Effect of collision efficiency on the evolution of the surface of diffusion-limited deposits

The effect of the collision efficiency of particles deposited onto a rough substrate and the evolution of the deposit profile were investigated using 2D on-lattice Monte Carlo simulations. The case of a diffusive long-range t ransport regime as representative of the colloidal deposition from the susp ended phase was considered. The initial profile of the substrate was modele d as a sinusoidal wave. The decay of the initial profile in the course of d eposition was monitored by a decrease in the Fourier amplitude A(w) corresp onding to the wavelength of the initial roughness. The best "memory" of the deposit, i.e., the slowest decay of A(w), was found to correspond to inter mediate values (similar to0.1) of the collision efficiency. (C) 2001 Academ ic Press.