English

Bidirectional Zigzag Growth from Clusters of Active Colloidal Shakers

Soft Condensed Matter 2024-04-19 v1

Abstract

Driven or self-propelling particles moving in viscoelastic fluids recently emerge as novel class of active systems showing a complex yet rich set of phenomena due to the non-Newtonian nature of the dispersing medium. Here we investigate the one-dimensional growth of clusters made of active colloidal shakers, which are realized by oscillating magnetic rotors dispersed within a viscoelastic fluid and at different concentration of the dissolved polymer. These magnetic particles when actuated by an oscillating field display a flow profile similar to that of a shaker force dipole, i.e. without any net propulsion. We design a protocol to assemble clusters of colloidal shakers and induce their controlled expansion into elongated zigzag structures. We observe a power law growth of the mean chain length and use theoretical arguments to explain the measured 1/31/3 exponent. These arguments agree well with both experiments and particle based numerical simulations.

Keywords

Cite

@article{arxiv.2402.02939,
  title  = {Bidirectional Zigzag Growth from Clusters of Active Colloidal Shakers},
  author = {Gaspard Junot and Andrés Javier Manzano González and Pietro Tierno},
  journal= {arXiv preprint arXiv:2402.02939},
  year   = {2024}
}