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Related Experiment Videos

Superheating and solid-liquid phase coexistence in nanoparticles with nonmelting surfaces.

D Schebarchov1, S C Hendy

  • 1School of Chemical and Physical Sciences, Victoria University of Wellington, Wellington 6001, New Zealand.

Physical Review Letters
|August 16, 2006
PubMed
Summary

Melting point of nanoparticles can increase beyond bulk levels when solid-liquid interfaces are partially wet. This phenomenon, observed in aluminum nanoparticles, indicates a first-order transition during melting onset.

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Area of Science:

  • Materials Science
  • Physical Chemistry
  • Nanotechnology

Background:

  • Melting behavior in nanoparticles differs from bulk materials due to surface effects.
  • Partial wetting of nanoparticle facets by the liquid phase introduces unique interfacial phenomena.

Purpose of the Study:

  • To develop a phenomenological model for nanoparticle melting under partial wetting conditions.
  • To investigate the impact of partial wetting on melting temperature and phase transitions.

Main Methods:

  • Development of a phenomenological model describing melting in nanoparticles with partially wet facets.
  • Comparison of model predictions with results from molecular dynamics simulations.

Main Results:

  • The model predicts that the microcanonical melting temperature can exceed the bulk melting point.

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  • The onset of solid-liquid coexistence is identified as a first-order phase transition.
  • Molecular dynamics simulations of aluminum nanoparticles confirm the phenomenon, showing them remaining solid above the bulk melting temperature.

    • Conclusions:

    • Partial wetting significantly influences nanoparticle melting behavior.
    • Nanoparticles can exhibit enhanced melting points compared to their bulk counterparts.
    • The findings have implications for understanding phase transitions in nanomaterials.