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Journal of Chemical Physics / Volume 108 / Issue 23 / SURFACES, INTERFACES, AND MATERIALS

J. Chem. Phys. 108, 9851 (1998); http://dx.doi.org/10.1063/1.476423 (8 pages)

Random sequential adsorption on partially covered surfaces

Zbigniew Adamczyk and Paweł Weroński

Institute of Catalysis and Surface Chemistry, Polish Academy of Sciences, 30-239 Cracow, ul.Niezapominajek 1, Poland

(Received 24 October 1997; accepted 11 March 1998)

The random sequential adsorption (RSA) approach was used to analyze adsorption of hard spheres at surfaces precovered with smaller sized particles. Numerical simulations were performed to determine the available surface function ϕl of larger particles for various particle size ratios λ = al/as and surface concentration of smaller particles θs. It was found that the numerical results were in a reasonable agreement with the formula stemming from the scaled particle theory with the modification for the sphere/sphere geometry. Particle adsorption kinetics was also determined in terms of the RSA simulations. By extrapolating the θl vs τ−1/2 dependencies, the jamming concentrations of larger spheres θl∞ were determined as a function of the initial smaller sphere concentration. It was found that θl∞ were considerably reduced by the presence of smaller sized particles, especially for λ≫1. The pair correlation function g of larger particles in the jamming state was also determined, showing more short range ordering (at the same θl) in comparison with monodisperse systems. The theoretical predictions stemming from our calculations suggest that the presence of trace amounts of very small particles may exert a decisive influence on adsorption of larger particles. © 1998 American Institute of Physics.

© 1998 American Institute of Physics

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KEYWORDS and PACS

Keywords

adsorption, particle size, random processes

PACS

  • 68.03.Fg

    Evaporation and condensation of liquids

  • 68.43.Mn

    Adsorption kinetics

  • 68.43.-h

    Chemisorption/physisorption: adsorbates on surfaces

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.476423

PUBLICATION DATA

ISSN

0021-9606 (print)  
1089-7690 (online)

Publisher

$abstract.society.value is a Member of CrossRef American Institute of Physics

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