Determination of Surface Tension and Contact Angle from the Shapes of Axisymmetric Fluid Interfaces without Use of Apex Coordinates
Determination of Surface Tension and Contact Angle from the Shapes of Axisymmetric Fluid Interfaces without Use of Apex Coordinates
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DOI：
10.1021/la061928t
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发表时间：
2006-11
期刊：
影响因子：
3.9
通讯作者：
M. G. Cabezas;A. Bateni;J. Montanero;A. Neumann
中科院分区：
文献类型：
--
作者：
M. G. Cabezas;A. Bateni;J. Montanero;A. Neumann
液滴形状技术，如轴对称液滴形状分析，被广泛用于测量表面特性，因为它们是准确和可靠的。然而，它们不适用于处理不存在顶点的流体构型的实验研究。提出了一种新的方法来测量液体的界面性质，如表面张力和接触角，通过分析的轴对称液体-流体界面的形状，而不使用顶点坐标。界面的理论形状是作为界面起点处的表面张力和一些几何参数的函数而数值生成的，例如，接触角和界面半径。然后，以界面性质为可调参数，将数值形状与实验轮廓进行拟合。最佳拟合确定了表面张力和接触角的真实值。使用理论图像拟合分析（TIFA）策略进行实验和理论配置文件之间的比较。TIFA-AI方法适用于任何轴对称实验构型（有或无顶点）。TIFA-AI的多功能性和准确性通过考虑各种配置来显示：液体桥，固着和悬垂液滴，以及液体透镜。
Drop shape techniques, such as axisymmetric drop shape analysis, are widely used to measure surface properties, as they are accurate and reliable. Nevertheless, they are not applicable in experimental studies dealing with fluid configurations that do not present an apex. A new methodology is presented for measuring interfacial properties of liquids, such as surface tension and contact angles, by analyzing the shape of an axisymmetric liquid-fluid interface without use of apex coordinates. The theoretical shape of the interface is generated numerically as a function of surface tension and some geometrical parameters at the starting point of the interface, e.g., contact angle and radius of the interface. Then, the numerical shape is fitted to the experimental profile, taking the interfacial properties as adjustable parameters. The best fit identifies the true values of surface tension and contact angle. Comparison between the experimental and the theoretical profiles is performed using the theoretical image fitting analysis (TIFA) strategy. The new method, TIFA-axisymmetric interfaces (TIFA-AI), is applicable to any axisymmetric experimental configuration (with or without apex). The versatility and accuracy of TIFA-AI is shown by considering various configurations: liquid bridges, sessile and pendant drops, and liquid lenses.