Heteroaggregation between Al2O3 submicrometer particles and SiO2 nanoparticles : experiment and simulation

Manuella Cerbelaud (1) , Arnaud Videcoq (2) , Pierre Abelard (1) , Cécile Pagnoux (2) , Fabrice Rossignol (2) , R. Ferrando (3)

1 SPCTS - Science des Procédés Céramiques et de Traitements de Surface
2 Axe 1 : procédés céramiques
3 UniGe - Università degli studi di Genova = University of Genoa

The aggregation process of a two-component dilute system (3 vol %), made of alumina submicrometer particles and silica nanoparticles, is studied by Brownian dynamics simulations. Alumina and silica particles have very different sizes (diameters of 400 and 25 nm, respectively). The particle-particle interaction potential is of the DLVO form. The parameters of the potential are extracted from the experiments. The simulations show that the experimentally observed aggregation phenomena between alumina particles are due to the silica-alumina attraction that induces an effective driving force for alumina-alumina aggregation. The experimental data for silica adsorption on alumina are very well reproduced.

Manuella Cerbelaud, Arnaud Videcoq, Pierre Abelard, Cécile Pagnoux, Fabrice Rossignol, et al.. Heteroaggregation between Al2O3 submicrometer particles and SiO2 nanoparticles : experiment and simulation. Langmuir, 2008, 24, pp.3001-3008. ⟨10.1021/la702104u⟩. ⟨hal-00269276⟩