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Melting dramatically enhances the reactivity of aluminum nanoclusters.
Melting dramatically enhances the reactivity of aluminum nanoclusters.
- Source :
-
Journal of the American Chemical Society [J Am Chem Soc] 2009 Feb 25; Vol. 131 (7), pp. 2446-7. - Publication Year :
- 2009
-
Abstract
- The kinetic energy threshold for chemisorption of N(2) on Al(100)(+) has been measured as a function of the nanocluster's temperature from 440 to 790 K. When the Al(100)(+) cluster melts at 620-660 K, the threshold drops by approximately 1 eV (approximately 96 kJ/mol). A decrease in the activation energy of this magnitude causes a 10(8)-fold increase in the reaction rate at the melting temperature. The decrease in the activation energy may result from the mobility of the surface atoms on the liquid cluster, which allows them to move to a lower energy arrangement as the N(2) approaches.
Details
- Language :
- English
- ISSN :
- 1520-5126
- Volume :
- 131
- Issue :
- 7
- Database :
- MEDLINE
- Journal :
- Journal of the American Chemical Society
- Publication Type :
- Academic Journal
- Accession number :
- 19191490
- Full Text :
- https://doi.org/10.1021/ja809516h