title: Evidence for an unusual dynamical-arrest scenario in short-ranged colloidal systems.
abstract: Extensive molecular dynamics simulation studies of particles interacting via a short-ranged attractive square-well potential are reported. The calculated loci of constant diffusion coefficient D in the temperature-packing fraction plane show a reentrant behavior, i.e., an increase of diffusivity on cooling, confirming an important part of the high volume-fraction dynamical-arrest scenario earlier predicted by theory for particles with short-ranged potentials. The more efficient localization mechanism induced by the short-range bonding provides, on average, additional free volume as compared to the hard-sphere case and results in faster dynamics.
authors.affiliation: Irish Centre for Colloid Science and Biomaterials, Department of Chemistry, University College Dublin, Belfield, Dublin 4, Ireland.
authors.forename: G
authors.initials: G
authors.lastname: Foffi
authors.forename: K A
authors.initials: KA
authors.lastname: Dawson
authors.forename: S V
authors.initials: SV
authors.lastname: Buldyrev
authors.forename: F
authors.initials: F
authors.lastname: Sciortino
authors.forename: E
authors.initials: E
authors.lastname: Zaccarelli
authors.forename: P
authors.initials: P
authors.lastname: Tartaglia