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Issue 17, 2013
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Structural arrest and texture dynamics in suspensions of charged colloidal rods

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Abstract

There is an abundance of experiments and theories on the glass transition of colloidal systems consisting of spherical particles. Much less is known about possible glass transitions in suspensions of rod-like colloids. In this study we present observations of a glass transition in suspensions of very long and thin rod-like, highly charged colloids. We use as a model system fd-virus particles (a DNA strand covered with coat proteins) at low ionic strength, where thick electric double layers are present. Structural arrest as a result of particle-caging is observed by means of dynamic light scattering. The glass-transition concentration is found to be far above the isotropic–nematic coexistence region. The morphology of the system thus consists of nematic domains with different orientations. Below the glass-transition concentration the initial morphology with large shear-aligned domains breaks up into smaller domains, and equilibrates after typically 50–100 hours. We quantify the dynamics of the transitional and the equilibrated texture by means of image time-correlation. A sharp increase of relaxation times of image time-correlation functions is found at the glass-transition concentration. The texture dynamics thus freezes at the same concentration where structural arrest occurs. We also observe a flow instability, which sets in after very long waiting times (typically 200–300 hours), depending on the rod concentration, which affects the texture morphology.

Graphical abstract: Structural arrest and texture dynamics in suspensions of charged colloidal rods

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Publication details

The article was received on 29 Nov 2012, accepted on 31 Jan 2013 and first published on 26 Feb 2013


Article type: Paper
DOI: 10.1039/C3SM27754B
Citation: Soft Matter, 2013,9, 4401-4411
  • Open access: Creative Commons BY license
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    Structural arrest and texture dynamics in suspensions of charged colloidal rods

    K. Kang and J. K. G. Dhont, Soft Matter, 2013, 9, 4401
    DOI: 10.1039/C3SM27754B

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