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Computer simulation study of irreversible adsorption: coverage fluctuations.

Jordi Faraudo1, Javier Bafaluy

  • 1Departament de Física, Grup de Fisica Estadistica, Facultat de Ciencies Edifici Cc, Universitat Autònoma de Barcelona, E-08193 Bellaterra, Barcelona, Spain. jordi@circe.uab.es

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|March 23, 2002
PubMed
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This study uses cellular automata to model particle adsorption on surfaces. System conditions dictate how diffusion and particle interactions affect surface coverage fluctuations, especially near the jamming limit.

Area of Science:

  • Surface science and condensed matter physics.
  • Computational modeling and simulation.

Background:

  • Understanding surface coverage fluctuations is crucial in surface science.
  • Irreversible adsorption processes are fundamental in catalysis and thin-film growth.

Purpose of the Study:

  • To investigate coverage fluctuations in monolayers of irreversibly adsorbed particles.
  • To analyze the influence of bulk diffusion and excluded volume interactions.
  • To determine the role of boundary and initial conditions on these fluctuations.

Main Methods:

  • Development of a cellular automata model.
  • Analysis through computational simulations.
  • Analytical investigations of particle interactions and diffusion.

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Main Results:

  • Coverage fluctuations are significantly affected by bulk diffusion and excluded volume interactions.
  • Macroscopic boundary and initial conditions (open/closed cell) modulate these effects.
  • Excluded volume interactions primarily impact fluctuations near the jamming limit under specific conditions.

Conclusions:

  • Cellular automata provide a robust framework for studying adsorption dynamics.
  • System conditions are key determinants of coverage fluctuation behavior.
  • The jamming limit is a critical state where interaction effects become pronounced.