https://scholars.lib.ntu.edu.tw/handle/123456789/409253
標題: | Exploiting the wall-induced non-inertial lift in electrokinetic flow for a continuous particle separation by size | 作者: | Lu X. Hsu J.-P. Xuan X. |
公開日期: | 2015 | 卷: | 31 | 期: | 1 | 起(迄)頁: | 620-627 | 來源出版物: | Langmuir | 摘要: | Separating particles from a heterogeneous mixture is important and necessary in many engineering and biomedical applications. Electrokinetic flow-based continuous particle separation has thus far been realized primarily by the use of particle dielectrophoresis induced in constricted and/or curved microchannels. We develop in this work a new electrokinetic method that exploits the wall-induced non-inertial lift in a straight uniform microchannel to continuously separate particles by intrinsic properties (e.g., size and surface charge). Such an electrically originated lift force arises from the asymmetric electric field distribution around a particle nearby a planar dielectric wall. We demonstrate this method through separating both a binary and ternary mixture of dispersed polystyrene microspheres by size in a T-shaped microchannel. A semi-analytical model is also developed to simulate and understand the particle separation process. The predicted particle trajectories in the entire microchannel agree reasonably well with the experimental measurements. ? 2014 American Chemical Society. |
URI: | https://scholars.lib.ntu.edu.tw/handle/123456789/409253 | ISSN: | 07437463 | DOI: | 10.1021/la5045464 |
顯示於: | 化學工程學系 |
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