Random sequential adsorption of polyatomic species on fractal substrates

CORNETTE V.; RAMIREZ PASTOR A. J.; NIETO F.

PHYSICAL REVIEW E

AMER PHYSICAL SOC

Año: 2011 vol. 83 p. 51119 - 51129

1539-3755

Random sequential adsorption of k-mers of different sizes and shapes deposited on two types of fractal surfaces (deterministic and staistical) is studied. These kinds of substrates present intrinsic heterogeneities. As a consequence, the average coordination number depends on the topology that characterizes the adsorbent. For discrete models, at the late stage the surface coverage evolves according to θ(t ) = θj − Aexp[− t/σ ], where θj is the jamming coverage while A and σ are fitting parameters. A detailed analysis of how these main quantities [θj , σ] depend on the relationship between the geometry of the adsorbate and the adsorbent is presented. The results obtained suggest that the symmetry of the substrate may exert a decisive influence on the adsorption kinetics of polyatomic species.