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首页> 外文期刊>Journal of Physics, D. Applied Physics: A Europhysics Journal >Impact of atomic-scale surface morphology on the size-dependent yield stress of gold nanoparticles
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Impact of atomic-scale surface morphology on the size-dependent yield stress of gold nanoparticles

机译:原子尺度表面形态对金纳米颗粒尺寸屈服应力的影响

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摘要

Size-dependent mechanical properties have been revealed for nanowires, nanopillars and nanoparticles. On the surfaces of these nanosized elements, discrete atomic-scale steps will be naturally generated, however their impact on the mechanical properties and deformation has seldom been a concern. In this paper, large-scale molecular dynamics simulations are conducted to calculate the yield stress of gold nanoparticles under compression. In addition to absolute particle size, atomic-scale surface morphology induces significant fluctuation of the yield stress. An analytical relation is advanced to predict the yield stress of nanoparticles accounting for the influence of both size and surface morphology, which agrees well with atomic simulations. This study illuminates an important mechanism in nanosized elements, atomic-scale surface steps.
机译:纳米线,纳米粒子和纳米颗粒揭示了依赖性机械性能。 在这些纳米化元件的表面上,自然产生离散的原子级步骤,但它们对机械性能和变形的影响很少是一个问题。 本文进行了大规模分子动力学模拟,以计算压缩下金纳米颗粒的屈服应力。 除了绝对粒径之外,原子级表面形态学诱导屈服应力的显着波动。 对分析关系进行了前进,以预测纳米粒子占尺寸和表面形态的影响的屈服应力,这与原子模拟很好。 本研究阐明了纳米型元素,原子尺度表面步骤的重要机制。

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