Axial Thermal Rotation of Slender Rods

Dichuan Li, Nikta Fakhri, Matteo Pasquali, and Sibani Lisa Biswal
Phys. Rev. Lett. 106, 188302 – Published 3 May 2011
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Abstract

Axial rotational diffusion of rodlike polymers is important in processes such as microtubule filament sliding and flagella beating. By imaging the motion of small kinks along the backbone of chains of DNA-linked colloids, we produce a direct and systematic measurement of axial rotational diffusivity of rods both in bulk solution and near a wall. The measured diffusivities decrease linearly with the chain length, irrespective of the distance from a wall, in agreement with slender-body hydrodynamics theory. Moreover, the presence of small kinks does not affect the chain’s axial diffusivity. Our system and measurements provide insights into fundamental axial diffusion processes of slender objects, which encompass a wide range of entities including biological filaments and linear polymer chains.

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  • Received 19 January 2011

DOI:https://doi.org/10.1103/PhysRevLett.106.188302

© 2011 American Physical Society

Authors & Affiliations

Dichuan Li, Nikta Fakhri, Matteo Pasquali, and Sibani Lisa Biswal*

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

  • *Corresponding author. biswal@rice.edu.

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Issue

Vol. 106, Iss. 18 — 6 May 2011

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