This paper investigates the effects of interparticle distance and heating rate on the aggregation characteristics of Cu/Au nanoparticles using molecular dynamics (MD) simulations, and focuses on discussing the effects of the two above-mentioned factors on the entire system. Our results suggested that the reduction in heating rate and increasing the initial distance of the particles would both contribute to raising the initial sintering temperature. However, when the particles’ initial distance was greater than the cut-off radius of the system, the initial sintering temperature was not increased any longer, but fluctuated within a certain range. Furthermore, the sintering force of the nanoparticles at the initial sintering temperature was investigated, and it was found that the heating rate made no obvious difference to it. Nonetheless, the sintering force varied under different initial distance of the particles (at the same heating rate) due to system energy changes.

中文翻译：

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初始距离和加热速率对铜和金纳米粒子聚集的影响：MD 研究

本文利用分子动力学（MD）模拟研究了颗粒间距离和加热速率对Cu/Au纳米颗粒聚集特性的影响，重点讨论了上述两个因素对整个系统的影响。我们的结果表明，加热速率的降低和颗粒初始距离的增加都有助于提高初始烧结温度。但当颗粒初始距离大于系统的截止半径时，初始烧结温度不再升高，而是在一定范围内波动。此外，研究了纳米粒子在初始烧结温度下的烧结力，发现加热速率对其没有明显影响。尽管如此，