Evolution of structure of SiO2 nanoparticles upon cooling from the melt

Details Evolution of structure of SiO2 nanoparticles upon cooling from the melt Evolution of structure of SiO2 nanoparticles upon cooling from the melt

2009-01-14

arxiv.org/abs/0901.2029v2

PMC Physics B 2008, 1:16

Physics

Condensed Matter

Materials Science

12 pages, 6 figures

Scientific paper

10.1186/1754-0429-1-16

Evolution of structure of spherical SiO2 nanoparticles upon cooling from the melt has been investigated via molecular-dynamics (MD) simulations under non-periodic boundary conditions (NPBC). We use the pair interatomic potentials which have weak Coulomb interaction and Morse type short-range interaction. The change in structure of SiO2 nanoparticles upon cooling process has been studied through the partial radial distribution functions (PRDFs), coordination number and bond-angle distributions at different temperatures. The core and surface structures of nanoparticles have been studied in details. Our results show significant temperature dependence of structure of nanoparticles. Moreover, temperature dependence of concentration of structural defects in nanoparticles upon cooling from the melt toward glassy state has been found and discussed.

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