The effect of salt on the melting of ice: A molecular dynamics simulation study
J. Chem. Phys. 129, 124504 (2008); doi:10.1063/1.2979247
Published 25 September 2008
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The effect of added salt (NaCl) on the melting of ice is studied using molecular dynamics simulations. The equilibrium freezing point depression observed in the simulations is in good agreement with experimental data. The kinetic aspects of melting are investigated in terms of the exchange of water molecules between ice and the liquid phase. The ice/liquid equilibrium is a highly dynamic process with frequent exchange of water molecules between ice and the liquid phase. The balance is disturbed when ice melts and the melting proceeds in two stages; the inhibition of the association of water molecules to the ice surface at short times, followed by the increased dissociation of water molecules from the ice surface at longer times. We also find that Cl− ions penetrate more deeply into the interfacial region than Na+ ions during melting. This study provides an understanding of the kinetic aspects of melting that could be useful in other processes such as the inhibition of ice growth by antifreeze proteins.
©2008 American Institute of Physics
| History: | Received 9 June 2008; accepted 15 August 2008; published 25 September 2008 |
| Permalink: |
http://link.aip.org/link/?JCPSA6/129/124504/1 |
KEYWORDS and PACS
association,
crystal growth,
dissociation,
freezing,
ice,
melting,
molecular dynamics method,
proteins,
sodium compounds,
surface chemistry,
water
- 64.70.dj
Melting of specific substances - 82.30.Nr
Association, addition, insertion, cluster formation (chemical reactions) - 82.65.+r
Surface and interface chemistry; heterogeneous catalysis at surfaces - 82.30.Lp
Decomposition chemical reactions (pyrolysis, dissociation, and fragmentation) - 61.20.Ja
Computer simulation of liquid structure - YEAR: 2008
RELATED DATABASES
PUBLICATION DATA
0021-9606 (print)
1089-7690 (online)
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