關於poster建議: 1. 海報size:指定的Maximum 2. 海報的logo:實驗室+交大+microTAS2006(那時我忘記放MEMS'06的logo) 3. 有動態影片才需要notebook播放,poster時別人比較喜歡跟你聊天 4. 顏色要一致(推薦Book:配色王) 5. 背搞(在飛機上無聊的時候背吧^^) 附件:那時候我自己寫的稿 May I introduce my research for you? INTRODUCTION The electrowetting-on-dielectric (EWOD) is an electrical means to change the surface wettability on a dielectric coated electrode. When we apply voltage between solid electrode and the tip immersed the droplet, the surface is changed from hydrophobic to hydrophilic. The conventional fabrication process all use solid electrode. Now we jump out this thinking. Our innovation is that use liquid electrode instead of solid electrode. Like figure shown. This formula describes the relationship between contact angle and applied voltage. SAMPLE PREPARATION Our sample preparation is very easy. We just coat Teflon on the PVDC film. Dispense two droplets on the both side of sheet. We all use 1 kHz various voltage as signals. RESULT and APPLICATION Left figure shows that when we applied voltage between the liquid electrode and droplet. We found it also has EWOD phenomenon. When the liquid electrode is shrunk to a comparable volume of upper droplet, we found two interesting phenomena. As shown in figure, one is Mirror-EWOD. It’s because that EWOD occurs simultaneously across the dielectric film. As increasing the voltage, the two droplets get wetting and wetting. The other is self-aligned. As figure shown, the original positions of two droplets are not aligned. When voltage is applied between the probes, the mirror-EWOD force would bring them aligned. APPLICATION: MANIPULATION DROPLETS Based on these discoveries, we design a direct handwriting droplet manipulation platform. A water droplet is placed between a Teflon coated ITO (Indium Tin Oxide) glass and a PVDC sheet. On top of the PVDC sheet is a droplet-tipped stylus. When a voltage turns on, we move the stylus then the manipulated droplet follow upper droplets like middle figure shown. Such a platform exploits EWOD without electrode patterns and reduces the complexity and cost of fabrication. It’s because this system consume little power. Portability can come true, and a battery powered mirror-EWOD system was established. The function generator was replaced by a timer/oscillator IC to provide a 1 kHz square wave signal. The signal was then be amplified by audio transformers to 140 Vrms. APPLICATION: Disposable Dielectric Layer EWOD Devices PVDC was also tested in a conventional EWOD device as a dielectric layer SUMMARY We demonstrate a novel approach to generate electrowetting on a dielectric sheet over a liquid electrode. Two important phenomena were found: (1)EWOD not only occurs on the manipulated droplet, but also the liquid electrode (mirror-EWOD) (2)The mirror-EWOD causes the manipulated droplet and the liquid electrode self-aligned when they are in comparable sizes. Based on these discoveries, a direct handwriting droplet manipulation platform was designed and fabricated. --

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