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Issue 6, 2015
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Effect of confinement on the mode dynamics of dipole clusters

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Abstract

Dynamical properties of colloidal clusters composed of paramagnetic beads are presented. The clusters were trapped either in a parabolic trough or in a hard-wall confinement. In order to access the dynamics of the ensembles, the instantaneous normal mode (INM) approach is utilized, which uses cluster configurations as an input. The peaks in the mode spectra weaken when the system size is increased and when the coupling strength is lowered. The short-time diffusive properties of the clusters are deduced using the INM technique. It is found that angular diffusion is always larger than radial diffusion regardless of the shape of the external trap. Further, short-time diffusion seems to be almost independent of the coupling strength in the solid regime, but decreases with increasing packing fraction and size of the ensembles. In general, it is found that diffusion is larger for parabolically confined than for hard-wall trapped clusters.

Graphical abstract: Effect of confinement on the mode dynamics of dipole clusters

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Article information


Submitted
23 Oct 2014
Accepted
15 Dec 2014
First published
17 Dec 2014

Soft Matter, 2015,11, 1197-1207
Article type
Paper

Effect of confinement on the mode dynamics of dipole clusters

A. Schella, A. Melzer, C. July and C. Bechinger, Soft Matter, 2015, 11, 1197
DOI: 10.1039/C4SM02333A

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