Nanocompression of secondary particles of silica aerogel

William Gonçalves (1) , Jonathan Amodeo (1) , Julien Morthomas (1) , Patrice Chantrenne (1) , Michel Perez (1) , Genevieve Foray (1) , Christophe Martin (2)

1 MATEIS - Matériaux, ingénierie et science [Villeurbanne]
2 SIMaP - Science et Ingénierie des Matériaux et Procédés

The compression of highly porous silica nanospheres is investigated using molecular dynamics simulations and modeling. The ligaments network (3-6 nm) of nano-sized silica sustains the load and nanoparticles deform plastically due to highly localized shear events, at the junctions between ligaments. Dangling ligaments are more numerous as the size of the nanosphere decreases, thus impacting the mechanical response. Based on simulation results, we propose a scaling law that describes the particle size effect on the indentation force when applied to silica aerogel secondary nanoparticles under compression.

Mots clés: multi-scale model; silica aerogel; nanocompression; Molecular Dynamics

Domaines: Matériaux

William Gonçalves, Jonathan Amodeo, Julien Morthomas, Patrice Chantrenne, Michel Perez, et al.. Nanocompression of secondary particles of silica aerogel. Scripta Materialia, 2018, 157, pp.157-161. ⟨10.1016/j.scriptamat.2018.07.039⟩. ⟨hal-01866434⟩