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首页> 外文期刊>Journal of Micromechanics and Microengineering >Electrical actuation of electrically conducting and insulating droplets using ac and dc voltages
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Electrical actuation of electrically conducting and insulating droplets using ac and dc voltages

机译：使用交流和直流电压电驱动导电和绝缘液滴

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Electrical actuation of liquid droplets at the microscale offers promising applications in the fields of microfluidics and lab-on-chip devices. Much prior research has targeted the electrical actuation of electrically conducting liquid droplets using dc voltages (classical electrowetting). Electrical actuation of conducting droplets using ac voltages and the actuation of insulating droplets (using dc or ac voltages) has remained relatively unexplored. This paper utilizes an energy-minimization-based analytical framework to study the electrical actuation of a liquid droplet (electrically conducting or insulating) under ac actuation. It is shown that the electromechanical regimes of classical electrowetting, electrowetting under ac actuation and insulating droplet actuation can be extracted from the generic electromechanical actuation framework, depending on the electrical properties of the droplet, the underlying dielectric layer and the frequency of the actuation voltage. This paper also presents experiments which quantify the influence of the ac frequency and the electrical properties of the droplet on its velocity under electrical actuation. The velocities of droplets moving between two parallel plates under ac actuation are experimentally measured; these velocities are then related to the actuation force on the droplet which is predicted by the electromechanical model developed in this work. It is seen that the droplet velocities are strongly dependent on the frequency of the ac actuation voltage; the cut-off ac frequency, above which the droplet fails to actuate, is experimentally determined and related to the electrical conductivity of the liquid. This paper then analyzes and directly compares the various electromechanical regimes for the actuation of droplets in microfluidic applications.
机译：微米级液滴的电驱动在微流控和芯片实验室设备领域提供了有希望的应用。许多现有研究的目标是使用直流电压（经典的电润湿）来电驱动导电液滴。使用交流电压对导电液滴的电致动和使用直流或交流电压对绝缘液滴的致动仍相对未曾探索过。本文利用基于能量最小化的分析框架来研究交流驱动下液滴的电驱动（导电或绝缘）。结果表明，经典的电润湿，交流驱动下的电润湿和绝缘液滴驱动下的机电机制可以根据液滴的电学特性，下面的介电层和激励电压的频率从通用的机电驱动框架中提取出来。本文还提出了量化交流电频率和液滴电性能对其在电驱动下速度的影响的实验。实验中测量了在驱动下在两个平行板之间移动的液滴的速度。然后，这些速度与液滴上的驱动力有关，该作用力是由这项工作中开发的机电模型预测的。可以看出，液滴的速度很大程度上取决于交流激励电压的频率。通过实验确定了截止交流频率（高于该截止频率时液滴无法驱动），并且该交流频率与液体的电导率有关。然后，本文分析并直接比较了微流体应用中用于驱动液滴的各种机电方式。

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