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首页> 外文期刊>Journal of Physics, D. Applied Physics: A Europhysics Journal >Manipulated wettability of a superhydrophobic quartz crystal microbalance through electrowetting
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Manipulated wettability of a superhydrophobic quartz crystal microbalance through electrowetting

机译：通过电润湿控制超疏水石英晶体微天平的润湿性

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摘要

The liquid phase response of quartz crystal microbalances (QCMs) with a thin coating (～9 μm) of epoxy resin with and without a carbon nanoparticles top layer is reported. The nanoparticles convert the epoxy surface to a superhydrophobic one with a high static contact angle (～151°- 155°) and low contact angle hysteresis (～1°-3.7°) where droplets of water are in the suspended Cassie-Baxter state. The frequency decrease of the fully immersed QCM with the superhydrophobic surface is less than with only epoxy layer, thus indicating a decoupling of the QCM response. A wettability transition to a liquid penetrating into the surface roughness state (for droplets a high contact angle hysteresis Wenzel state) was triggered using a molarity-of-ethanol droplet test (MED) and electrowetting; the MED approach caused some surface damage. The electrowetting-induced transition caused a frequency decrease of 739 Hz at a critical voltage of ～100 V compared to the QCM in air. This critical voltage correlates to a contact angle decrease of 26° and a high contact angle hysteresis state in droplet experiments. These experiments provide a proof-of-concept that QCMs can be used to sense wetting state transitions and not only mass attachments or changes in viscosity-density products of liquids.
机译：报道了带有和不带有碳纳米颗粒顶层的环氧树脂薄涂层（〜9μm）的石英晶体微天平（QCM）的液相响应。纳米粒子将环氧表面转变为具有高静态接触角（〜151°-155°）和低接触角滞后（〜1°-3.7°）的超疏水表面，其中水滴处于悬浮的Cassie-Baxter状态。具有超疏水表面的完全浸入式QCM的频率下降小于仅具有环氧层的频率下降，因此表明QCM响应解耦。使用乙醇微滴试验（MED）和电润湿触发从润湿性转变为渗透到表面粗糙度状态的液体（对于液滴而言，接触角具有较高的迟滞性Wenzel态）。 MED方法造成了一些表面损坏。与空气中的QCM相比，在〜100 V的临界电压下，电润湿引起的过渡导致频率降低739 Hz。该临界电压与液滴实验中的26°接触角减小和高接触角滞后状态相关。这些实验提供了一个概念证明，即QCM可以用于检测润湿状态的转变，而不仅可以用于质量附着或液体粘度密度乘积的变化。

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