Superpositioned dielectrophoresis for enhanced trapping efficiency
2005 (English)In: Electrophoresis, ISSN 0173-0835, E-ISSN 1522-2683, Vol. 26, no 22, 4252-4259 p.Article in journal (Refereed) Published
One of the major applications for dielectrophoresis is selective trapping and fractionation of particles. If the surrounding medium is of low conductivity, the trapping force is high, but if the conductivity increases, the attraction decreases and may even become negative. However, high-conductivity media are essential when working with biological material such as living cells. In this paper, some basic calculations have been performed, and a model has been developed which employs both positive and negative dielectrophoresis in a channel with interdigitated electrodes. The finite element method was utilized to predict the trajectories of Escherichia coli bacteria in the superpositioned electrical fields. It is shown that a drastic improvement of trapping efficiency can be obtained in this way, when a high conductivity medium is employed.
Place, publisher, year, edition, pages
2005. Vol. 26, no 22, 4252-4259 p.
alternating current electrokinetics; dielectrophoresis; Escherichia coli; field superposition; trajectory analysis
Engineering and Technology
IdentifiersURN: urn:nbn:se:kth:diva-5516DOI: 10.1002/elps.200500068ISI: 000233740900003ScopusID: 2-s2.0-28244475356OAI: oai:DiVA.org:kth-5516DiVA: diva2:9908
QC 201008202006-03-222006-03-222010-08-20Bibliographically approved