Abstract
We investigate the phase-transition behaviour of nickel nanoparticles (3–6 nm) via dynamic TEM. The nanoparticles were synthesized within a reverse microemulsion and then monitored via dynamic TEM simultaneously while undergoing controlled heating. The size-dependent melting point depression experimentally observed is compared with, and is in good agreement with existing thermodynamic and molecular dynamic predictions.
Highlights
Metal and metal oxide nanoparticles exhibit uniquely sizedependent properties which normally follow an inverse surface area to volume proportionality.[1]
We apply a similar method as Zhang et al in order to measure individual nanoparticles by direct observation of nanoparticles via TEM recognising record melting as an abrupt increase in observed diameter.[13]
In this study we have synthesized nickel nanoparticles of varying diameter via a reverse microemulsion synthesis and for the rst time we report experimental studies which complement and validate previous modelling of nickel nanoparticle melting point depression
Summary
Metal and metal oxide nanoparticles exhibit uniquely sizedependent properties which normally follow an inverse surface area to volume proportionality.[1]. Cooling coupled to a JEOL-2100F TEM, we recorded the melting point of eight different nickel nanoparticles over a temperature range of 700–1100 C at a rate of 5 C minÀ1.
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