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

Scientific Reports
Hugh D Newman, Anand Yethiraj

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.

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Citations

Mar 30, 2017·Chemical Communications : Chem Comm·M Gerth, I K Voets
Sep 19, 2018·Proceedings of the National Academy of Sciences of the United States of America·Kyohei Takae, Hajime Tanaka
Apr 19, 2021·Journal of Colloid and Interface Science·Tom GuhraKai Uwe Totsche

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Methods Mentioned

BETA
confocal microscopy
optical microscopy

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