電動力橫跨於介電薄膜應用於操控微液珠與微米粒子之研究

Abstract

本論文的新概念為利用液態電極來驅動介電濕潤系統，所使用的介電層為12.5 微米厚的聚偏氯乙烯薄膜，在實驗的過程中發現兩種重要現象，一為鏡像介電濕潤，介電濕潤效應不只發生在被操控的液珠部分液態電極也有此現象發生，另一種現象為自我對稱現象，當兩液珠大約一樣大時會自我校正其位置，並運用此兩種現象提出一種新型驅動微液體的方式，手寫移動微液滴平台。並做出一個可用電池驅動的鏡像介電濕潤系統。 另一主題為三維絕緣介電泳粒子分離晶片，我們成功的分離出5微米與1微米聚苯乙烯珠，在實驗過程中我們可以觀察到5微米聚苯乙烯珠行負介電泳效應排開在洞口，1微米聚苯乙烯珠行正介電泳效應被吸入洞中。 最後希望能整合鏡像介電濕潤系統與三維絕緣介電泳達到實驗室晶片的概念。

In this thesis, we demonstrate a novel approach to generate electrowetting on a dielectric sheet over a liquid electrode. A 12.5 micrometer-thick PVDC film was used as the dielectric sheet. 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, in which droplets can be transported by a droplet-tipped stylus across a dielectric sheet. We also miniaturize this system to a battery powered mirror-EWOD portable device successfully. Another topic is that a particle separator was demonstrated based on 3-D iDEP (insulator-based dielectrophoresis). In this chip, we separate beads in 5-µm diameter and 1-µm diameter successfully. It was observed that the 5-µm beads were repelled from the microholes by nDEP and the 1-µm beads were trapped into microholes by pDEP. Finally, we hope to integrate mirror-EWOD and 3-D iDEP in one chip to achieve the concept of Lab-on-a-chip.