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首页> 外文会议>American Society of Mechanical Engineers(ASME) Integrated Nanosystems Conference: Design, Synthesis, and Applications(NANO 2004); 20040922-24; Pasadena,CA(US) >MASS TRANSPORT PHENOMENA IN SUPERHYDROPHOBIC SURFACES
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MASS TRANSPORT PHENOMENA IN SUPERHYDROPHOBIC SURFACES

机译：超疏水表面的传质现象

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摘要

We present results of a droplet placed on a controlled super-hydrophobic surface cooled underneath by a thermal electrical cooler to demonstrate quick change in contact angles from the Cassie composite contact state to the Wenzel wetting contact state. The measured contact angles are compared with the theoretical predictions of Cassie's and Wenzel's equations and found to be consistent. The actual details of the transition phenomena are observed under a microscope through a specially designed one-dimensional micro-channel with concaved structures at the two sidewalls. It is found that the temperature gradient enhanced mass transfer can cause a rapid condensation in the air-filled cavities, which is believed to be the possible mechanism to trigger the energy state transition and explain instabilities of super-hydrophobic surfaces at the Cassie state. The phenomenon of mass transport into micro and nanocavities is important in understanding the nature of nano-structured super-hydrophobic surfaces.
机译：我们提出了将液滴放置在由热电冷却器在其下方冷却的受控超疏水表面上的结果，以证明从Cassie复合接触状态到Wenzel润湿接触状态的接触角快速变化。将测得的接触角与Cassie和Wenzel方程的理论预测值进行比较，发现是一致的。在显微镜下，通过特殊设计的一维微通道在两个侧壁上都具有凹入结构，可以观察到过渡现象的实际细节。发现温度梯度增强的传质可引起充气腔中的快速凝结，这被认为是触发能量状态转变并解释卡西状态下超疏水表面不稳定性的可能机理。质量传递到微腔和纳米腔中的现象对于理解纳米结构的超疏水表面的性质很重要。

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