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Journal Article

Mobility gradient induces cross-streamline migration of semiflexible polymers

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Steinhauser,  Dagmar
Group Dynamics of biological matter, Department of Dynamics of Complex Fluids, Max Planck Institute for Dynamics and Self-Organization, Max Planck Society;

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Pfohl,  Thomas
Group Dynamics of biological matter, Department of Dynamics of Complex Fluids, Max Planck Institute for Dynamics and Self-Organization, Max Planck Society;

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Citation

Steinhauser, D., Köster, S., & Pfohl, T. (2012). Mobility gradient induces cross-streamline migration of semiflexible polymers. ACS Macro Letters, 1(5), 541-545. doi:10.1021/mz3000539.


Cite as: https://hdl.handle.net/11858/00-001M-0000-002B-80B8-A
Abstract
Many aspects of modern material science and biology rely on the strategic manipulation and understanding of polymer dynamics in confining micro- and nanoflow. We directly observe and analyze nonequilibrium structural and dynamic properties of individual semiflexible actin filaments in pressure-driven microfluidic channel flow using fluorescence microscopy. Different conformational shapes, such as filaments fluctuating in an elongated manner, parabolically bent, as well as tumbling, are identified. With increasing flow velocity, a strong center-of-mass migration toward the channel walls is observed. This significant migration effect can be explained by a shear rate dependent spatial diffusivity due to a gradient in chain mobility of the semiflexible polymers.