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Moving contact lines on heterogeneous substrates.

Ramin Golestanian1

  • 1Institute for Advanced Studies in Basic Sciences, Zanjan 45195-159, Iran. golestan@iasbs.ac.ir

Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences
|August 13, 2004
PubMed
Summary
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The study reveals that receding contact line dynamics on disordered surfaces, particularly at high velocities, resemble a roughening transition. This suggests a coating transition linked to surface disorder and de-pinning phenomena.

Area of Science:

  • Physics
  • Materials Science
  • Surface Science

Background:

  • Understanding the behavior of moving contact lines on heterogeneous surfaces is crucial in various scientific and industrial applications.
  • The influence of substrate disorder on contact line dynamics, including pinning and de-pinning, remains a complex area of study.

Purpose of the Study:

  • To formulate the dynamics of moving contact line deformations on disordered substrates.
  • To investigate the relationship between coating transitions and roughening transitions in receding contact lines.
  • To propose a phase diagram illustrating the interplay of coating, pinning, and de-pinning transitions.

Main Methods:

  • Formulation of contact line dynamics incorporating interfacial forces and dissipation mechanisms.
  • Application of dynamical renormalization group calculations.

Related Experiment Videos

  • Development of a phase diagram for the system.

    • Main Results:

    • The coating transition in receding contact lines at high velocities can be interpreted as a roughening transition.
    • A phase diagram is proposed where coating and pinning transition boundaries intersect.
    • Strong disorder leads to immediate Landau-Levich film formation post de-pinning.

    Conclusions:

    • Contact line dynamics on disordered substrates are significantly influenced by interfacial forces and dissipation.
    • Roughening transitions provide a framework for understanding coating transitions in receding contact lines.
    • The proposed phase diagram offers insights into the complex behavior of contact lines under varying disorder strengths.