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Width distribution of contact lines on a disordered substrate.

Sébastien Moulinet1, Alberto Rosso, Werner Krauth

  • 1CNRS-Laboratoire de Physique Statistique de l'Ecole Normale Supérieure, 24 rue Lhomond, 75231 Paris, France.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|April 20, 2004
PubMed
Summary

We studied contact line roughness on disordered substrates. Experimental data confirm the Joanny-de Gennes model is insufficient for depinning threshold dynamics.

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Area of Science:

  • Physics
  • Materials Science
  • Surface Science

Background:

  • Contact line dynamics are crucial in various physical phenomena.
  • Understanding surface roughness is key to predicting material behavior.
  • Disordered substrates introduce complex interactions at interfaces.

Purpose of the Study:

  • To analyze the roughness of a contact line on a disordered substrate.
  • To characterize roughness completely using width distribution.
  • To test the validity of the Joanny-de Gennes model at the depinning threshold.

Main Methods:

  • Experimental measurement of contact line width distribution.
  • Comparison of experimental data with theoretical models.
  • Analysis of roughness on disordered substrates.

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Main Results:

  • The measured width distribution accurately matches theoretical predictions for open boundary conditions.
  • The experimental data strongly suggest limitations of the Joanny-de Gennes model.
  • Contact line roughness is fully characterized by its width distribution.

Conclusions:

  • The Joanny-de Gennes model is inadequate for describing contact line dynamics at the depinning threshold.
  • Width distribution is a complete descriptor of contact line roughness.
  • Further theoretical development is needed to capture depinning dynamics accurately.