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Interaction Forces between Water Droplets and SolidSurfaces across Air Films

机译：水滴与固体之间的相互作用力气膜表面

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Wetting of solid surfaces occurs when the intervening air film between a water droplet and a solid surface ruptures. Although this rupturing phenomenon is well known, the underlying mechanism has not yet been well understood. In this work, the rupture of intervening air films is systematically studied by measuring the spatiotemporal thickness profiles of the air films between droplets of deionized water and flat solid surfaces using a synchronized triwavelength reflection interferometry microscope. It has been shown that the critical rupture thickness of the air film (hc) depends on the surface hydrophobicity of solid surfaces. The hc value was increased from 50 nm on a hydrophobic surface having an equilibrium water contact angle (θw) of 96° to 1.42 μm on a hydrophilic surface having a θw of 25°. In addition, an increase in the critical rupture thickness with decreasing surface hydrophobicity was found to be applicable not only to chemically treated quartz surfaces but also to a variety of natural mineral surfaces. By determining the pressure within the air films, we have shown that a strong attractive force is presentbetween water droplets and hydrophilic surfaces, thereby acceleratingthe draining of air films. The measured forces might be of electrostaticorigin, and the forces become less attractive with increasing hydrophobicityof solid surfaces. The present result provides a fundamental insightinto the rupture of air films from the perspective of surface forces.
机译：当水滴和固体表面之间的中间空气膜破裂时，会发生固体表面的润湿。尽管这种破裂现象是众所周知的，但是其潜在机理尚未被很好地理解。在这项工作中，通过使用同步三波长反射干涉仪测量去离子水液滴与平坦固体表面之间气膜的时空厚度分布，系统地研究了气膜的破裂。已经表明，气膜的临界破裂厚度（hc）取决于固体表面的表面疏水性。 hc值从平衡水接触角（θw）为96°的疏水表面上的50 nm增加到θw为25°的亲水表面上的1.42μm。另外，发现临界破裂厚度的增加和表面疏水性的降低不仅适用于化学处理的石英表面，而且适用于多种天然矿物表面。通过确定气膜内的压力，我们表明存在强大的吸引力在水滴和亲水表面之间，从而加速排出空气膜。测得的力可能是静电的起源，并且随着疏水性的增加，吸引力变得越来越小固体表面。目前的结果提供了基本见解从表面力的角度分析空气膜的破裂。

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