Open AccessSize dependence of the melting temperature and mechanisms of the coalescence/sintering on the nanoscale
Author(s) -
V. M. Samsonov,
М. И. Алымов,
I. V. Talyzin,
S. A. Vasilyev
Publication year - 2019
Publication title -
journal of physics. conference series
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.21
H-Index - 85
eISSN - 1742-6596
pISSN - 1742-6588
DOI - 10.1088/1742-6596/1352/1/012044
Subject(s) - sintering , coalescence (physics) , nanoscopic scale , materials science , molecular dynamics , nanoparticle , melting temperature , melting point , chemical physics , nanotechnology , thermodynamics , composite material , chemistry , computational chemistry , physics , astrobiology
We have proposed to use the nanoparticle (NP) melting temperature T m to distinguish between the coalescence and sintering processes on the nanoscale. According to our molecular dynamics results, obtained on Au NPs, the coalescence of nanoproplets may be interpreted as a hydrodynamic phenomenon on the nanoscale, and the characteristic coalescence time τ is a linear function of the initial particle radius r 0 . In turn, the sintering of two crystalline NPs ( T < T m ) relates to a grain boundary formation as a result of an alignment of the crystallographic orientations of the sintering NPs, and in this case a dependence of τ on r 0 has not been revealed.