Rolley E, Guthmann C
Laboratoire de Physique Statistique de l'ENS, associé au CNRS et aux Universités Paris 6 et Paris 7, 24 rue Lhomond, 75005 Paris, France.
Phys Rev Lett. 2007 Apr 20;98(16):166105. doi: 10.1103/PhysRevLett.98.166105.
We have measured both the hysteresis and the dynamics of the edge of a liquid hydrogen meniscus on several solid cesium substrates. We find that the dynamics of the contact line is thermally activated. For all substrates, we find that the activation energy is of the order of the hysteresis. We show that the pinning of the contact line on mesoscopic defects of the Cs substrate is likely to control both the hysteresis and the dynamics of the contact line at low velocity, close to the depinning threshold. Such a mechanism could be relevant also for simple room-temperature systems.
我们已经在几种固态铯衬底上测量了液氢弯月面边缘的滞后现象和动力学。我们发现接触线的动力学是热激活的。对于所有衬底，我们发现激活能与滞后现象的量级相当。我们表明，在低速且接近脱钉阈值时，接触线在铯衬底介观缺陷上的钉扎可能控制着接触线的滞后现象和动力学。这种机制可能也适用于简单的室温系统。
