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arXiv 1208.2640physics.flu-dyn
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微结构疏水表面尺度效应驱动液滴的研究

Driving Droplet by Scale Effect on Microstructured Hydrophobic Surfaces

Cunjing Lv, Pengfei Hao

摘要:

提出了一种新型的水滴在微结构疏水表面上的输运方式,并从实验和理论上进行了研究--水滴可以通过尺度效应来驱动,这与传统的水滴输运方式不同。制备了梯度微结构疏水表面,其中面积分数保持恒定,但微柱的尺度单调变化。当外加水或水平振动时,水滴会沿小尺度向大尺度方向单向运动,从而降低其总表面能。基于线张力模型的一种新的机理可以用来解释这一现象。动态接触角随微柱尺度的增大而减小。这些新发现将加深我们对拓扑结构与润湿性能之间关系的理解,并且对微流体系统中液滴传输装置的设计非常有帮助。

英文摘要:

A new type of water droplet transportation on microstructured hydrophobic surface is proposed and investigated experimentally and theoretically - water droplet could be driven by scale effect which is different from the traditional methods. Gradient microstructured hydrophobic surface is fabricated in which the area fraction is kept constant, but the scales of the micro-pillars are monotonic changed. When additional water or horizontal vibration is applied, the original water droplet could move unidirectionally to the direction from the small scale to the large scale to decrease its total surface energy. A new mechanism based on line tension model could be used to explain this phenomenon. It is also found that dynamic contact angle decreases with increasing the scale of the micro-pillars along the moving direction. These new findings will deepen our understanding of the relationship between topology and wetting properties, and could be very helpful to design liquid droplet transportation device in microfluidic systems.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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