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利用MEMS技术制作了平板电润湿芯片,建立了可视化实验研究平台,运用高速CCD对分裂式电极施加交流电压后的液滴传输和合并过程以及相邻电极接地式芯片上液滴的交流振荡过程进行了可视化实验研究。除了对液滴形状的观测外,还重点关注了接触线的运动规律。研究发现,接触角滞后现象将导致接触线在液滴输运、合并以及振荡过程中出现停顿现象,在液滴振荡过程中,只有施加电压足够大时,才能克服这种迟滞现象。当液滴初始位置偏离电极对中心时,在一定条件下交流电作用将造成液滴形态左右摇摆、接触线非对称运动的非对称振荡现象。
The electrowetting chip was fabricated by using MEMS technology. A visualization experiment platform was set up. The droplet transfer and merging process after the AC voltage was applied to the split electrode by high-speed CCD and the AC oscillation of the droplet on the adjacent electrode Conducted a visual experimental study. In addition to the observation of the shape of the droplet, the focus is also on the movement of the contact line. It is found that the contact angle hysteresis will cause the contact line to pause during the droplet transport, integration and oscillation. During the oscillation of the droplet, the hysteresis can be overcome only when the applied voltage is large enough. When the initial position of the droplet deviates from the center of the electrode pair, under certain conditions, the alternating current action will cause the droplet form to swing left and right, and the asymmetrical oscillatory phenomenon of the contact line asymmetric movement.