Makkonen Lasse
Technical Research Centre of Finland, Espoo, 02044 VTT, Finland.
J Phys Condens Matter. 2016 Apr 6;28(13):135001. doi: 10.1088/0953-8984/28/13/135001. Epub 2016 Mar 4.
Young's construction for a contact angle at a three-phase intersection forms the basis of all fields of science that involve wetting and capillary action. We find compelling evidence from recent experimental results on the deformation of a soft solid at the contact line, and displacement of an elastic wire immersed in a liquid, that Young's equation can only be interpreted by surface energies, and not as a balance of surface tensions. It follows that the a priori variable in finding equilibrium is not the position of the contact line, but the contact angle. This finding provides the explanation for the pinning of a contact line.
杨氏三相交点接触角的构造构成了所有涉及润湿和毛细作用的科学领域的基础。我们从最近关于接触线处软固体变形以及浸入液体中的弹性丝位移的实验结果中发现了令人信服的证据，即杨氏方程只能用表面能来解释，而不能看作是表面张力的平衡。由此可见，在寻找平衡时，先验变量不是接触线的位置，而是接触角。这一发现为接触线的钉扎现象提供了解释。
