College of Engineering & Applied Science, University of Wisconsin-Milwaukee, Milwaukee, Wisconsin 53211, USA.
ACS Nano. 2012 Oct 23;6(10):8488-91. doi: 10.1021/nn302138r. Epub 2012 Sep 25.
We discuss mechanical forces that act upon a water droplet and a piece of ice on a rough solid surface and the difference between dewetting and ice fracture. The force needed to detach a water droplet depends on contact angle (CA) hysteresis and can be reduced significantly in the case of a superhydrophobic surface. The force needed to detach a piece of ice depends on the receding CA and the initial size of interfacial cracks. Therefore, even surfaces with very high receding CA may have strong adhesion to ice if the size of the cracks is small.
我们讨论了作用在粗糙固体表面上的水滴和冰块上的机械力，以及脱湿和冰破裂之间的区别。分离水滴所需的力取决于接触角滞后，在超疏水表面的情况下可以显著降低。分离冰块所需的力取决于后退接触角和界面裂缝的初始大小。因此，即使是后退接触角非常高的表面，如果裂缝尺寸小，也可能与冰具有很强的附着力。
