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首页> 外文期刊>Physica, A. Statistical mechanics and its applications >Surface roughness analysis of hydrophilic SiO_2/TiO _2/glass nano bilayers by the level crossing approach
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Surface roughness analysis of hydrophilic SiO_2/TiO _2/glass nano bilayers by the level crossing approach

机译：水平交联法分析亲水性SiO_2 / TiO_2 /玻璃纳米双层的表面粗糙度

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摘要

The effect of etching time on the statistical properties of hydrophilic surfaces of SiO_2/TiO_2/glass nano bilayers has been studied using atomic force microscopy (AFM) and a stochastic approach based on a level crossing analysis. We have created rough surfaces of the hydrophilic SiO _2/TiO_2 nano bilayer system by using 26% potassium hydroxide (KOH) solution. Measuring the average apparent contact angle allowed us to assess the degree of hydrophilicity, and the optimum condition was determined to be 10 min etching time. A level crossing analysis based on AFM images provided deeper insight into the microscopic details of the surface topography. With different etching times, it has been shown that the average frequency of visiting a height with positive slope behaves in a Gaussian manner for heights near the mean value and obeys a power law for heights far away from the mean value. Finally, by applying the generalized total number of crossings with positive slope, it was found that the both high heights and deep valleys of the surface have a great effect on the hydrophilic degree of the SiO _2/TiO_2/glass nano bilayer investigated system.
机译：利用原子力显微镜（AFM）和基于能级交叉分析的随机方法研究了刻蚀时间对SiO_2 / TiO_2 /玻璃纳米双层亲水表面统计特性的影响。我们通过使用26％的氢氧化钾（KOH）溶液创建了亲水性SiO _2 / TiO_2纳米双层系统的粗糙表面。测量平均表观接触角使我们能够评估亲水性程度，并且确定最佳条件为10分钟蚀刻时间。基于AFM图像的平交路口分析提供了对表面形貌微观细节的更深入了解。在不同的蚀刻时间下，已经显示出，对于接近平均值的高度，以正斜率访问高度的平均频率表现为高斯方式，而对于远离平均值的高度，服从幂律。最后，通过采用具有正斜率的广义交叉总数，发现表面的高高和深谷对SiO _2 / TiO_2 /玻璃纳米双层研究体系的亲水度有很大影响。

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