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Breaking bonds in the atomic force microscope: theory and analysis.

Felix Hanke1, Hans Jürgen Kreuzer

  • 1Department of Physics and Atmospheric Science, Dalhousie University, Halifax, Nova Scotia, Canada B3H 3J5.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|October 10, 2006
PubMed
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A new theoretical framework analyzes molecular bond breaking in dynamic force spectroscopy. This approach provides accurate physical parameters and refines existing models for atomic force microscopy applications.

Area of Science:

  • Physical Chemistry
  • Biophysics
  • Materials Science

Background:

  • Dynamic force spectroscopy (DFS) probes molecular interactions by applying forces.
  • Atomic force microscopy (AFM) is a key technique for DFS experiments.
  • Understanding molecular bond rupture is crucial in various scientific fields.

Purpose of the Study:

  • To develop a theoretical framework for analyzing molecular bond breaking in DFS.
  • To derive an analytic expression for bond breaking probability as a function of force.
  • To identify optimal experimental conditions for extracting key physical parameters.

Main Methods:

  • Development of a theoretical model for molecular bond rupture dynamics.
  • Derivation of an analytic expression for bond breaking probability.

Related Experiment Videos

  • Analysis of the force-ramp mode in DFS experiments.
  • Comparison with existing models, such as the Ritchie-Evans model.

    • Main Results:

    • An analytic expression for bond breaking probability in terms of physical parameters was obtained.
    • The force-ramp mode, using varied force-loading rates, is optimal for parameter extraction (potential depth and width).
    • The Ritchie-Evans model was found to be incomplete, applicable only at low forces.

    Conclusions:

    • The developed theoretical framework provides a more accurate analysis of molecular bond breaking in DFS.
    • The study highlights the importance of experimental design, particularly the force-ramp mode and loading rates.
    • The findings offer a refined understanding of molecular mechanics and limitations of current models.