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제125회 대한화학회 학술발표회 및 총회 Manipulation of fluid on open paper-based DMF chip

2020년 2월 6일 16시 47분 29초
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Material Chemistry
저자 및
Nayoon Pyun, Kwanwoo Shin*
Department of Chemistry, Sogang University, Korea
Manipulation of a droplet is an important part of lab-on-a-chip which allows performing many steps of an experiment carried out in the lab on a small chip, such as mixing, reacting, detecting the sample. In our lab, we are studying manipulation of the droplet on the printed electrode on paper with the inkjet printing method. Herein inkjet printing method is familiar to us and good for popularization. Also, the paper as a substrate can highlight this advantage. Movement of the droplet is commonly controlled by electrowetting on the dielectric layer (EWOD), Which is controlling wettability by applying an electric field on the dielectric layer. When the electric field is applied, the free charge in polar molecules goes towards the electrode which is the positive charge and the contact angle is decreased and makes droplet move. However, there is a limitation of contact angle saturation that means droplet will not spread any further after a certain degree, and it can only operate in polar molecules. Accordingly, we introduced dielectrowetting, which is controlling droplet by using polarization effect on neutral particles in the un-uniformed electric field(dielectrophoresis), to supplement this limitation. For this purpose, the interdigitated finger electrode is designed to reinforce the un-uniformity of the electric field. Using this principle, the contact angle can be decreased up to complete wetting, and make the droplet move better.