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From strings to coils: Rotational dynamics of DNA-linked colloidal chains

Steve Kuei, Burke Garza, and Sibani Lisa Biswal

  • Department of Chemical and Biomolecular Engineering, Rice University, Houston, Texas 77005, USA

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Phys. Rev. Fluids 2, 104102 – Published 16 October, 2017

DOI: https://doi.org/10.1103/PhysRevFluids.2.104102

Abstract

We investigate the dynamical behavior of deformable filaments experimentally using a tunable model system consisting of linked paramagnetic colloidal particles, where the persistence length lp, the contour length lc, and the strength and frequency of the external driving force are controlled. We find that upon forcing by an external magnetic field, a variety of structural and conformational regimes exist. Depending on the competition of forces and torques on the chain, we see classic rigid rotator behavior, as well as dynamically rich wagging, coiling, and folding behavior. Through a combination of experiments, computational models, and theoretical calculations, we are able to observe, classify, and predict these dynamics as a function of the dimensionless Mason and magnetoelastic numbers.

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Phys. Rev. Fluids 2, 104102– Published 16 October, 2017
  • Received 1 February 2017
Article part of CHORUS

©2017 American Physical Society

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