Superheating and solid-liquid phase coexistence in nanoparticles with non-melting surfaces

Abstract

We present a phenomenological model of melting in nanoparticles with facets that are only partially wet by their liquid phase. We show that in this model, as the solid nanoparticle seeks to avoid coexistence with the liquid, the microcanonical melting temperature can exceed the bulk melting point, and that the onset of coexistence is a first-order transition. We show that these results are consistent with molecular dynamics simulations of aluminum nanoparticles which remain solid above the bulk melting temperature.

8 pages, 5 figures

References in corpus (9)

• Interatomic potentials from first-principles calculations: the force-matching method
• Melting and nonmelting of solid surfaces and nanosystems
• Coalescence of nanoscale metal clusters: Molecular-dynamics study
• Melting a copper cluster: Critical droplet theory
• Melting of aluminium clusters
• Solid-liquid phase coexistence and structural transitions in palladium clusters
• Maximum Overheating and Partial Wetting of Nonmelting Solid Surfaces
• Size--sensitive melting characteristics of gallium clusters: Comparison of Experiment and Theory for Ga${}_{17}{}^{+}$ and Ga${}_{20}{}^{+}$
• Stability of Phase Coexistence in Atomic Clusters

Cited by in corpus (1)

• A thermodynamic model for the melting of supported metal nanoparticles