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Related Experiment Video

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Studying Large Amplitude Oscillatory Shear Response of Soft Materials

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Published on: April 25, 2019

Detailed scaling analysis of low-force polyelectrolyte elasticity.

D B McIntosh¹, N Ribeck, O A Saleh

¹Physics Department, University of California, Santa Barbara, California 93106, USA.

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

|November 13, 2009

Summary

We reveal how polymer self-avoidance affects single-molecule DNA elasticity, linking experimental data to polymer scaling theories. Our findings challenge existing models and provide new insights into polymer behavior under force.

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Area of Science:

Polymer Physics
Biophysics
Materials Science

Background:

Single-molecule force-extension measurements are crucial for understanding polymer behavior.
Existing models often simplify polymers by neglecting self-avoidance effects.
Single-stranded DNA (ssDNA) serves as a model polymer for these investigations.

Purpose of the Study:

To establish a connection between single-molecule force-extension data and polymer scaling theories, specifically addressing self-avoidance.
To investigate the influence of salt concentration on DNA elasticity and polymer parameters.
To re-evaluate established theories like Odijk-Skolnick-Fixman (OSF) and identify the polymer's Theta point.

Main Methods:

Performed single-molecule force-extension experiments on chemically denatured single-stranded DNA.
Analyzed force-extension data using power-law relationships and compared it with the tensile-blob model.
Systematically varied salt concentration to observe its effect on elasticity and polymer properties.

Main Results:

Observed a low-force elasticity regime where DNA extension follows L ~ f^gamma, with gamma ~ 0.60-0.69, consistent with the self-avoiding tensile-blob model (gamma=2/3).
Demonstrated that the transition from this regime is salt-dependent, correlating Kuhn length and excluded-volume parameter with Debye length.
Identified a Theta point at ~3 M salt where elasticity becomes linear (gamma=1), yielding a bare persistence length of ~0.6 nm via the wormlike chain model.

Conclusions:

The tensile-blob model accurately describes the self-avoiding behavior of ssDNA under force, refining our understanding beyond ideal polymer models.
The Kuhn length of ssDNA is linearly proportional to the Debye length, contradicting the OSF theory's predictions.
The study establishes a framework for interpreting single-molecule polymer elasticity, including the identification of a Theta point and estimation of fundamental polymer parameters.