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Brownian dynamics simulation of monolayer formation by deposition of colloidal particles: A kinetic study at high bulk particle concentration

The European Physical Journal E volume 35, Article number: 69 (2012) Cite this article

Abstract

Brownian dynamics simulations (BDS) of sedimentation and irreversible adsorption of colloidal particles on a planar surface were carried out at bulk particle volume fractions (φ) in the range 0.05 to 0.25. The sedimentation and adsorption of colloidal particles were simulated as a non-sequential process that allows simultaneous settling and adsorption of particles. A kinetic model for the formation of particle monolayers based on the available surface fraction (θ A ) is proposed to predict simulation results. The simulations show a value of 0.625 for the maximum fractional surface coverage (θ ∞) and a monolayer structure insensitive to φ. However, the kinetic order of the monolayer formation process has a strong dependence with φ, changing from a value close to a unit, at low φ, to a value around two at high φ. This change in the kinetic reaction order is associated to differences of particle adsorption mechanism on the surface. At low φ values, the monolayer formation is achieved by independent adsorption of single particles and the reaction order is close to 1. At high φ values, the simultaneous adsorption of two particles on the surface leads to an increase of the reaction order to values close to 2.

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Affiliations

  1. Colloids Group, Institute of Chemistry, University of Antioquia, A.A. 1226, Medellin, Colombia

    C. A. Pérez & H. Casanova

  2. Biocolloid and Fluid Physics Group, Applied Physics Department, University of Granada, Campus Fuentenueva, 18071, Granada, Spain

    A. Moncho-Jordá & R. Hidalgo-Álvarez

Authors
  1. C. A. Pérez
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  2. A. Moncho-Jordá
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  3. R. Hidalgo-Álvarez
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  4. H. Casanova
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Correspondence to H. Casanova.

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Pérez, C.A., Moncho-Jordá, A., Hidalgo-Álvarez, R. et al. Brownian dynamics simulation of monolayer formation by deposition of colloidal particles: A kinetic study at high bulk particle concentration. Eur. Phys. J. E 35, 69 (2012). https://doi.org/10.1140/epje/i2012-12069-x

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  • DOI: https://doi.org/10.1140/epje/i2012-12069-x

Keywords

  • Soft Matter: Colloids and Nanoparticles