| Summary: | 碩士 === 國立交通大學 === 奈米科技研究所 === 96 === Droplet-based microfluidics, i.e., digital microfluidics, has drawn much attention for its potential applications in optics, electrics, and lab-on-a-chip. Several droplet driving mechanisms have been investigated in a parallel plate device. Among them, electrical means are intensively researched for their simple actuation and device design, such as dielectrophoresis (DEP) and electrowetting-on-dielectric (EWOD). However, in most DEP and EWOD droplet manipulations, conductive and aqueous solutions were usually examined, including human physiological fluids. Although non-aqueous solvents and solutions were previously actuated by EWOD, dielectric droplets have not been successfully pumped. To realize a digital�n��-TAS, driving both conductive and dielectric droplets is mandatory. In this thesis, Dielectric droplets are successfully manipulated by electropolarization forces in a parallel plate device, which extends the liquid handling capability of digital microfluidics from merely conductive droplets to dielectric ones. Actuations of silicone oil, decane, and hexadecane droplets in a 150-μm-high gap between parallel plates are demonstrated. Silicone oil droplets of different viscosities, 20 and 50 cSt, are transported and split in various gaps heights, demonstrating the manipulation capabilities of electropolarization forces. The threshold and splitting voltages are measured and compared. Moreover, the relationship between the velocity and driving voltage is studied.
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