標題: Reconfigurable liquid pumping in electric-field-defined virtual microchannels by dielectrophoresis
作者: Fan, Shih-Kang
Chen, Wen-Jung
Lin, Tin-Hsu
Wang, Tsu-Te
Lin, Yen-Chen
材料科學與工程學系奈米科技碩博班
Graduate Program of Nanotechnology , Department of Materials Science and Engineering
公開日期: 2009
摘要: Dielectrophoresis (DEP), widely used to generate body forces on suspended particles, is investigated to provide surface forces at the liquid-medium interfaces and pump a high-permittivity liquid in a low-permittivity medium along a virtual microchannel defined by an electric field between parallel plates. Because the pumping pressure is proportional to the square of the intensity of the electric field and independent of the channel width, DEP pumping is advantageous as the dimension of the microchannel shrinks down. The absence of the channel walls simplifies the fabrication processes and further increases its feasibility in nanofluidic applications. We demonstrate water pumping in an immiscible silicone oil medium at adjustable velocities by applying voltages above the threshold value whose square is linearly proportional to the cross-sectional aspect ratio (AR), i.e., the height to width ratio, of the microchannel. With a properly designed AR, liquid valve is achieved by appropriate voltage applications. Without the barriers of channel walls, merging multiple streams and capillary filling of the spacing between electric-field-defined virtual microchannels are observed and studied. Moreover, in situ reconfigurable liquid pumping is demonstrated by a four way switching valve on a programmable crossing electrode set.
URI: http://hdl.handle.net/11536/7766
http://dx.doi.org/10.1039/b900790c
ISSN: 1473-0197
DOI: 10.1039/b900790c
期刊: LAB ON A CHIP
Volume: 9
Issue: 11
起始頁: 1590
結束頁: 1595
顯示於類別:期刊論文


文件中的檔案:

  1. 000266269400016.pdf