An apparent contact angle is formed when a droplet is deposited on a solid substrate. Young’s law has been employed to describe the equilibrium contact angle. Often in experiments, the equilibrium contact angle deviates from Young’s law and depends on the volume of the droplet, known as the line tension effect. However, the physical origin of the line tension is quite controversial. Especially, the sign and the quantity of the line tension spanning 6 orders of magnitude are unsolved problems. Here, we quantify the line energy in terms of physical parameters and demonstrate that both positive and negative line tensions exist. The results are quantitatively compared with existing experiments as well as with previous theories. Published by the American Physical Society 2024

中文翻译：

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润湿现象：线张力和引力效应


当液滴沉积在固体基板上时，会形成明显的接触角。杨氏定律已被用于描述平衡接触角。在实验中，平衡接触角通常偏离杨氏定律，取决于液滴的体积，称为线张力效应。然而，线张力的物理起源是相当有争议的。特别是，跨越 6 个数量级的线张力的符号和数量是未解决的问题。在这里，我们根据物理参数量化了线能量，并证明了正和负线张力都存在。将结果与现有实验以及以前的理论进行定量比较。 美国物理学会 2024 年出版