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Controlling Nanoparticles Formation in Molten Metallic Bilayersby Pulsed-Laser Interference Heating

Published online by Cambridge University Press:  09 July 2012

M. Khenner*
Affiliation:
Department of Mathematics, Applied Physics Institute, Western Kentucky University, Bowling Green, KY 42101
S. Yadavali
Affiliation:
Department of Chemical and Biomolecular Engineering, The University of Tennessee, Knoxville, TN 37996
R. Kalyanaraman
Affiliation:
Department of Chemical and Biomolecular Engineering, Department of Materials Science and Engineering, Sustainable Energy Education Research Center, The University of Tennessee, Knoxville, TN 37996
*
Corresponding author. E-mail: [email protected].
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Abstract

The impacts of the two-beam interference heating on the number of core-shell and embeddednanoparticles and on nanostructure coarsening are studied numerically based on thenon-linear dynamical model for dewetting of the pulsed-laser irradiated, thin (< 20nm) metallic bilayers. The model incorporates thermocapillary forces and disjoiningpressures, and assumes dewetting from the optically transparent substrate atop of thereflective support layer, which results in the complicated dependence of lightreflectivity and absorption on the thicknesses of the layers. Stabilizing thermocapillaryeffect is due to the local thickness-dependent, steady-state temperature profile in theliquid, which is derived based on the mean substrate temperature estimated from theelaborate thermal model of transient heating and melting/freezing. Linear stabilityanalysis of the model equations set for Ag/Co bilayer predicts the dewetting length scalesin the qualitative agreement with experiment.

Type
Research Article
Copyright
© EDP Sciences, 2012

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