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Self-similar etching.

José Bico1, Jérôme Vierling, Aurélien Vigano

  • 1Physique et Mécanique des Milieux Hétérogènes, UMR 7636 du CNRS, Ecole Supérieure de Physique et Chimie Industrielles, 10, rue Vauquelin, 75231 Paris Cedex 05, France.

Journal of Colloid and Interface Science
|December 25, 2003
PubMed
Summary
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Corrosive liquids releasing gases during fiber etching create unique self-similar shapes. This occurs due to the pinning and detachment of the meniscus, influenced by bubble-driven convection.

Area of Science:

  • Materials Science
  • Fluid Dynamics
  • Surface Chemistry

Background:

  • Fiber etching typically results in conical tips when using soft etching liquids.
  • Understanding meniscus dynamics is crucial for controlling etching processes.

Purpose of the Study:

  • To investigate the formation of novel self-similar shapes during fiber etching.
  • To elucidate the role of gas release and convection in shaping etched fibers.

Main Methods:

  • Etching experiments using corrosive liquids that release gases.
  • Microscopic observation of fiber tip evolution.
  • Analysis of meniscus behavior, including pinning and detachment.
  • Investigating the impact of bubble-induced convection.

Related Experiment Videos

Main Results:

  • Demonstrated the formation of self-similar shapes during etching with gas-releasing liquids.
  • Identified successive pinning and detachment of the meniscus as the mechanism for self-similar shape formation.
  • Characterized the conditions favoring these unique shapes.
  • Highlighted the significant influence of convection caused by released bubbles on the etching process.

Conclusions:

  • Gas-releasing corrosive liquids can produce complex self-similar fiber tip morphologies.
  • Meniscus dynamics, particularly pinning and detachment, are key to achieving these shapes.
  • Bubble-induced convection plays a critical role in the evolution of these unique etched structures.