Molecular dynamics (MD) simulations were employed to investigate the mechanism and kinetics of the solid-state sintering of two crystalline gold nanoparticles induced by low energy laser heating. At low temperature , sintering can occur between two bare nanoparticles by elastic and plastic deformation driven by strong local potential gradients. This initial neck growth occurs very fast , and is therefore essentially insensitive to laser irradiation. This paper focuses on the subsequent longer time scale intermediate neck growth process induced by laser heating. The classical diffusion based neck growth model is modified to predict the time resolved neck growth during continuous heating with the diffusion coefficients and surface tension extracted from MD simulation. The diffusion model underestimates the neck growth rate for smaller particles while satisfactory agreement is obtained for larger particles . The deviation is due to the ultrafine size effect for particles below . Various possible mechanisms were identified and discussed.
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e-mail: cgrigoro@me.berkeley.edu
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September 2008
This article was originally published in
Journal of Heat Transfer
Research Papers
The Solid-State Neck Growth Mechanisms in Low Energy Laser Sintering of Gold Nanoparticles: A Molecular Dynamics Simulation Study
Heng Pan,
Heng Pan
Laser Thermal Laboratory, Department of Mechanical Engineering,
University of California-Berkeley
, Berkeley, CA 94720-1740
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Seung H. Ko,
Seung H. Ko
Laser Thermal Laboratory, Department of Mechanical Engineering,
University of California-Berkeley
, Berkeley, CA 94720-1740
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Costas P. Grigoropoulos
Costas P. Grigoropoulos
Laser Thermal Laboratory, Department of Mechanical Engineering,
e-mail: cgrigoro@me.berkeley.edu
University of California-Berkeley
, Berkeley, CA 94720-1740
Search for other works by this author on:
Heng Pan
Laser Thermal Laboratory, Department of Mechanical Engineering,
University of California-Berkeley
, Berkeley, CA 94720-1740
Seung H. Ko
Laser Thermal Laboratory, Department of Mechanical Engineering,
University of California-Berkeley
, Berkeley, CA 94720-1740
Costas P. Grigoropoulos
Laser Thermal Laboratory, Department of Mechanical Engineering,
University of California-Berkeley
, Berkeley, CA 94720-1740e-mail: cgrigoro@me.berkeley.edu
J. Heat Transfer. Sep 2008, 130(9): 092404 (7 pages)
Published Online: July 11, 2008
Article history
Received:
July 5, 2007
Revised:
October 11, 2007
Published:
July 11, 2008
Citation
Pan, H., Ko, S. H., and Grigoropoulos, C. P. (July 11, 2008). "The Solid-State Neck Growth Mechanisms in Low Energy Laser Sintering of Gold Nanoparticles: A Molecular Dynamics Simulation Study." ASME. J. Heat Transfer. September 2008; 130(9): 092404. https://doi.org/10.1115/1.2943303
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