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Slipperiness and stability of hydrophilic surfaces coated with a lubricating fluid

机译：涂有润滑液的亲水性表面的滑性和稳定性

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摘要

In recent years, many research groups have studied the slipperiness of rough or porous hydrophobic surfaces infused with a lubricating fluid. Here, we alternatively present a simple method to fabricate stable slippery surfaces on hydrophilic samples, which are more commonly and widely used. At room temperature, hydrophilic samples lubricated with silicone oil did not present a slippery surface for water drops, which were observed to sink into the oil layer due to the inherently hydrophilic surface. Annealing these samples at higher temperatures, however, caused the silicone molecules to covalently bind the silicon surface, hence making the surface hydrophobic. At an optimized annealing temperature and annealing time, the surfaces showed excellent slipperiness, with negligible contact angle hysteresis and low sliding angles. Water drops on the slippery surfaces were found to be enveloped, or cloaked, in a thin layer of the lubricating oil, which minimized the oil-water interfacial energy. Upon sliding, these oil-cloaked water drops slowly removed lubricating oil, which resulted in the degradation of the slipperiness. This degradation was prevented when using large water drops or a continuous flow of water.
机译：近年来，许多研究小组研究了注入润滑液的粗糙或多孔疏水表面的光滑性。在这里，我们可以选择一种简单的方法来在亲水性样品上制造稳定的光滑表面，这是更普遍和广泛使用的方法。在室温下，用硅油润滑的亲水性样品不会出现水滑的表面，观察到由于固有的亲水性表面而沉入油层。但是，在较高温度下对这些样品进行退火会使硅酮分子与硅表面共价键合，从而使表面疏水。在最佳的退火温度和退火时间下，表面表现出优异的滑爽性，接触角滞后可以忽略不计，滑动角较小。发现在光滑表面上的水滴被润滑油的薄层包裹或掩盖了，这使油水界面能最小化。滑动时，这些油浸的水滴会缓慢地除去润滑油，从而导致滑爽性下降。当使用大水滴或连续水流时，可以防止这种降解。

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