Clusters in sedimentation equilibrium for an experimental hard-sphere-plus-dipolar Brownian colloidal system

Yethiraj, Anand and Newman, Hugh D. (2015) Clusters in sedimentation equilibrium for an experimental hard-sphere-plus-dipolar Brownian colloidal system. Scientific Reports, 5. ISSN 2045-2322

[img] [English] PDF - Published Version
Available under License Creative Commons Attribution Non-commercial.

Download (1337Kb)

Abstract

In this work, we use structure and dynamics in sedimentation equilibrium, in the presence of gravity, to examine, via confocal microscopy, a Brownian colloidal system in the presence of an external electric field. The zero field equation of state (EOS) is hard sphere without any re-scaling of particle size, and the hydrodynamic corrections to the long-time self-diffusion coefficient are quantitatively consistent with the expected value for hard spheres. Care is taken to ensure that both the dimensionless gravitational energy, which is equivalent to a Peclet number Peg, and dipolar strength Λ are of order unity. In the presence of an external electric field, anisotropic chain-chain clusters form; this cluster formation manifests itself with the appearance of a plateau in the diffusion coefficient when the dimensionless dipolar strength Λ ~ 1. The structure and dynamics of this chain-chain cluster state is examined for a monodisperse system for two particle sizes.

Item Type: Article
URI: http://research.library.mun.ca/id/eprint/11887
Item ID: 11887
Additional Information: Memorial University Open Access Author's Fund
Department(s): Science, Faculty of > Physics and Physical Oceanography
Date: 1 September 2015
Date Type: Publication
Related URLs:

Actions (login required)

View Item View Item

Downloads

Downloads per month over the past year

View more statistics