title: Short-time diffusivity of dicolloids.
abstract: The short-time diffusivity of dicolloid particles as a function of particle volume fraction ϕ from 0.01 ≤ ϕ ≤ 0.6 is measured using diffusing wave spectroscopy. The diffusivities of symmetric and asymmetric dicolloids are compared with similarly sized spheres. The short-time diffusivity is independent of salt concentration and decreases with increasing volume fraction for both spheres and asymmetric dicolloids. Symmetric dicolloids have a higher diffusivity than spheres at similar volume fractions. This difference is accounted for by rescaling the dicolloid volume fraction based on the ratio of the random close-packing volume fractions of spheres and dicolloids. Finally, a useful method is provided for calculating the diffusivity of symmetric dicolloid particles of arbitrary aspect ratio based on the calculated hydrodynamic resistance of Zabarankin [Proc. R. Soc. A 463, 2329 (2007)].
authors.affiliation: Department of Chemical and Biomolecular Engineering and Center for Molecular and Engineering Thermodynamics, Allan P. Colburn Laboratory, 150 Academy Street, University of Delaware, Newark, Delaware 19716, USA.
authors.forename: Mark M
authors.initials: MM
authors.lastname: Panczyk
authors.affiliation: Department of Chemical and Biomolecular Engineering and Center for Molecular and Engineering Thermodynamics, Allan P. Colburn Laboratory, 150 Academy Street, University of Delaware, Newark, Delaware 19716, USA.
authors.forename: Norman J
authors.initials: NJ
authors.lastname: Wagner
authors.affiliation: Department of Chemical and Biomolecular Engineering and Center for Molecular and Engineering Thermodynamics, Allan P. Colburn Laboratory, 150 Academy Street, University of Delaware, Newark, Delaware 19716, USA.
authors.forename: Eric M
authors.initials: EM
authors.lastname: Furst
mesh_terms: D003102:Colloids / Q000737:chemistry*; D003198:Computer Simulation; D004058:Diffusion; D008027:Light; D008855:Microscopy, Electron, Scanning; D008956:Models, Chemical; D010316:Particle Size; D011189:Potassium Chloride / Q000737:chemistry; D012542:Scattering, Radiation; D013057:Spectrum Analysis; D013995:Time; D014867:Water / Q000737:chemistry
chemical_list: D003102:Colloids; D014867:Water; D011189:Potassium Chloride