Description: Brownian dynamics study of dynamic scaling and related freezing criteria in quasi-two-dimensional dispersions

This title appears in the Scientific Report : 2001

Brownian dynamics study of dynamic scaling and related freezing criteria in quasi-two-dimensional dispersions

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,...

Personal Name(s):	Pesche, R.
	Kollmann, M. / Nägele, G.
Contributing Institute:	Weiche Materie; IFF-WM
Published in:	The @journal of chemical physics, 114 (2001) S. 8701 - 8707
Imprint:	Melville, NY American Institute of Physics 2001
Physical Description:	8701 - 8707
Document Type:	Journal Article
Research Program:	Polymere, Membranen und komplexe Flüssigkeiten
Series Title:	Journal of Chemical Physics 114
Subject (ZB):	J
Link:	OpenAccess
	Publikationsportal JuSER

Please use the identifier: http://hdl.handle.net/2128/1609 in citations.

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 Lowen [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. (C) 2001 American Institute of Physics.