation based on diameter was accomplished by the present technique.

Original languageEnglish
Pages (from-to)2473-2480
Number of pages8
JournalNihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B
Volume72
Issue number10
Publication statusPublished - 2006 Oct

Fingerprint

Electrostatic force
sound waves
Acoustics
electrostatics
Radiation
Microfluidics
Velocity measurement
Transducers
Flow fields
Anodes
Ultrasonics
Electric fields
Wavelength
trapped particles
microfluidic devices
flow distribution
transducers
anodes
buffers
electric fields

Keywords

  • Acoustic radiation force
  • Electrophoresis
  • Electrostatic force
  • Particle separation
  • PIV

ASJC Scopus subject areas

  • Mechanical Engineering

Cite this

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abstract = "A particle separation technique in a sub-milli channel has been developed by utilizing acoustic radiation and electrostatic forces, which will be applicable to microfluidic devices. In the present study these forces act simultaneously on particles perpendicular to the flow direction. When the acoustic radiation force was applied by an ultrasound transducer, large and small particles in a buffer solution were trapped at nodal positions in the standing field, which was equal to half of the wavelength in the transverse direction. On simultaneous application of electric field to the channel, both forces acted on particles. Thus the magnitude of each force was estimated by using particle image and particle tracking velocimetry, by which the relationship between the acoustic radiation and electrostatic force acting on particles was investigated in order to separate particles in the flow field. Large particles were trapped at nodes by the acoustic radiation force without being affected by the electrostatic force, while small particles were moved toward anodes by the electrostatic force. This means that the particle separation based on diameter was accomplished by the present technique.",
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