A dielectrophoretic filter for separation and collection of fine particles suspended in liquid

Guangbin Zhou, Manabu Imamura, Junya Suehiro, Masanori Hara

Research output: Contribution to journalConference articlepeer-review

22 Citations (Scopus)


Dielectrophoresis (DEP) is the electrokinetic motion of dielectrically polarized particles in nonuniform electric fields. DEP has found many useful technological applications including separation, levitation and characterization of dielectric particles such as biological cells. In this study, the authors propose a new type of liquid filter, which utilizes dielectrophoretic force (DEP force) to capture fine particles suspended in liquid. The DEP filter consists of an electrode system that is filled up with many dielectric particles. These particles modify the electric field distribution in the electrode system so that strong DEP force is generated on their surfaces. If the DEP force is stronger than drag force exerted by liquid flow in the filter, the suspended particles can be trapped and eliminated from the flowing liquid. The DEP filter can control trapping and releasing process just by changing electrode energizing ac signal and the resultant DEP force. It was experimentally confirmed that the DEP filter could continuously eliminate yeast cells suspended in water. The cell density decreased from 106 cells/mL to 101 cells/mL in about an hour. The electrical conductivity of the medium was a crucial parameter that influenced the liquid temperature by Joule heating and DEP force. Further-more, the selective separation of viable and nonviable yeast cells was demonstrated by utilizing viability dependency of the DEP force.

Original languageEnglish
Pages (from-to)1404-1411
Number of pages8
JournalConference Record - IAS Annual Meeting (IEEE Industry Applications Society)
Publication statusPublished - 2002
Event37th IAS Annual Meeting and World Conference on Industrial applications of Electrical Energy - Pittsburgh, PA, United States
Duration: Oct 13 2002Oct 18 2002

All Science Journal Classification (ASJC) codes

  • Control and Systems Engineering
  • Industrial and Manufacturing Engineering
  • Electrical and Electronic Engineering


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