title: Depletion-induced structure and dynamics in bimodal colloidal suspensions.
abstract: Combined small angle x-ray scattering and x-ray photon correlation spectroscopy studies of moderately concentrated bimodal hard-sphere colloidal suspensions in the fluid phase show that depletion-induced demixing introduces spatially heterogeneous dynamics with two distinct time scales. The adhesive nature, as well as the mobility, of the large particles is determined by the level of interaction within the monomodal domains. This interaction is driven by osmotic forces, which are governed by the relative concentration of the constituents.
authors.affiliation: Advanced Photon Source, Argonne National Laboratory, Illinois 60439, USA.
authors.forename: M
authors.initials: M
authors.lastname: Sikorski
authors.forename: A R
authors.initials: AR
authors.lastname: Sandy
authors.forename: S
authors.initials: S
authors.lastname: Narayanan
mesh_terms: D003102:Colloids / Q000737:chemistry*; D056004:Molecular Dynamics Simulation; D009997:Osmotic Pressure; D010316:Particle Size; D017785:Photons; D013057:Spectrum Analysis; D013535:Suspensions / Q000737:chemistry*; D013997:Time Factors; D014965:X-Rays
chemical_list: D003102:Colloids; D013535:Suspensions