用摩擦起电量化润湿动力学
Quantifying Wetting Dynamics with Triboelectrification
摘要：
润湿通常被认为是材料的固有表面特性，但确定其演变是复杂的，其复杂的依赖于整个尺度的粗糙度。Wenzel状态，其中液体与粗糙基底紧密接触，以及Cassie-Baxter状态，其中液体坐在粗糙体之间形成的气穴上，只是众多润湿行为中的两种状态。此外，从Cassie-Baxter状态到Wenzel状态的转变决定了完全不同的表面性能，例如抗污染、抗结冰、减阻等;然而，关于在几种润湿模式之间的时间期间如何发生转变知之甚少。在本文中，我们表明，润湿动力学可以准确地量化和跟踪使用固液摩擦起电。理论基础揭示了表面微/纳米几何形状如何调节稳定性/渗透，也表明了我们的理论方法在理解润湿转变的一般性。
英文摘要：
Wetting is often perceived as an intrinsic surface property of materials, but determining its evolution is complicated by its complex dependence on roughness across the scales. The Wenzel state, where liquids have intimate contact with the rough substrate, and the Cassie-Baxter state, where liquids sit onto air pockets formed between asperities, are only two states among the plethora of wetting behaviors. Furthermore, transitions from the Cassie-Baxter to the Wenzel state dictate completely different surface performance, such as anti-contamination, anti-icing, drag reduction etc.; however, little is known about how transition occurs during time between the several wetting modes. In this paper, we show that wetting dynamics can be accurately quantified and tracked using solid-liquid triboelectrification. Theoretical underpinning reveals how surface micro-/nano-geometries regulate stability/infiltration, also demonstrating the generality of our theoretical approach in understanding wetting transitions.
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