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dc.contributor.authorFan, Shih-Kangen_US
dc.contributor.authorHuang, Po-Wenen_US
dc.contributor.authorWang, Tsu-Teen_US
dc.contributor.authorPeng, Yu-Haoen_US
dc.date.accessioned2014-12-08T15:11:04Z-
dc.date.available2014-12-08T15:11:04Z-
dc.date.issued2008-08-01en_US
dc.identifier.issn1473-0197en_US
dc.identifier.urihttp://dx.doi.org/10.1039/b803204aen_US
dc.identifier.urihttp://hdl.handle.net/11536/8484-
dc.description.abstractTwo important electric forces, dielectrophoresis (DEP) and electrowetting-on-dielectric (EWOD), are demonstrated by dielectric-coated electrodes on a single chip to manipulate objects on different scales, which results in a dielectrophoretic concentrator in an EWOD-actuated droplet. By applying appropriate electric signals with different frequencies on identical electrodes, EWOD and DEP can be selectively generated on the proposed chip. At low frequencies, the applied voltage is consumed mostly in the dielectric layer and causes EWOD to pump liquid droplets on the millimetre scale. However, high frequency signals establish electric fields in the liquid and generate DEP forces to actuate cells or particles on the micrometre scale inside the droplet. For better performance of EWOD and DEP, square and strip electrodes are designed, respectively. Mammalian cells (Neuro-2a) and polystyrene beads are successfully actuated by a 2 MHz signal in a droplet by positive DEP and negative DEP, respectively. Droplet splitting is achieved by EWOD with a 1 kHz signal after moving cells or beads to one side of the droplet. Cell concentration, measured by a cell count chamber before and after experiments, increases 1.6 times from 8.6 x 10(5) cells ml(-1) to 1.4 x 10(6) cells ml(-1) with a single cycle of positive DEP attraction. By comparing the cutoff frequency of the voltage drop in the dielectric layer and the cross-over frequency of Re(f(CM)) of the suspended particles, we can estimate the frequency-modulated behaviors between EWOD, positive DEP, and negative DER A proposed weighted Re(f(CM)) facilitates analysis of the DEP phenomenon on dielectric-coated electrodes.en_US
dc.language.isoen_USen_US
dc.titleCross-scale electric manipulations of cells and droplets by frequency-modulated dielectrophoresis and electrowettingen_US
dc.typeArticleen_US
dc.identifier.doi10.1039/b803204aen_US
dc.identifier.journalLAB ON A CHIPen_US
dc.citation.volume8en_US
dc.citation.issue8en_US
dc.citation.spage1325en_US
dc.citation.epage1331en_US
dc.contributor.department材料科學與工程學系奈米科技碩博班zh_TW
dc.contributor.departmentGraduate Program of Nanotechnology , Department of Materials Science and Engineeringen_US
dc.identifier.wosnumberWOS:000258572400013-
dc.citation.woscount60-
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