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contributor authorHeng Pan
contributor authorSeung H. Ko
contributor authorCostas P. Grigoropoulos
date accessioned2017-05-09T00:28:56Z
date available2017-05-09T00:28:56Z
date copyrightSeptember, 2008
date issued2008
identifier issn0022-1481
identifier otherJHTRAO-27843#092404_1.pdf
identifier urihttp://yetl.yabesh.ir/yetl/handle/yetl/138475
description abstractMolecular dynamics (MD) simulations were employed to investigate the mechanism and kinetics of the solid-state sintering of two crystalline gold nanoparticles (4.4–10.0nm) induced by low energy laser heating. At low temperature (300K), 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 (<150ps), 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 (5.4nm) while satisfactory agreement is obtained for larger particles (10nm). The deviation is due to the ultrafine size effect for particles below 10nm. Various possible mechanisms were identified and discussed.
publisherThe American Society of Mechanical Engineers (ASME)
titleThe Solid-State Neck Growth Mechanisms in Low Energy Laser Sintering of Gold Nanoparticles: A Molecular Dynamics Simulation Study
typeJournal Paper
journal volume130
journal issue9
journal titleJournal of Heat Transfer
identifier doi10.1115/1.2943303
journal fristpage92404
identifier eissn1528-8943
keywordsLasers
keywordsParticulate matter
keywordsSintering
keywordsNanoparticles
keywordsHeating
keywordsMolecular dynamics simulation
keywordsMechanisms
keywordsDiffusion (Physics)
keywordsAtoms AND Irradiation (Radiation exposure)
treeJournal of Heat Transfer:;2008:;volume( 130 ):;issue: 009
contenttypeFulltext


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