Coarsening of Two-Dimensional Nanoclusters on Metal Surfaces

dc.contributor.author Thiel, Patricia
dc.contributor.author Shen, Mingmin
dc.contributor.author Liu, Da-Jiang
dc.contributor.author Evans, James
dc.contributor.department Ames National Laboratory
dc.contributor.department Materials Science and Engineering
dc.contributor.department Mathematics
dc.contributor.department Chemistry
dc.date 2018-02-13T12:49:46.000
dc.date.accessioned 2020-06-30T01:18:30Z
dc.date.available 2020-06-30T01:18:30Z
dc.date.copyright Thu Jan 01 00:00:00 UTC 2009
dc.date.embargo 2013-06-25
dc.date.issued 2009-08-02
dc.description.abstract <p>We describe experimental observations and theoretical analysis of the coarsening of distributions of two-dimensional nanoclusters, either adatom islands or vacancy pits, on metal surfaces. A detailed analyses is provided for Ag(111) and Ag(100) surfaces, although we also discuss corresponding behavior for Cu(111) and Cu(100) surfaces. The dominant kinetic pathway for coarsening can be either Ostwald ripening (OR), i.e., growth of larger clusters at the expense of smaller ones, or Smoluchowski ripening (SR), i.e., diffusion and coalescence of clusters. First, for pristine additive-free surfaces, we elucidate the factors which control the dominant pathway. OR kinetics generally follows the predictions of mesoscale continuum theories. SR kinetics is controlled by the size-dependence of cluster diffusion. However, this size-dependence, together with that of nanostructure shape relaxation upon coalescence, often deviates from mesoscale predictions as a direct consequence of the nanoscale dimension of the clusters. Second, we describe examples for the above systems where trace amounts of a chemical additive lead to dramatic enhancement of coarsening. We focus on the scenario where “facile reaction” of metal and additive atoms leads to the formation of mobile additive-metal complexes which can efficiently transport metal across the surface, i.e., additive-enhanced OR. A suitable reaction-diffusion equation formulation is developed to describe this behavior.</p>
dc.description.comments <p>Reprinted (adapted) with permission from <em>The Journal of Physical Chemistry C</em> 113, no. 13 (2009): 5047–5067, doi:<a href="http://dx.doi.org/10.1021/jp8063849" target="_blank">10.1021/jp8063849</a>. Copyright 2009 American Chemical Society.</p>
dc.format.mimetype application/pdf
dc.identifier archive/lib.dr.iastate.edu/chem_pubs/22/
dc.identifier.articleid 1024
dc.identifier.contextkey 4257699
dc.identifier.s3bucket isulib-bepress-aws-west
dc.identifier.submissionpath chem_pubs/22
dc.identifier.uri https://dr.lib.iastate.edu/handle/20.500.12876/14660
dc.language.iso en
dc.source.bitstream archive/lib.dr.iastate.edu/chem_pubs/22/0-2009_ThielPA_CoarseningTwoDimensional.pdf|||Fri Jan 14 22:39:53 UTC 2022
dc.source.bitstream archive/lib.dr.iastate.edu/chem_pubs/22/2009_ThielPA_CoarseningTwoDimensional.pdf|||Fri Jan 14 22:39:55 UTC 2022
dc.source.uri 10.1021/jp8063849
dc.subject.disciplines Materials Science and Engineering
dc.subject.disciplines Mathematics
dc.subject.disciplines Physical Chemistry
dc.subject.keywords Ames Laboratory
dc.subject.keywords Materials Science and Engineering
dc.subject.keywords Mathematics
dc.title Coarsening of Two-Dimensional Nanoclusters on Metal Surfaces
dc.type article
dc.type.genre article
dspace.entity.type Publication
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