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Characterizing Single-Molecule Conformational Changes Under Shear Flow with Fluorescence Microscopy

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Two-dimensional active polar semiflexible polymer under shear flow.

A Lamura¹, R G Winkler²

¹Istituto Applicazioni Calcolo, CNR, Via Amendola 122/D, 70126 Bari, Italy.

The Journal of Chemical Physics

|April 22, 2026

Summary

This summary is machine-generated.

This study explores how semiflexible active polar polymers behave under shear flow. We found that polymer flexibility and activity significantly alter their structure, dynamics, and rheology, even leading to negative viscosity in some conditions.

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Area of Science:

Soft Matter Physics
Polymer Physics
Non-equilibrium Statistical Mechanics

Background:

Active polymers exhibit complex behaviors driven by internal energy conversion.
Semiflexible polymers possess unique structural and dynamical properties due to their rigidity.
Understanding polymer behavior under flow is crucial for materials science and biophysics.

Purpose of the Study:

Investigate the nonequilibrium structural and dynamical properties of semiflexible active polar polymers.
Analyze the impact of linear shear flow on polymer conformation, alignment, and motion.
Determine the role of polymer semiflexibility and activity in rheological properties.

Main Methods:

Numerical simulations using Brownian multiparticle collision dynamics (BMCPD).
Two-dimensional confinement of filaments in a fluid environment.
Analysis of polymer conformation, tumbling dynamics, and scaling exponents.

Main Results:

Shear flow induces conformational changes, alignment, and tumbling motion in polymers.
A characteristic scaling exponent for mean-square end-to-end distance depends on semiflexibility.
Tumbling dynamics show a stronger Weissenberg number dependence than flexible polymers.
Activity significantly impacts rheology, potentially leading to negative viscosity at low flow rates.

Conclusions:

Semiflexible active polar polymers exhibit distinct behaviors under shear flow compared to flexible or passive counterparts.
Polymer semiflexibility and activity are key determinants of their response to external flow.
The study reveals potential for novel rheological properties, including negative viscosity, in active polymer systems.