Laboratory for physics of surfaces and interfaces, University of Mons, Parc Initialis, Avenue Copernic, MateriaNova, 7000 Mons, Belgium.
Langmuir. 2009 Nov 17;25(22):13034-44. doi: 10.1021/la901125a.
We present new spreading-drop data obtained over four orders of time and apply our new analysis tool G-Dyna to demonstrate the specific range over which the various models of dynamic wetting would seem to apply for our experimental system. We follow the contact angle and radius dynamics of four liquids on the smooth silica surface of silicon wafers or PET from the first milliseconds to several seconds. Analysis of the images allows us to make several hundred contact angle and droplet radius measurements with great accuracy. The G-Dyna software is then used to fit the data to the relevant theory (hydrodynamic, molecular-kinetic theory, Petrov and De Ruijter combined models, and Shikhmurzaev's formula). The distributions, correlations, and average values of the free parameters are analyzed and it is shown that for the systems studied even with very good data and a robust fitting procedure, it may be difficult to make reliable claims as to the model which best describes results for a given system. This conclusions also suggests that claims based on smaller data sets and less stringent fitting procedures should be treated with caution.
我们呈现了新的扩展液滴数据，这些数据跨越了四个时间量级，并应用我们的新分析工具 G-Dyna 来展示各种动态润湿模型在我们的实验系统中适用的具体范围。我们跟踪了四种液体在硅片或 PET 的光滑硅表面上的接触角和半径动力学，从最初的几毫秒到几秒钟。通过对图像进行分析，我们可以非常精确地进行数百次接触角和液滴半径测量。然后，使用 G-Dyna 软件将数据拟合到相关理论（流体动力学、分子动力学理论、Petrov 和 De Ruijter 综合模型以及 Shikhmurzaev 公式）。分析了自由参数的分布、相关性和平均值，并表明对于所研究的系统，即使具有非常好的数据和稳健的拟合程序，也可能难以对最佳描述给定系统结果的模型做出可靠的断言。这一结论还表明，基于较小数据集和较少严格拟合程序的断言应谨慎对待。
