方冰如何帮助润滑
How square ice helps lubrication
摘要：
在摩擦的背景下，我们使用原子分子动力学模拟，以调查在很宽的压力范围内的石墨烯片之间的水限制。我们发现，承压水的热平衡在高压下受阻。我们证明，在适当的条件下，方形冰可以在粗糙体中形成，并且它类似于立方冰VII和冰X。我们模拟滑动的原子平面石墨的方冰，并发现由于结构超润滑性极低的摩擦。方冰形成所需的条件对应于低滑动速度，我们认为在湿石墨上的摩擦实验中观察到的冰就是这种类型。
英文摘要：
In the context of friction we use atomistic molecular-dynamics simulations to investigate water confined between graphene sheets over a wide range of pressures. We find that thermal equilibration of the confined water is hindered at high pressures. We demonstrate that, under the right conditions, square ice can form in an asperity, and that it is similar to cubic ice VII and ice X. We simulate sliding of atomically flat graphite on the square ice and find extremely low friction due to structural superlubricity. The conditions needed for square ice to form correspond to low sliding speeds, and we suggest that the ice observed in experiments of friction on wet graphite is of this type.
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