Molecular dynamics simulations of nanoparticle-surface collisions in crystalline silicon

Paolo Valentini, Traian Dumitrica

Research output: Contribution to journalArticlepeer-review

6 Scopus citations


We present a microscopic description for the impacting process of silicon nanospheres onto a silicon substrate. In spite of the relatively low energy regime considered (up to 1 eV/atom), the impacting process exhibits a rich behavior: A rigid Hertzian model is valid for speeds below 500 m/s, while a quasi-ellipsoidal deformation regime emerges at larger speeds. Furthermore, for speeds up to 1000 m/s the particle undergoes a soft landing and creates a long-lived coherent surface phonon. Higher speeds lead to a rapid attenuation of the coherent phonon due to a partial diamond cubic to β-tin phase transformation occurring in the particle.

Original languageEnglish (US)
Pages (from-to)30-39
Number of pages10
JournalJournal of Nano Research
Issue number1
StatePublished - 2008


  • Impact
  • Molecular dynamics
  • Nanoparticle
  • Silicon


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