Browsing by Author "Wei, Jen-Hung"

Now showing 1 - 2 of 2

Realizing temperature-controlled digital microfluidic chips with versatile microelectrodes
(2007)
Wei, Jen-Hung
;
Hsu, Wen-Syang
;
Fan, Shih-Kang
;
機械工程學系
;
Department of Mechanical Engineering
Droplet heating and pumping were performed on a versatile microelectrode by selectively applying appropriate electric signals. The designed electrode is in a meander-tine shape and covered by an insulator. On the one hand, when a potential difference is applied along the electrode, power dissipated by the resistance of the electrode causes droplet heating. On the other hand, when an electric field exists across the insulator above the electrode, the charges stored in the capacitor alter the surface wettability and pump droplet. Manipulated droplets were placed between parallel plates with passivated versatile microelectrodes on the bottom plate and a Teflon-coated blank ITO on the top plate. We successfully applied a DC voltage at the two terminals of the meander-tine electrode to heat up the electrode as well as the droplet above. Besides, pumping droplets by EWOD was demonstrated by applying a proper AC voltage between the electrode on the bottom plate and the ITO on the top plate. With the proposed versatile microelectrode design and actuation scheme, heating and EWOD were obtained on an identical electrode. A digital microfluidic chip capable of droplet manipulation by EWOD and droplet heating was presented.
Reflective electronic paper display utilizing electric polarized particle chains
(2007)
Chiu, Cheng-Pu
;
Huang, Po-Wen
;
Fan, Shih-Kang
;
Wei, Jen-Hung
;
Hsu, Wensyang
We demonstrated a display technique by applying an AC field to polarize the originally evenly dispersed microparticles in liquid solution. The polarized particles would attract each other and form particle chains along the field lines. As a result, the light transmittance of the liquid can be regulated as a reflective display.