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Overheating and undercooling during melting and crystallization of metal nanoparticles

Vladimir P. Zhdanov (Institutionen för teknisk fysik, Kemisk fysik ; Kompetenscentrum katalys (KCK)) ; Markus Schwind (Institutionen för teknisk fysik, Kemisk fysik) ; Igor Zoric (Institutionen för teknisk fysik, Kemisk fysik) ; Bengt Kasemo (Institutionen för teknisk fysik, Kemisk fysik ; Kompetenscentrum katalys (KCK))
Physica. E, Low-Dimensional systems and nanostructures (1386-9477). Vol. 42 (2010), 7, p. 1990-1994.
[Artikel, refereegranskad vetenskaplig]

In analogy with macroscopic metal samples, crystallization of metal nanoparticles may occur appreciably below the thermodynamic melting temperature, Tm (this temperature depends on the particle size), while melting occurs at Tm. If the surface melting is suppressed, nanoparticles can be overheated during melting. We describe these effects by using the classical nucleation theory and assuming that the nucleation starts at the particle corners or edges. The corresponding undercooling or overheating temperature intervals are found to be about 0.1Tm for corners and 0.15Tm for edges. These values are, respectively, two and one and a half times smaller than that for macroscopic samples. Under certain conditions, crystallization and melting can be controlled by the propagation of the front of a new phase. The corresponding temperature interval is found to be very narrow (about 0.02Tm).

Nyckelord: Metal nanoparticles; first-order phase transitions; melting; crystallization; classical nucleation theory; interfacial tension; lattice strain



Denna post skapades 2010-03-10. Senast ändrad 2017-08-18.
CPL Pubid: 117638

 

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Institutioner (Chalmers)

Institutionen för teknisk fysik, Kemisk fysik (1900-2015)
Kompetenscentrum katalys (KCK)

Ämnesområden

Kemisk fysik

Chalmers infrastruktur