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Reversible random sequential adsorption of mixtures on a triangular lattice.

I Loncarević¹, Lj Budinski-Petković, S B Vrhovac

¹Faculty of Engineering, Trg D. Obradovića 6, Novi Sad 21000, Serbia.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics

|October 13, 2007

Summary

This study numerically investigates how object shape symmetry affects reversible adsorption in binary mixtures on a 2D lattice. Findings reveal collective events and mixture composition significantly influence adsorption kinetics and steady-state coverage.

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Area of Science:

Statistical Physics
Surface Science
Computational Chemistry

Background:

Reversible random sequential adsorption (RSA) is crucial for understanding surface processes.
Binary mixtures introduce complexity due to interactions and differing particle properties.
Lattice models provide a simplified yet powerful framework for studying adsorption phenomena.

Purpose of the Study:

To numerically investigate the influence of shape symmetry on adsorption-desorption kinetics in binary mixtures.
To analyze the role of collective events and mixture composition in two-component RSA.
To develop a predictive model for steady-state coverage in binary mixtures of equal-sized objects.

Main Methods:

Monte Carlo simulations were employed to model reversible random sequential adsorption.
The study focused on binary mixtures of extended objects on a two-dimensional triangular lattice.
Self-avoiding lattice steps were used to define the depositing objects' shapes.

Main Results:

Shape symmetry significantly impacts the kinetics of adsorption-desorption processes.
Collective events play a key role in governing the time-coverage behavior of components.
Mixture composition influences the overall deposition process and final coverage.

Conclusions:

Object symmetry is a critical factor in RSA of binary mixtures.
A simple formula can predict mixture steady-state coverage from pure component data for equal-sized objects.
Understanding these factors is essential for designing surface processes and materials.