Deposition of Colloidal Particles onHomogeneous Surfaces: Integral-EquationTheory and Monte Carlo Simulation

摘要

Deposition of large particles such as colloidal or bio-particles on a solid surface isusually modeled by the random sequential adsorption (RSA). The model was previouslydescribed by the integral-equation theory whose validity was proved by Monte Carlo simulation.This work generalized the model to include the concentration effect of added particles on thesurface. The fraction of particles inserted was varied by the reduced number density of 0.05, 0.1,and 0.2. It was found that the modified integral-equation theory yielded the results in goodaccordance with the simulation. Regarding colloidal particles as hard spheres, when the fractionof particles added was increased, the radial distribution function has higher peak, due to thecooperative and entropic effects. This work could bridge the gap between equilibrium adsorption,where all particles may be considered moving and RSA, where there is no moving particle onthe surface. In addition, the effect of attractive interaction was also incorporated and it wasfound that increasing number of added particles at one time yields less values of the radialdistribution function.