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Phys Rev Lett. 2003 Sep 5;91(10):106102. Epub 2003 Sep 4.

Higher surface energy of free nanoparticles.

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  • 1Department of Electrical Engineering and Information Technology, University Duisburg-Essen, 47048 Duisburg, Germany.


We present an accurate online method for the study of size-dependent evaporation of free nanoparticles allowing us to detect a size change of 0.1 nm. This method is applied to Ag nanoparticles. The linear relation between the onset temperature of evaporation and the inverse of the particle size verifies the Kelvin effect and predicts a surface energy of 7.2 J/m(2) for free Ag nanoparticles. The surface energy of nanoparticles is significantly higher as compared to that of the bulk and is essential for processes such as melting, coalescence, evaporation, growth, etc., of nanoparticles.

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