Molecular dynamics simulation of ballistic effects in mesoporous silica

Yu Lou, Bertrand Siboulet, Sandrine Dourdain, Mohamed Ruwaid Rafiuddin, Xavier Deschanels, Jean Marc Delaye

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1 Citation (Scopus)

Abstract

Accumulation of ion displacement cascades in mesoporous silica material have been modeled using molecular dynamics (MD). For nuclear energies exceeding 30 keV/nm3, the volume and structural properties (Si-O-Si bond angle, coordination of O and Si) of the mesoporous silica material are modified thereby resulting in the complete collapse of the structure. Similar results were obtained from Au+ ion-irradiation (E = 0.5 MeV) experiments on mesoporous silica samples in which the density of the samples was shown to increase upon irradiation before saturating at deposited nuclear energies exceeding 30 keV/nm3. Both ion-irradiation experiments and MD simulations have shown that the ballistic effects are responsible for inducing densification of the mesoporous silica material. The mechanism underlying this densification is discussed in terms of irradiation induced sintering.

Original languageEnglish
Article number120346
Number of pages11
JournalJournal of Non-Crystalline Solids
Volume549
Early online date11 Aug 2020
DOIs
Publication statusPublished - 1 Dec 2020
Externally publishedYes

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