Microscale tracking of unconstrained moving multiphase contact lines via a capacitance sensor array
Microscale tracking of unconstrained moving multiphase contact lines via a capacitance sensor array
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DOI：
10.1016/j.sna.2021.113046
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发表时间：
2021-08
影响因子：
4.6
通讯作者：
Tanbin Hasan Mondal;Tithi Desai;Rifat Hossain;A. Moore
中科院分区：
文献类型：
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作者：
Tanbin Hasan Mondal;Tithi Desai;Rifat Hossain;A. Moore
及时跟踪移动多相接触线的空间位置的能力显着增强了对生物过程、基于冷凝和蒸发的传热以及许多其他重要现象背后的基础物理的理解。在这项工作中，我们提出了一种基于电容的微型器件，能够在微尺度上跟踪不受约束的液滴的移动相界面。该微型器件由薄绝缘聚合物层下方的平面叉指电极阵列组成。监测电容随时间的变化有助于感测多相接触线轮流经过每个电容传感器时的位置和速度。这种电容式传感方案被设计为对所研究的液滴高度敏感且无创。结果表明，确实能够通过传感器阵列中电容信号的变化来检测移动的多相接触线前进和后退的速度和位置。还表明该阵列可用于测量不受约束的液滴的前进和后退接触角。
The ability to track the spatial location of a moving multiphase contact line in time significantly enhances understanding into the fundamental physics behind biological processes, condensation- and evaporation-based heat transfer, and a host of other important phenomena. In this work, we present a capacitance-based microdevice capable of tracking a moving phase interface at the microscale for an unconstrained liquid droplet. The microdevice is comprised of an array of planar interdigitated electrodes beneath a thin insulating polymer layer. Monitoring changes in capacitance with time facilitates sensing of the multiphase contact line location and speed as it passes over each capacitance sensor in turn. This capacitive sensing scheme is designed to be highly sensitive and noninvasive to the droplet under study. Results show the speed and location of moving multiphase contact lines for advancing and receding water droplets are indeed able to be detected through the change in capacitance signals in the sensor array. It is also shown that the array can be used to measure the advancing and receding contact angles of unconstrained droplets.