On the mechanism of the shape elongation of embedded nanoparticles
作者： H. Amekura , P. Kluth , P. Mota-Santiago , I. Sahlberg , V. Jantunen
DOI: 10.1016/J.NIMB.2020.04.038
关键词: Chemical physics 、 Molecular dynamics 、 Materials science 、 Irradiation 、 Nanoparticle 、 Elongation 、 Ion 、 Swift heavy ion 、 Electron 、 Deformation (engineering)
摘要: Abstract The mechanism of the shape elongation metal nanoparticles (NPs) in silica, which is induced under swift heavy ion irradiation, discussed with comparing two candidates: (i) synergy between hammering and transient melting NPs by inelastic thermal spike (ii) pressure flow model. We show that three experimental results are inconsistent (i). latter supported two-temperature molecular dynamics simulations, simulate not only atomic motions but also local electron temperatures. A remarkable correlation was observed temporal evolution silica density around trajectory aspect ratio NP later than ~ 1 ps after impact, while no earlier than ~ 1 ps, even assumption instantaneous energy deposition.
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