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Article: Influence of Surface Reaction Rate on the Size Dispersion of Interfacial Nanostructures

TitleInfluence of Surface Reaction Rate on the Size Dispersion of Interfacial Nanostructures
Authors
KeywordsDiffusion
Particle Size Analysis
Probability
Reaction Kinetics
Surface Chemistry
Issue Date2003
PublisherAmerican Chemical Society. The Journal's web site is located at http://www.pubs.acs.org/jpcb
Citation
Journal of Physical Chemistry B, 2003, v. 107 n. 38, p. 10513-10520 How to Cite?
AbstractBrownian Dynamics (BD) simulations of instantaneous nucleation followed by diffusion-controlled growth of metal nanoparticles on surfaces have shown that a regular distribution of nucleation sites on the surface leads to a reduction in particle size dispersion. However, for several applications, the distribution of active sites on the surface is irregular and random. We use BD simulations to investigate the influence of surface reaction rate on the development of size dispersion of interfacial nanostructures that form by irreversible deposition of noninteracting particles onto surfaces with randomly distributed nucleation sites. The macroscopic balance between the surface reaction rate and bulk diffusion is incorporated into the BD simulations by using a reaction probability that approaches unity in the case of instantaneous, diffusion-limited deposition. It is found that the size uniformity of the growing particles on the randomly distributed active sites can be improved by decreasing the reaction probability. The overlap of diffusion zones surrounding the growing particles, referred to as interparticle diffusional coupling, is responsible for the particle size dispersion in diffusion-controlled growth on randomly distributed sites. The simulation results, in qualitative agreement with experiments, show that reducing the reaction probability is an effective means to reduce the interparticle diffusion coupling, and thereby reduce the particle size dispersion. This could be accomplished by manipulating the process variables that influence the surface reaction rate and/or the bulk diffusivity of the particles.
Persistent Identifierhttp://hdl.handle.net/10722/91032
ISSN
2015 Impact Factor: 3.187
2015 SCImago Journal Rankings: 1.414
References

 

DC FieldValueLanguage
dc.contributor.authorMagan, RVen_HK
dc.contributor.authorSureshkumar, Ren_HK
dc.contributor.authorLin, Ben_HK
dc.date.accessioned2010-09-17T10:12:01Z-
dc.date.available2010-09-17T10:12:01Z-
dc.date.issued2003en_HK
dc.identifier.citationJournal of Physical Chemistry B, 2003, v. 107 n. 38, p. 10513-10520en_HK
dc.identifier.issn1520-6106en_HK
dc.identifier.urihttp://hdl.handle.net/10722/91032-
dc.description.abstractBrownian Dynamics (BD) simulations of instantaneous nucleation followed by diffusion-controlled growth of metal nanoparticles on surfaces have shown that a regular distribution of nucleation sites on the surface leads to a reduction in particle size dispersion. However, for several applications, the distribution of active sites on the surface is irregular and random. We use BD simulations to investigate the influence of surface reaction rate on the development of size dispersion of interfacial nanostructures that form by irreversible deposition of noninteracting particles onto surfaces with randomly distributed nucleation sites. The macroscopic balance between the surface reaction rate and bulk diffusion is incorporated into the BD simulations by using a reaction probability that approaches unity in the case of instantaneous, diffusion-limited deposition. It is found that the size uniformity of the growing particles on the randomly distributed active sites can be improved by decreasing the reaction probability. The overlap of diffusion zones surrounding the growing particles, referred to as interparticle diffusional coupling, is responsible for the particle size dispersion in diffusion-controlled growth on randomly distributed sites. The simulation results, in qualitative agreement with experiments, show that reducing the reaction probability is an effective means to reduce the interparticle diffusion coupling, and thereby reduce the particle size dispersion. This could be accomplished by manipulating the process variables that influence the surface reaction rate and/or the bulk diffusivity of the particles.en_HK
dc.languageengen_HK
dc.publisherAmerican Chemical Society. The Journal's web site is located at http://www.pubs.acs.org/jpcben_HK
dc.relation.ispartofJournal of Physical Chemistry Ben_HK
dc.subjectDiffusionen_HK
dc.subjectParticle Size Analysisen_HK
dc.subjectProbabilityen_HK
dc.subjectReaction Kineticsen_HK
dc.subjectSurface Chemistryen_HK
dc.titleInfluence of Surface Reaction Rate on the Size Dispersion of Interfacial Nanostructuresen_HK
dc.typeArticleen_HK
dc.identifier.emailLin, B:blin@hku.hken_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.scopuseid_2-s2.0-0141959789en_HK
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-0141959789&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume107en_HK
dc.identifier.issue38en_HK
dc.identifier.spage10513en_HK
dc.identifier.epage10520en_HK

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