Issue 48, 2017
From the journal:

Soft Matter

Translational and rotational dynamics in dense suspensions of smooth and rough colloids†

Lilian C. Hsiao, ORCID logo *a   Indranil Saha-Dalal,‡b   Ronald G. Larsonb  and  Michael J. Solomonb  

* Corresponding authors

a Department of Chemical and Biomolecular Engineering, North Carolina State University, Raleigh, NC 27695, USA
E-mail: lilian_hsiao@ncsu.edu

b Department of Chemical Engineering, University of Michigan, Ann Arbor, MI, USA

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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Article information

DOI
https://doi.org/10.1039/C7SM02115A
Article type
Paper
Submitted
27 Oct 2017
Accepted
21 Nov 2017
First published
04 Dec 2017

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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