ISSN:
1089-7690
Source:
AIP Digital Archive
Topics:
Physics
,
Chemistry and Pharmacology
Notes:
We present a Brownian dynamics simulation study of static and dynamic properties of quasi-two-dimensional dispersions of colloidal spheres interacting by long-range screened electrostatic and by dipolar magnetic forces, respectively. The calculated van Hove real-space dynamic correlation functions, mean squared displacements, and hydrodynamic functions are shown to obey a dynamic scaling behavior in terms of a characteristic relaxation time related to the geometrical mean particle distance. Hydrodynamic interactions introduce a second characteristic length scale, and they lead to a more restricted scaling behavior with an enhancement of self-diffusion. As a consequence of dynamic scaling, the dynamical criterion of Löwen [Phys. Rev. E 53, R29 (1996)] for the onset of colloidal freezing is shown to be equivalent to a two-dimensional freezing criterion related to the static structure factor. © 2001 American Institute of Physics.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.1366637
Permalink