Contractile actuation and dynamical gel assembly of paramagnetic filaments in fast precessing fields

Joshua M. Dempster, Pablo Vázquez-Montejo, Monica Olvera De La Cruz

Research output: Contribution to journalArticlepeer-review

14 Scopus citations

Abstract

Flexible superparamagnetic filaments are studied under the influence of fast precessing magnetic fields using simulations and a continuum approximation analysis. We find that individual filaments can be made to exert controllable tensile forces along the precession axis. These forces are exploited for microscopic actuation. In bulk, the filaments can be rapidly assembled into different configurations whose material properties depend on the field parameters. The precession frequency affects filament aggregation and conformation by changing the net torques on the filament ends. Using a time-dependent precession angle allows considerable freedom in choosing properties for filament aggregates. As an example, we design a field that twists chains together to dynamically assemble a self-healing gel.

Original languageEnglish (US)
Article number052606
JournalPhysical Review E
Volume95
Issue number5
DOIs
StatePublished - May 12 2017

ASJC Scopus subject areas

  • Statistical and Nonlinear Physics
  • Statistics and Probability
  • Condensed Matter Physics

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