title: Aggregation of binary colloidal suspensions on attractive walls.
abstract: The adsorption of colloidal particles from a suspension on a solid surface is of fundamental importance to many physical and biological systems. In this work, Brownian Dynamics simulations are performed to study the aggregation in a suspension of oppositely charged colloidal particles in the presence of an attractive wall. For sufficiently strong attractions, the wall alters the microstructure of the aggregates so that B2 (CsCl-type) structures are more likely obtained instead of B1 (NaCl-type) structures. The probability of forming either B1 or B2 crystallites depends also on the inverse interaction range κa. Suspensions with small κa are more likely to form B2 crystals than suspensions with larger κa, even if the energetic stability of the B2 phase decreases with decreasing κa. The mechanisms underlying this aggregation and crystallization behaviour are analyzed in detail.
authors.affiliation: SPCTS, UMR 7315, ENSCI, CNRS, Centre Européen de la Céramique, 12 rue Atlantis, 87068 Limoges cedex, France and Dipartimento di Fisica, via Dodecaneso 33, 16146, Genova, Italy.
authors.forename: Aleena
authors.initials: A
authors.lastname: Laganapan
authors.affiliation: Dipartimento di Fisica, via Dodecaneso 33, 16146, Genova, Italy.
authors.forename: Davide
authors.initials: D
authors.lastname: Bochicchio
authors.affiliation: SPCTS, UMR 7315, ENSCI, CNRS, Centre Européen de la Céramique, 12 rue Atlantis, 87068 Limoges cedex, France.
authors.forename: Marguerite
authors.initials: M
authors.lastname: Bienia
authors.affiliation: SPCTS, UMR 7315, ENSCI, CNRS, Centre Européen de la Céramique, 12 rue Atlantis, 87068 Limoges cedex, France.
authors.forename: Arnaud
authors.initials: A
authors.lastname: Videcoq
authors.affiliation: Dipartimento di Chimica e Chimica Industriale and CNR-IMEM, via Dodecaneso 31, 16146, Genova, Italy. ferrando@fisica.unige.it.
authors.forename: Riccardo
authors.initials: R
authors.lastname: Ferrando