单轴拉伸下石墨烷中的机械力化学反应
Mechanochemical reaction in graphane under uniaxial tension
摘要：
采用量子力学化学反应坐标模拟方法研究了氢功能化石墨烯的力学性能。模拟揭示了原子匹配的特点，伴随着身体发生的变形-失效-破裂过程。与等碳核（5，5）纳米石墨烯和纳米石墨烷片相关的变形特性的比较研究显示出两个主体的高刚度，其分别由相关的六边形单元（即苯型和环己烷型）提供。这两个单元的特征在于在拉伸下沿机械化学内坐标的微观行为的各向异性，当后者是沿（zg）或正常（ach）的C-C键链取向。单元特征与它们相对于体C-C键链的不同堆积构型相结合形成了Zg和ach变形模式不同的结构敏感力学行为的基础。石墨烯的氢化极大地影响了主体的行为和数值特性，使得石墨烯失效的三角形样图案不太明显，并将其从zg模式反转为ach模式，以及总的来说提供了更小的石墨烷机械阻力。
英文摘要：
The quantum-mechanochemical-reaction-coordinate simulations have been performed to investigate the mechanical properties of hydrogen functionalized graphene. The simulations disclosed atomically matched peculiarities that accompany the deformation-failure-rupture process occurred in the body. A comparative study of the deformation peculiarities related to equi-carbon-core (5,5) nanographene and nanographane sheets exhibited a high stiffness of both bodies that is provided by the related hexagon units, namely benzenoid and cyclohexanoid, respectively. The two units are characterized by anisotropy in the microscopic behavior under elongation along mechanochemical internal coordinates when the later are oriented either along (zg) or normally (ach) to the C-C bonds chain. The unit feature in combination with different configuration of their packing with respect to the body C-C bond chains forms the ground for the structure-sensitive mechanical behavior that is different for zg and ach deformation modes. Hydrogenation of graphene drastically influences behavior and numerical characteristics of the body making tricotage-like pattern of the graphene failure less pronounced and inverting it from the zg to ach mode as well as providing less mechanical resistance of graphane it total.
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