Distance upon contact: Determination from roughness profile

P.J. van Zwol, Vitaly Svetovoy, G. Palasantzas

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Abstract

The point at which two random rough surfaces make contact takes place at the contact of the highest asperities. The distance upon contact d0 in the limit of zero load has crucial importance for determination of dispersive forces. Using gold films as an example we demonstrate that for two parallel plates d0 is a function of the nominal size of the contact area L and give a simple expression for d0(L) via the surface roughness characteristics. In the case of a sphere of fixed radius R and a plate the scale dependence manifests itself as an additional uncertainty δd(L) in the separation, where the scale L is related with the separation d via the effective area of interaction L2∼πRd. This uncertainty depends on the roughness of interacting bodies and disappears in the limit L→∞.
Original languageUndefined
Article number10.1103/PhysRevB.80.235401
Pages (from-to)235401
Number of pages5
JournalPhysical review B: Condensed matter and materials physics
Volume80
Issue number23
DOIs
Publication statusPublished - 1 Dec 2009

Keywords

  • EWI-17170
  • IR-69465
  • METIS-264315

Cite this

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Distance upon contact: Determination from roughness profile. / van Zwol, P.J.; Svetovoy, Vitaly; Palasantzas, G.

In: Physical review B: Condensed matter and materials physics, Vol. 80, No. 23, 10.1103/PhysRevB.80.235401, 01.12.2009, p. 235401.

Research output: Contribution to journalArticleAcademicpeer-review

TY - JOUR

T1 - Distance upon contact: Determination from roughness profile

AU - van Zwol, P.J.

AU - Svetovoy, Vitaly

AU - Palasantzas, G.

N1 - 10.1103/PhysRevB.80.235401

PY - 2009/12/1

Y1 - 2009/12/1

N2 - The point at which two random rough surfaces make contact takes place at the contact of the highest asperities. The distance upon contact d0 in the limit of zero load has crucial importance for determination of dispersive forces. Using gold films as an example we demonstrate that for two parallel plates d0 is a function of the nominal size of the contact area L and give a simple expression for d0(L) via the surface roughness characteristics. In the case of a sphere of fixed radius R and a plate the scale dependence manifests itself as an additional uncertainty δd(L) in the separation, where the scale L is related with the separation d via the effective area of interaction L2∼πRd. This uncertainty depends on the roughness of interacting bodies and disappears in the limit L→∞.

AB - The point at which two random rough surfaces make contact takes place at the contact of the highest asperities. The distance upon contact d0 in the limit of zero load has crucial importance for determination of dispersive forces. Using gold films as an example we demonstrate that for two parallel plates d0 is a function of the nominal size of the contact area L and give a simple expression for d0(L) via the surface roughness characteristics. In the case of a sphere of fixed radius R and a plate the scale dependence manifests itself as an additional uncertainty δd(L) in the separation, where the scale L is related with the separation d via the effective area of interaction L2∼πRd. This uncertainty depends on the roughness of interacting bodies and disappears in the limit L→∞.

KW - EWI-17170

KW - IR-69465

KW - METIS-264315

U2 - 10.1103/PhysRevB.80.235401

DO - 10.1103/PhysRevB.80.235401

M3 - Article

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SP - 235401

JO - Physical review B: Condensed matter and materials physics

JF - Physical review B: Condensed matter and materials physics

SN - 1098-0121

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