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Confocal Imaging of Confined Quiescent and Flowing Colloid-polymer Mixtures

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Identifying hydrodynamic interaction effects in tethered polymers in uniform flow.

Diego Kienle¹, Roland Rzehak, Walter Zimmermann

¹Theoretische Physik I, Universität Bayreuth, Bayreuth, Germany. diego.kienle@uni-bayreuth.de

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics

|July 30, 2011

Summary

Hydrodynamic interaction (HI) in uniform flow affects tethered polymers. Interchain HI reduces drag and induces polymer attraction, effects verifiable experimentally.

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Area of Science:

Polymer physics
Fluid dynamics
Computational biophysics

Background:

Hydrodynamic interaction (HI) influences polymer behavior in flow.
Understanding HI is crucial for polymer dynamics in solution.

Purpose of the Study:

Investigate the impact of HI on tethered polymers in uniform flow.
Quantify the effects of interchain HI on drag and polymer-polymer interactions.

Main Methods:

Brownian dynamics simulations were employed.
Simulations analyzed tethered polymers in uniform flow conditions.

Main Results:

Interchain HI reduces polymer drag coefficient with decreasing tether separation.
A polymer-polymer attraction emerges, peaking at intermediate flow velocities.
Drag forces of the order of entropic forces drive attraction.

Conclusions:

Hydrodynamic interactions significantly alter tethered polymer behavior.
Observed effects of HI are experimentally verifiable.
HI plays a key role in polymer self-assembly and dynamics in flow.