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Issue 48, 2017
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Translational and rotational dynamics in dense suspensions of smooth and rough colloids

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Abstract

We demonstrate that colloidal particles with surface roughness exhibit hindered rotational diffusion in quiescent dense suspensions. This is accomplished by the use of confocal microscopy and particle tracking to follow the translational and rotational dynamics of smooth and rough colloids suspended in a refractive index and density matched organic solvent. Measurement of the three-dimensional rotational diffusion is enabled by the addition of inert Janus tracers made of native colloids coated with a thin layer of aluminum. These experiments show that the mean square displacement (MSD) is unaffected by particle roughness, while the mean square angular displacement (MSAD) decreases for rough colloids at high volume fractions. Our results quantify the slowdown in the rotational dynamics of rough colloids, which is evidently due to steric frustration caused by the surface topography of the particles.

Graphical abstract: Translational and rotational dynamics in dense suspensions of smooth and rough colloids

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Publication details

The article was received on 27 Oct 2017, accepted on 21 Nov 2017 and first published on 04 Dec 2017


Article type: Paper
DOI: 10.1039/C7SM02115A
Citation: Soft Matter, 2017,13, 9229-9236
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    Translational and rotational dynamics in dense suspensions of smooth and rough colloids

    L. C. Hsiao, I. Saha-Dalal, R. G. Larson and M. J. Solomon, Soft Matter, 2017, 13, 9229
    DOI: 10.1039/C7SM02115A

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