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Journal of Chemical Physics / Volume 120 / Issue 23 / ARTICLES / Surfaces, Interfaces, and Materials

J. Chem. Phys. 120, 11155 (2004); http://dx.doi.org/10.1063/1.1712967 (8 pages)

Irreversible adsorption of particles at random-site surfaces

Zbigniew Adamczyk, Katarzyna Jaszczółt, Barbara Siwek, and Paweł Weroński

Institute of Catalysis and Surface Chemistry, Polish Academy of Sciences, 30-239 Kraków, Niezapominajek 8, Poland

(Received 24 November 2003; accepted 1 March 2004)

Irreversible adsorption of negatively charged polystyrene latex particles (averaged diameter 0.9 μm) at heterogeneous surfaces was studied experimentally. The substrate bearing a controlled number of adsorption sites was produced by precovering mica sheets by positively charged polystyrene latex (averaged diameter of 0.45 μm). Positive latex (site) deposition was carried out under diffusion-controlled transport conditions and its coverage was determined by direct particle counting using the optical microscopy. Deposition kinetics of larger latex particles (averaged diameter 0.9 μm) at heterogeneous surfaces produced in this way was studied by direct optical microscope observations in the diffusion cell (under no-convection transport conditions). It was demonstrated that the structure of larger particle monolayers, characterized in terms of the pair correlation function, showed much more short-range ordering than it was predicted for homogeneous surface monolayers at the same coverage. This was found in agreement with theoretical predictions derived from the Monte Carlo simulations. On the other hand, particle adsorption kinetics was quantitatively interpreted in terms of numerical solutions of the governing diffusion equation with the nonlinear boundary condition derived from Monte Carlo simulations. From these kinetic measurements maximum (jamming) coverage of particles was determined in an accurate way by extrapolation. It was concluded that both the monolayer structure and jamming coverage were strongly influenced by the site multiplicity (coordination) effect. © 2004 American Institute of Physics.

© 2004 American Institute of Physics

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KEYWORDS and PACS

Keywords

adsorption, surface diffusion, Monte Carlo methods, polymers, mica, negative ions, positive ions, substrates, monolayers

PACS

  • 68.43.Mn

    Adsorption kinetics

  • 68.43.Jk

    Diffusion of adsorbates, kinetics of coarsening and aggregation

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.1712967

PUBLICATION DATA

ISSN

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

Publisher

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

For access to fully linked references, you need to log in.
    Z. Adamczyk, P. Weronski, and E. Musial, J. Chem. Phys. 116, 4665 (2002)JCPSA6000116000011004665000001.

    Z. Adamczyk, L. Szyk-Warszynska, B. Siwek, and P. Weronski, J. Chem. Phys. 113, 11336 (2000)JCPSA6000113000024011336000001.

    B. Widom, J. Chem. Phys. 44, 3888 (1966)JCPSA6000044000010003888000001.

    P. Schaaf and J. Talbot, J. Chem. Phys. 91, 4401 (1989)JCPSA6000091000007004401000001.

    J. W. Evans, Rev. Mod. Phys. 65, 1281 (1993).

    B. Senger, P. Schaaf, J. C. Voegel, A. Johner, A. Schmitt, and J. Talbot, J. Chem. Phys. 97, 3813 (2000)JCPSA6000097000005003813000001.

    B. D. Lubachevsky, V. Privman, and S. C. Roy, Phys. Rev. E 47, 48 (1993).


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