An experimental physicist who coauthored measurements of size-dependent melting in gold nanoparticles with J-P. Borel. The experiment used electron diffraction on particles down to about two nanometers in diameter and compared the results with alternative thermodynamic models. It made the importance of surfaces directly measurable: a small particle need not melt at the bulk material's temperature.[ref]
Size effect on the melting temperature of gold particles by Ph. Buffat and J-P. Borel. Abstract: minimum size, diffraction method and comparison of two equilibrium models
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