INFLUENCE OF HYDRODYNAMIC INTERACTIONS ON THE BALLISTIC DEPOSITION OFCOLLOIDAL PARTICLES ON SOLID-SURFACES

The ballistic deposition of particles by taking hydrodynamic interacti ons (HI) into account has been studied by means of computer simulation s. The radial distribution function of the assembly of particles depos ited on a plane has been determined as a function of the coverage and compared to experimental data. It appears that the introduction of HI in the model when compared to the ballistic model (BM) predictions lea ds to a better agreement between experiment and simulation in particul ar for the radial distribution function. HI also modify the value of t he first non-vanishing term (B-3) in the expansion of the available su rface function, Phi, in the coverage. One can estimate the ratio B-3(B HM)/B(3)(BM)similar to 0.5, where B-3(BHM) (resp. B-3(BM)) corresponds to simulations in which HI have been (resp. have not been) taken into account. The introduction of HI, however, leads to small changes in P hi. Finally, we conclude that, as far as average global quantities are concerned, the BM without HI constitutes a good approximation. It is only for the detailed analysis of the structure of the layer of deposi ted particles that HI play a significant quantitative role. (C) 1996 A merican Institute of Physics.