Van der waals dispersion forces between dielectric nanoclusters

Hye Young Kim, Jorge Osvaldo Sofo, Darrell Velegol, Milton Walter Cole, Amand A. Lucas

Research output: Contribution to journalArticlepeer-review

63 Scopus citations

Abstract

Various methods are evaluated for their ability to calculate accurate van der Waals (VDW) dispersion forces between nanoclusters. We compare results for spheres using several methods: the simple Hamaker two-body method, the Lifshitz (DLP) theory with the Derjaguin approximation, the Langbein result for spheres, and our "coupled dipole method" (CDM). The assumptions and shortcomings of each method are discussed. The CDM accounts for all n-body forces, does not assume a continuous and homogeneous dielectric function in each material, accounts for the discreteness of atoms in the particles, can be used for particles of arbitrary shape, and can exactly include the effects of various media. At present, the CDM does not account for retardation. It is shown that even for spheres, methods other than the CDM often give errors of 20% or more for VDW dispersion forces between typical dielectric materials. A related calculation for metals reveals an error in the Hamaker two-body result of nearly a factor of 2.

Original languageEnglish (US)
Pages (from-to)1735-1740
Number of pages6
JournalLangmuir
Volume23
Issue number4
DOIs
StatePublished - Feb 13 2007

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Spectroscopy
  • Electrochemistry

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