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Scaling in Force Spectroscopy of Macromolecules

Authors
Journal
Physical Review E
1539-3755
Publisher
American Physical Society
Publication Date
Volume
72
Issue
1
Identifiers
DOI: 10.1103/physreve.72.011918

Abstract

We use molecular dynamics to determine the force needed to rupture a chain molecule being stretched at constant loading rate and temperature. When all energy bonds of the molecule are identical, we find that the force F depends on the pulling rate r and temperature T according to F~const-T¹⁄³ |1n(r/T) |¹⁄³. When a single weak bond is introduced, this result is modified to F~const-T²⁄³ |1n(r/T) |²⁄³ . This scaling, which is model independent, can be used with experiment to quantitatively extract relevant microscopic parameters.

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