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Highly stretched single polymers: atomic-force-microscope experiments versus ab-initio theory.

Thorsten Hugel1, Matthias Rief, Markus Seitz

  • 1Center for Nanoscience, LMU München, Geschwister-Scholl Platz 1, 80799 München, Germany.

Physical Review Letters
|March 24, 2005
PubMed
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Quantum-chemical calculations accurately predict polymer stretching behavior. Single-molecule stretching experiments for DNA, peptides, and polyvinylamine align with ab-initio models, especially at high forces.

Area of Science:

  • Polymer Physics
  • Quantum Chemistry
  • Materials Science

Background:

  • Understanding polymer mechanics at the single-molecule level is crucial for materials science.
  • Bridging experimental single-molecule stretching with theoretical quantum-chemical calculations presents a significant challenge.

Purpose of the Study:

  • To quantitatively compare experimental single-molecule stretching curves with ab-initio calculations.
  • To validate theoretical models for polymer elasticity across different backbone architectures.

Main Methods:

  • Experimental single-molecule force spectroscopy was used to obtain stretching curves.
  • Quantum-chemical ab-initio calculations were performed to model polymer behavior.
  • Freely-rotating-chain models were employed to account for chain fluctuations at lower forces.

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Main Results:

  • High quantitative agreement was achieved between experimental data and theoretical calculations up to two nanonewtons.
  • Polymer contour length emerged as the sole fitting parameter for high-force predictions.
  • Theoretical models successfully incorporated chain fluctuations for improved accuracy at smaller forces.

Conclusions:

  • Ab-initio calculations provide a reliable method for predicting polymer stretching behavior.
  • The study validates the use of theoretical models in conjunction with experimental data for polymer mechanics.
  • This approach offers a powerful tool for designing and understanding novel polymer materials.