Capillary condensation and snap-off in nanoscale contacts

William J. Stroud, Joan E Curry, John H. Cushman

Research output: Contribution to journalArticle

46 Citations (Scopus)

Abstract

When a surface is placed in a vapor, several layers of molecules may adsorb depending on the intermolecular forces involved. As two such surfaces are brought together, a critical point is reached at which the gas condenses between the surfaces, forming a capillary across the gap. A cohesive force is associated with the condensed bridge. The reverse process wherein the capillary bridge degenerates as the surfaces are moved apart is called snap-off. These processes play a profound role on scales from the nano to the macro. We have studied this phenomenon via isostrain grand canonical Monte Carlo statistical mechanical simulations for Lennard-Jones fluids. Specifically, we have examined capillary condensation and snap-off between nanocontacts, infinite rectilinear nanowires, and finite rectilinear nanoplatelets, where macroscale concepts and theories are just about impossible to apply. These results are compared to condensation between infinite parallel plates. We discuss our results in terms of the Kelvin equation and van der Waals film-thickening model.

Original languageEnglish (US)
Pages (from-to)688-698
Number of pages11
JournalLangmuir
Volume17
Issue number3
DOIs
StatePublished - 2001
Externally publishedYes

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Contacts (fluid mechanics)
Condensation
condensation
intermolecular forces
parallel plates
Nanowires
Macros
critical point
nanowires
Gases
Vapors
vapors
Molecules
Fluids
fluids
gases
molecules
simulation

ASJC Scopus subject areas

  • Colloid and Surface Chemistry
  • Physical and Theoretical Chemistry

Cite this

Capillary condensation and snap-off in nanoscale contacts. / Stroud, William J.; Curry, Joan E; Cushman, John H.

In: Langmuir, Vol. 17, No. 3, 2001, p. 688-698.

Research output: Contribution to journalArticle

Stroud, William J. ; Curry, Joan E ; Cushman, John H. / Capillary condensation and snap-off in nanoscale contacts. In: Langmuir. 2001 ; Vol. 17, No. 3. pp. 688-698.
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