Abstract
The problem of nano-particles (NPs) stability is related to negative consequences due to quality deterioration and energetically conditioned.In this paper we model thermodynamic characteristics of a metal NP ensemble. The problem of changes in thermodynamic potentials (TPs) of an NP-ensemble is formulated and estimatively solved. This comprises two sub-problems, i.e. a surface tension related TP-increase and vacancy-related TP-decrease.Nano-ensembles with In and Au particles are considered. A TP specific increase due to surface tension reaches 3.1·10−5 J/mole (In) and 3.9·10−5 J/mole (Au) at 300 K, the specific vacancy-related decrease constitutes 3.4·105 J/mole (In) and 7.2·1015 J/mole (Au).The vacancy-related effect dominates provided the ensembles comprised extremely small NPs (<10 nm in size). Should extra small NPs be excluded, the surface tension effect takes over the predominance. The nano-systems thermodynamic instability can be minimized through balancing both effects. The results obtained may help prognosticate stability of artificially generated nano-ensembles.
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