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International Journal of Energy for a Clean Environment

Published 8 issues per year

ISSN Print: 2150-3621

ISSN Online: 2150-363X

SJR: 0.597 SNIP: 1.456 CiteScore™:: 3.7 H-Index: 18

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ULTRASHORT LASER MELTING OF COPPER NANOPARTICLES: A MOLECULAR DYNAMICS STUDY

Volume 17, Issue 1, 2016, pp. 1-25
DOI: 10.1615/InterJEnerCleanEnv.2015013543
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ABSTRACT

Based on the simulation result of a model that combines two-temperature and molecular dynamic methods and takes both electrons conduction band and atomic-level equilibration procedure between the electrons and the lattice into account, an ultrashort laser mechanism of melting copper nanoparticles has been investigated. To be more precise, the effect of inner defect (grain boundary) on the melting process is considered in this paper. It can be expected that the inner defect has a positive impact on the laser melting because the atoms at defects with higher free energy are comparatively disordered and unsteady compared to those within the perfect lattice. Besides, the size effect is another major concern for nanoparticles on account of their relatively large specific surface area which makes them reactive to the laser pulse. Hence, nanoparticles of two different sizes of10 nm and 20 nm have been created and simulated to study their influence on the kinetics of melting process and on the respective physical and thermal properties with different laser fluences. For monocrystalline nanoparticles at low laser fluence, the surface melting phenomenon is remarkable compared to polycrystalline nanoparticles at both low and high laser fluences. In addition, the size of nanoparticle not only affects the microscopic mechanisms of laser melting, but also plays a dominant role in density decreasing degree and speed.

CITED BY
  1. Hu Yingbin, Ning Fuda, Wang Hui, Cong Weilong, Zhao Bo, Laser engineered net shaping of quasi-continuous network microstructural TiB reinforced titanium matrix bulk composites: Microstructure and wear performance, Optics & Laser Technology, 99, 2018. Crossref

  2. HUANG Xin, DENG Hai-lin, LI Xia-wei, ZHOU Zhi-hong, TIAN Xiao-bao, Laser Ablation Induced Toughness Enhancement in Twin Crystal Copper, 2019 14th Symposium on Piezoelectrcity, Acoustic Waves and Device Applications (SPAWDA), 2019. Crossref

  3. Jiang Fan, Deng Haiin, Wang Hongyu, Chen Yujun, Huang Zhiyong, Tian Xiaobao, Li Qinan, Femtosecond Laser Eliminates Grain Boundary Defects in Copper Film: A Molecular Dynamics Study, 2020 15th Symposium on Piezoelectrcity, Acoustic Waves and Device Applications (SPAWDA), 2021. Crossref

  4. Luo Wenhe, Li Tao, Wang Meng, Dai Wanqin, Jiao Chunlei, Ma Yuhui, Ding Yayun, Yang Fang, He Xiao, Zhang Zhiyong, Nanoparticles Determination by Laser Ablation Inductively Coupled Plasma Mass Spectrometry, Journal of Nanoscience and Nanotechnology, 21, 11, 2021. Crossref

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