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The formation of a new phase in nanoparticles

Vladimir P. Zhdanov (Institutionen för teknisk fysik, Kemisk fysik ; Kompetenscentrum katalys (KCK)) ; Bengt Kasemo (Institutionen för teknisk fysik, Kemisk fysik ; Kompetenscentrum katalys (KCK))
Physica E- Low-dimensional systems & nanostructures (1386-9477). Vol. 41 (2009), 5, p. 775-778.
[Artikel, refereegranskad vetenskaplig]

First-order phase transitions in nanoparticles (e.g., metal hydride formation) occur via absorption of species from or release to the gas Or liquid phase. If the lattice strain is negligible, the uptake corresponding to a new phase exhibits a stepwise rise or drop with increasing or decreasing pressure or chemical potential of the absorbed species. With decreasing nanoparticle size, L, and increasing role of the surface and subsurface layers, this feature becomes less manifested because the system is less ideal. We present 3D lattice Monte Carlo simulations, explicitly illustrating this effect for L in the range from 100 down to 10 (L is measured in units of lattice spacing).

Nyckelord: Supported metal nanoparticles; First-order phase transitions; Chemical potential; Hysteresis; Hydride formation



Denna post skapades 2009-10-13. Senast ändrad 2013-10-29.
CPL Pubid: 100090

 

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Institutioner (Chalmers)

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

Ämnesområden

Kemisk fysik

Chalmers infrastruktur