Dynamic ordering of driven spherocylinders in a nonequilibrium suspension of small colloidal spheres

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Physical Review E. 2019, 99(2), 022601. ISSN 2470-0045. eISSN 2470-0053. Available under: doi: 10.1103/PhysRevE.99.022601
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The ordering effects of driven spherocylinder-shaped rods in a colloidal suspension of small spheres confined to a two-dimensional channel geometry are observed via Brownian dynamics simulations without hydrodynamics. To describe the ordering, an order parameter and an expression for a potential of mean force of an equivalent equilibrium system are defined and analyzed. By varying the application point of the external force along the rods and thus the resulting lever, a transition from a preferred orientation parallel to the direction of the force to a preferred orientation perpendicular to the direction of the force was observed. It is shown that this effect can only be found if the spheres and multiple rods are present. Furthermore, a dependency of the order parameter on the absolute value of the force was discovered. The analysis of the potential of mean force further indicates a transition between two different phases of mean orientation. An observation of the flow equilibrium mean velocity in channel direction led to a s-shaped progression regarding the lever dependency, also marking a transition between two states linked to the mean orientation of the rods. A finite size analysis was conducted. Its results indicate that the transition between the two orientation states is a general phenomenon of the observed rod-sphere mixture.

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ISO 690LÜDERS, Anton, Ullrich SIEMS, Peter NIELABA, 2019. Dynamic ordering of driven spherocylinders in a nonequilibrium suspension of small colloidal spheres. In: Physical Review E. 2019, 99(2), 022601. ISSN 2470-0045. eISSN 2470-0053. Available under: doi: 10.1103/PhysRevE.99.022601
BibTex
@article{Luders2019-02-01Dynam-45112,
  year={2019},
  doi={10.1103/PhysRevE.99.022601},
  title={Dynamic ordering of driven spherocylinders in a nonequilibrium suspension of small colloidal spheres},
  number={2},
  volume={99},
  issn={2470-0045},
  journal={Physical Review E},
  author={Lüders, Anton and Siems, Ullrich and Nielaba, Peter},
  note={Article Number: 022601}
}
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