Wang Chunlei, Yang Haijun, Wang Xian, Qi Chonghai, Qu Mengyang, Sheng Nan, Wan Rongzheng, Tu Yusong, Shi Guosheng
Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai, 201800, China.
Shanghai Advanced Research Institute, Chinese Academy of Sciences, Shanghai, 201210, China.
Commun Chem. 2020 Feb 27;3(1):27. doi: 10.1038/s42004-020-0271-8.
Generally, the interface friction on solid surfaces is regarded as consistent with wetting behaviors, characterized by the contact angles. Here using molecular dynamics simulations, we find that even a small charge difference (≤0.36 e) causes a change in the friction coefficient of over an order of magnitude on two-dimensional material and lipid surfaces, despite similar contact angles. This large difference is confirmed by experimentally measuring interfacial friction of graphite and MoS contacting on water, using atomic force microscopy. The large variation in the friction coefficient is attributed to the different fluctuations of localized potential energy under inhomogeneous charge distribution. Our results help to understand the dynamics of two-dimensional materials and biomolecules, generally formed by atoms with small charge, including nanomaterials, such as nitrogen-doped graphene, hydrogen-terminated graphene, or MoS, and molecular transport through cell membranes.
一般来说，固体表面的界面摩擦被认为与润湿行为一致，以接触角为特征。在这里，通过分子动力学模拟，我们发现即使是很小的电荷差（≤0.36 e）也会导致二维材料和脂质表面的摩擦系数发生一个数量级以上的变化，尽管接触角相似。通过使用原子力显微镜实验测量石墨和MoS在水上接触的界面摩擦，证实了这种巨大差异。摩擦系数的巨大变化归因于非均匀电荷分布下局部势能的不同波动。我们的结果有助于理解二维材料和生物分子的动力学，这些通常由带小电荷的原子形成，包括纳米材料，如氮掺杂石墨烯、氢终止石墨烯或MoS，以及分子通过细胞膜的传输。
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