【摘要】 介质上的电润湿(EWOD)数字微流控芯片的设计中,随着电极数量的增加,需要更多的控制信号,引出导线的设计复杂程度将会显著增加。根据接触线理论,提出一种运输方向上非对称的电极设计,使液滴两侧的电极同时加电压时,施加在液滴两侧的电润湿力不平衡,液滴向指定方向驱动。该新型器件只需两个信号即可实现液滴长距离、大规模的单向运输。通过COMSOL仿真软件对器件在电压作用下液滴受力和运动情况进行了表征,并制作及测试芯片对其功能进行了验证。仿真和测试结果表明:通过两个驱动信号的重复交替,能够在一维路径上稳定地实现单向运输。更多还原

【Abstract】 In design of electrowetting-on-dielectric( EWOD) digital microfluidic devices,more control signals are needed as the number of electrodes increases,and the design complexity of the lead wires is also increased significantly. An asymmetric electrode design in the transport direction according to the contact line theory is proposed. When voltage is applied simultaneously to the electrodes on both sides of the droplet,the electrowetting force on both sides of the droplet is unbalanced,and the droplet is transported in a specified direction. Therefore,the new device requires only two signals to achieve long-distance and large-scale unidirectional droplet transportation. A simulation model is developed using COMSOL Multiphysics to predict the EWOD force,pressure and droplet movement,and a verification experiment is also carried out to characterize the droplet actuation. Simulation and test results show that unidirectional transportation can be stably achieved on a one-dimensional path by repeated alternations of the two drive signals.更多还原