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Issue 25, 2013
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Dynamic phases of colloidal monolayers sliding on commensurate substrates

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Abstract

We report on numerical simulations of a monolayer of charge-stabilized colloids driven over a substrate potential by an external dc force acting along a symmetry axis of the monolayer. Using overdamped Langevin dynamics, we studied the sliding transition for various inter-particle interaction strengths as a function of the driving force. For weak interactions, the diffusion of individual defects is responsible for the motion of the monolayer. As the interaction strength is increased, sliding is induced by distinct density compression and decompression zones. For very strong interactions, a type of stick-slip mechanism emerges, in which the sliding of the monolayer is mediated by the propagation of collective distortion waves. Our predictions can be tested experimentally with two-dimensional arrangements of colloidal particles exposed to periodic light fields and our work shows that the inter-particle interaction strength tunes the degree of correlation in the sliding mechanism adopted by a monolayer driven over a commensurate substrate.

Graphical abstract: Dynamic phases of colloidal monolayers sliding on commensurate substrates

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Publication details

The article was received on 12 Feb 2013, accepted on 05 Apr 2013 and first published on 29 Apr 2013


Article type: Paper
DOI: 10.1039/C3SM50458A
Citation: Soft Matter, 2013,9, 5867-5873
  • Open access: Creative Commons BY-NC license
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    Dynamic phases of colloidal monolayers sliding on commensurate substrates

    J. Hasnain, S. Jungblut and C. Dellago, Soft Matter, 2013, 9, 5867
    DOI: 10.1039/C3SM50458A

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