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Extreme undercooling (down to 90 K) of liquid metal nanoparticles

Abstract : Low-melting-point metal nanoparticles show remarkable undercoolings: exceptional values DeltaT/Tm~=0.5 were previously reported for confined Ga droplets in the 100–1000 nm range. This was considered a characteristic limiting temperature for Ga. We here give evidence that Ga nanoparticles in the 3–15 nm range can be undercooled at least down to 90 K (DeltaT/Tm>=0.7) without crystallization. Since computations and experiments on clusters with <50 atoms show on the contrary the signatures of melting at temperatures well above the bulk value, the result is particularly relevant in stressing the importance of interfacial and finite-size effects on the thermodynamics of the nanoscale.
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Submitted on : Monday, February 2, 2009 - 2:42:34 PM
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G. B. Parravicini, A. Stella, P. Ghigna, G. Spinolo, A. Migliori, et al.. Extreme undercooling (down to 90 K) of liquid metal nanoparticles. Applied Physics Letters, American Institute of Physics, 2006, 89 (3), pp.033123. ⟨10.1063/1.2221395⟩. ⟨insu-00357951⟩



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