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Single polymer dynamics in an elongational flow

T T Perkins1, D E Smith, S Chu

  • 1Department of Physics, Stanford University, Stanford, CA 94305, USA.

Science (New York, N.Y.)
|June 27, 1997
PubMed
Summary
This summary is machine-generated.

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Individual polymer stretching, like that of DNA, was observed. While some polymers reached steady state, average extension did not, revealing complex dynamics under high strain rates.

Area of Science:

  • Polymer physics
  • Fluid dynamics
  • Biophysics

Background:

  • Understanding polymer behavior in flow is crucial for various applications.
  • Individual polymer dynamics in homogeneous velocity gradients are not fully characterized.

Purpose of the Study:

  • To observe and quantify the stretching of individual polymers in a homogeneous velocity gradient.
  • To determine the probability distribution of molecular extension over time and strain rates.
  • To investigate polymer conformational changes and dynamics at high strain rates.

Main Methods:

  • Utilized fluorescently labeled DNA molecules to visualize individual polymer stretching.
  • Applied a spatially homogeneous velocity gradient to the fluid containing the polymers.
  • Measured molecular extension as a function of time and applied strain rate.

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Main Results:

  • Observed significant variation in the onset of polymer stretching.
  • Found that some polymers reached a steady-state extension, but the average extension did not stabilize.
  • Identified distinct conformational shapes with different dynamics at high strain rates.
  • Noted that polymers did not consistently deform with the fluid element at increased strain rates.

Conclusions:

  • The steady-state extension of polymers can be modeled using a worm-like chain model.
  • However, the average dynamics of polymer stretching under these conditions cannot be fully explained by current models.
  • Polymer behavior deviates from fluid element deformation at high strain rates, indicating complex viscoelastic responses.