Separation technique of sub-micron particles using electrokinetically driven flow

Takahiro Yamamoto, Shankar Devasenathipathy, Yohei Sato, Koichi Hishida

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)


An electrokinetic separation and/or filtering technique of charged order one-micron diameter particles in solution is demonstrated for further development of a multi-phase microfluidic device. Two buffered particle-laden streams of different ionic conductivities are introduced through a simple T-shaped microchannel. The fluid is driven by both pressure and a DC electric field. Upon application of an electric field, the particles are extracted from the lower conductivity stream and stacked into the higher conductivity stream. Both particle density imaging and quantiative velocity fields using micron resolution particle image velocimetry are presented in order to investigate the flow and electric fields. Numerical simulations of the process in the conductivity gradient show the generation of a transverse electric field, consequently force acting on particles is selectively controlled in a simple geometry microcannel.

Original languageEnglish
Pages (from-to)2378-2385
Number of pages8
JournalNippon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B
Issue number697
Publication statusPublished - 2004 Sept


  • Conductivity
  • Electrokinetic Phenomena
  • Micro PIV
  • Selective Separation
  • Sub-Micron Particles

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanical Engineering


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