title: Monte Carlo simulation of particle aggregation and gelation: II. Pair correlation function and structure factor.
abstract: Diffusion-limited cluster aggregation and gelation are studied using lattice and off-lattice Monte Carlo simulations. The pair correlation function g(r) and the structure factor S(q) of the particle gels were investigated as a function of the volume fraction (05-49%) and time. At volume fractions below 5%, the gel structure is fractal on small length scales with d(f) = 1.8. g(r) shows a weak minimum at the correlation length (xi), before reaching the average concentration at large length scales. The cut-off function of g(r) varies during the aggregation process, but at a given t/t(g), where t(g) is the gel time, it is a universal function of r/xi. At high volume fractions, the structure is dominated by excluded-volume interactions, while at low volume fractions, it is determined by the connectivity.
authors.affiliation: Polyméres Colloïdes Interfaces, UMR CNRS, Université du Maine, F-72085 Le Mans cedex 9, France.
authors.forename: M
authors.initials: M
authors.lastname: Rottereau
authors.forename: J C
authors.initials: JC
authors.lastname: Gimel
authors.forename: T
authors.initials: T
authors.lastname: Nicolai
authors.forename: D
authors.initials: D
authors.lastname: Durand
mesh_terms: D016000:Cluster Analysis; D004058:Diffusion; D005782:Gels / Q000737:chemistry*; D009010:Monte Carlo Method; D010316:Particle Size; D044367:Phase Transition; D013997:Time Factors
chemical_list: D005782:Gels