High frictional anisotropy of periodic and aperiodic directions on a quasicrystal surface
High frictional anisotropy of periodic and aperiodic directions on a quasicrystal surface
复制标题
DOI：
10.1126/science.1113239
复制
发表时间：
2005-08-26
期刊：
影响因子：
56.9
通讯作者：
Thiel, PA
中科院分区：
文献类型：
--
作者：
Park, JY;Ogletree, DF;Thiel, PA
强摩擦各向异性被发现时，一个原子级清洁的铝镍钴准晶的双重表面对硫醇钝化氮化钛尖滑动。沿着非周期方向的摩擦力是沿沿着周期方向的摩擦力的八分之一。这种各向异性，这是在各向异性晶体表面中观察到的最高值的约三倍大，消失后的表面在空气中氧化。这些结果揭示了界面原子结构和能量耗散机制之间的密切联系，这些机制可能包括电子或声子贡献，或两者兼而有之。
Strong friction anisotropy is found when the twofold surface of an atomically clean aluminum-nickel-cobalt quasicrystal slides against a thiol-passivated titanium-nitride tip. Friction along the aperiodic direction is one-eighth as much as that along the periodic direction. This anisotropy, which is about three times as large as the highest value observed in anisotropic crystalline surfaces, disappears after the surface is oxidized in air. These results reveal a strong connection between interface atomic structure and the mechanisms by which energy is dissipated, which likely include electronic or phononic contributions, or both.