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Annular Ringlike Arrays from Mixtures of Metal Nanoparticles

Published online by Cambridge University Press:  10 February 2011

P. C. Ohara ,
J. R. Heath  and
W. M. Gelbart
P. C. Ohara
Affiliation:
Department of Chemistry & Biochemistry, University of California, Los Angeles, CA, 90095–1569, pohara@ucla.edu
J. R. Heath
Affiliation:
Department of Chemistry & Biochemistry, University of California, Los Angeles, CA, 90095–1569, pohara@ucla.edu
W. M. Gelbart
Affiliation:
Department of Chemistry & Biochemistry, University of California, Los Angeles, CA, 90095–1569, pohara@ucla.edu
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Abstract

We describe a theory for hole nucleation in volatile, wetting, thin liquid films. Hole nucleation in this system can occur due to two independent driving forces: evaporation (volatile hole nucleation) and by disjoining pressure effects (non-volatile hole nucleation). Although a concerted combination of these two can be in effect, the cases are treated separately here and will be treated jointly in the context of a simulation elsewhere. Growing holes – dry areas of the solid surface which are otherwise wet by solvent – are conjectured to be responsible for the formation of close-packed 2D annular ringlike arrays from dilute solutions of nearly monodisperse, large (3–5nm diameter), organically passivated metal particles [1]. When organic solutions of these nanoparticles are evaporated on a solid carbon substrate (a TEM grid), the resulting sub-monolayer structures are annular ringlike arrays due to the pinning of the rim of an opening hole by a sufficient collection of particles.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 463: Symposia EE – Statistical Mechanics in Physics and Biology , 1996 , 299
Copyright
Copyright © Materials Research Society 1997

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References

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