Nanocompression of secondary particles of silica aerogel

SCRIPTA MATERIALIA

卷:157

Article

Goncalves, William^1,2  Amodeo, Jonathan¹  Morthomas, Julien¹  Chantrenne, Patrice¹  Perez, Michel¹  Foray, Genevieve¹  Martin, Christophe L.² 

[1] Univ Lyon, INSA Lyon, UCBL, CNRS,MATEIS, 7 Ave Jean Capelle, F-69621 Villeurbanne, France

[2] Univ Grenoble Alpes, CNRS, SIMAP, F-38000 Grenoble, France

关键词: Molecular dynamics;    Silica aerogel;    Multi-scale model;    Nanocompression;   

DOI  :  10.1016/j.scriptamat.2018.07.039

来源: Elsevier

【 摘 要 】

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. (C) 2018 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

【 授权许可】

Free