Is it Possible to Change Wettability of Hydrophilic Surface by Changing Its Roughness
Is it Possible to Change Wettability of Hydrophilic Surface by Changing Its Roughness
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DOI：
10.1021/jz401946v
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发表时间：
2013-10
影响因子：
5.7
通讯作者：
P. Pandey;Sudip Roy
中科院分区：
文献类型：
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作者：
P. Pandey;Sudip Roy
研究了亲水性方柱模型粗糙表面的润湿行为。亲水性柱在亲水性表面上等距间隔。通过改变柱宽度和柱间距来改变表面粗糙度。观察到这些表面的润湿去湿过渡。这是从分子模拟中观察到的第一个帐户之一，其中亲水表面通过改变其粗糙度转化为疏水表面。也改变了不确定性的程度，以获得更有见地的观察。通过计算水-水和水-表面能量分量的贡献，分析了润湿到去湿转变的能量。已经建立了能量和润湿到去湿转变之间的相关性，这合理地解释了所观察到的亲水表面的疏水性作为粗糙度的函数。
Wetting behavior of model rough surfaces made of hydrophilic square pillars is investigated. The hydrophilic pillars are equally spaced on hydrophilic surface. The surface roughnesses are altered by varying the pillar width and interpillar spacing. Wetting to dewetting transition is observed for these surfaces. This is one of the first accounts of observation from molecular simulations where hydrophilic surface converts into hydrophobic by changing its roughness. The extent of hydrophilicities are also changed to gain more insightful observations. Energies of the wetting to dewetting transitions are analyzed by calculating the contribution from water–water and water–surface energy components. A correlation between energy and the wetting to dewetting transition has been established, which rationally explains the observed water repellent nature of hydrophilic surface as a function of roughness.