Negative normal restitution coefficient found in simulation of nanocluster collisions.
Negative normal restitution coefficient found in simulation of nanocluster collisions.
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DOI：
10.1103/physrevlett.105.238001
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发表时间：
2010-05
影响因子：
8.6
通讯作者：
Kuniyasu Saitoh;A. Bodrova;H. Hayakawa;N. Brilliantov
中科院分区：
文献类型：
--
作者：
Kuniyasu Saitoh;A. Bodrova;H. Hayakawa;N. Brilliantov
从理论上和分子动力学方法研究了纳米团簇的斜碰撞。在模拟中，我们探索了两种模型-Lennard-Jones团簇和具有共价键原子的粒子。与宏观体的情况下，正常的恢复系数的标准定义产生此系数负值的斜碰撞的纳米团簇。我们解释了这种效果，并提出了一个适当的定义的恢复系数，它总是积极的。我们发展了一个理论的基础上的连续体模型的粒子的斜碰撞。宏观理论和模拟之间令人惊讶的良好协议导致的结论是，弹性，体积粘度和表面张力的宏观概念仍然有效的纳米粒子的几百个原子。
The oblique impacts of nanoclusters are studied theoretically and by means of molecular dynamics. In simulations we explore two models--Lennard-Jones clusters and particles with covalently bonded atoms. In contrast with the case of macroscopic bodies, the standard definition of the normal restitution coefficient yields for this coefficient negative values for oblique collisions of nanoclusters. We explain this effect and propose a proper definition of the restitution coefficient which is always positive. We develop a theory of an oblique impact based on a continuum model of particles. A surprisingly good agreement between the macroscopic theory and simulations leads to the conclusion that macroscopic concepts of elasticity, bulk viscosity, and surface tension remain valid for nanoparticles of a few hundred atoms.