Ching-Cher Sanders Yan

Effect of surface roughness on diffusion limited reactions, a multifractal scaling analysis

Eley-Rideal diffusion limited reactions (DLR) were performed over different rough surfaces generated by Rain model. Multifractal scaling analysis has been carried out on the reaction probability distribution to investigate the effect of surface roughness on the chemical reactions. The results are compared with the DLRs over surface of diffusion limited aggregation (DLA).

Multifractal scaling analysis of autopoisoning reactions over a rough surface

Decay type diffusion-limited reactions (DLR) over a rough surface generated by a random deposition model were performed. To study the effect of the decay profile on the reaction probability distribution (RPD), multifractal scaling analysis has been carried out. The dynamics of these autopoisoning reactions are controlled by the two parameters in the decay function, namely, the initial sticking probability (Pini) of every site and the decay rate (m). The smaller the decay rate, the narrower is the range of α values in the α–f(α) multifractal spectrum. The results are compared with the earlier work of DLR over a surface of diffusion-limited aggregation (DLA). We also considered here the autopoisoning reactions over a smooth surface for comparing our results, which show clearly how the roughness affects the chemical reactions. The q–τ(q) multifractal curves for the smooth surface are linear whereas those for the rough surface are nonlinear. The range of α values in the case of a rough surface is wider than that of the smooth surface.

Eley–Rideal diffusion limited reactions over rough surface

The effect of surface roughness on Eley–Rideal diffusion limited reactions is studied. The rough surfaces are generated using a random deposition model and a random deposition with diffusion model. The former model generates the rough surface with no correlations between the heights of different columns whereas the latter generates the rough surface with correlations between the heights of different columns. Multifractal scaling analysis has been carried out on the reaction probability distribution. The reaction probability distribution has a wider range for the surface of random deposition than that of random deposition with diffusion.