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Related Experiment Videos

Reabsorption effect and spatial ordering in island ripening.

D M Tarr1, P A Mulheran

  • 1Department of Physics, University of Reading, Whiteknights, P.O. Box 220, Reading RG6 6AF, United Kingdom.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|October 4, 2003
PubMed
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Island ripening models show that islands reabsorbing their own monomers (pedophagous effect) create spatial ordering. This ordering improves understanding of island growth and size distribution in various ripening systems.

Area of Science:

  • Surface science
  • Materials science
  • Physical chemistry

Background:

  • Island ripening is a key process in thin film growth and surface evolution.
  • Detachment-limited ripening involves monomer diffusion and aggregation.
  • The role of monomer reabsorption by islands has been historically overlooked.

Purpose of the Study:

  • To analyze a detachment-limited island ripening model incorporating a reabsorption (pedophagous) effect.
  • To investigate the impact of this effect on spatial ordering, island growth rates, and size distribution.
  • To compare model predictions with experimental observations.

Main Methods:

  • Development and analysis of a theoretical model for island ripening.
  • Simulation of island arrays with and without the pedophagous effect.

Related Experiment Videos

  • Quantitative analysis of spatial ordering using neighbor correlations.
  • Comparison of model results with classic mean field theory.

    • Main Results:

    • Without the pedophagous effect, island arrays are spatially disordered and follow classic mean field theory.
    • Including the pedophagous effect leads to spatial ordering in island arrays, consistent with experiments.
    • The spatial ordering correlates island size with the number of neighbors.
    • Modified mean field growth rates and an improved island size distribution expression were derived.

    Conclusions:

    • The pedophagous effect is crucial for understanding spatial ordering in ripening systems.
    • The developed model provides a more accurate description of island size distribution and growth dynamics.
    • The findings suggest broad applicability to various experimental ripening systems.