Near-equilibrium chemical force microscopy

Raymond W. Friddle; Paul Podsiadlo; Alexander B. Artyukhin; Aleksandr Noy

doi:10.1021/jp7095967

Near-equilibrium chemical force microscopy

Raymond W. Friddle, Paul Podsiadlo, Alexander B. Artyukhin, Aleksandr Noy

Research output: Contribution to journal › Article

41 Scopus citations

Abstract

Molecular force spectroscopy experiments probe the stochastic kinetics of individual intermolecular bond rupture under external loading. While there are numerous examples describing rupture kinetics under fast-loading, far from equilibrium conditions, bond rupture at slow loading rates near equilibrium conditions is seldom explored. We use an analytical and numerical approach to show that rupture forces in this qualitatively different regime reach an equilibrium plateau value that is a function of the probe stiffness and the free energy difference between the bound and dissociated state of the bond. Chemical force microscopy measurements of the interaction between a small number of well-defined COOH functional groups confirm these predictions and show the expected scaling of the force plateau values with the square root of the probe stiffness. Finally, we discuss the implications of these results for the interpretation of force spectroscopy experiments.

Original language	English (US)
Pages (from-to)	4986-4990
Number of pages	5
Journal	Journal of Physical Chemistry C
Volume	112
Issue number	13
DOIs	https://doi.org/10.1021/jp7095967
State	Published - Apr 3 2008
Externally published	Yes

ASJC Scopus subject areas

Physical and Theoretical Chemistry
Electronic, Optical and Magnetic Materials
Surfaces, Coatings and Films
Energy(all)

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10.1021/jp7095967

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Friddle, R. W., Podsiadlo, P., Artyukhin, A. B., & Noy, A. (2008). Near-equilibrium chemical force microscopy. Journal of Physical Chemistry C, 112(13), 4986-4990. https://doi.org/10.1021/jp7095967

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AB - Molecular force spectroscopy experiments probe the stochastic kinetics of individual intermolecular bond rupture under external loading. While there are numerous examples describing rupture kinetics under fast-loading, far from equilibrium conditions, bond rupture at slow loading rates near equilibrium conditions is seldom explored. We use an analytical and numerical approach to show that rupture forces in this qualitatively different regime reach an equilibrium plateau value that is a function of the probe stiffness and the free energy difference between the bound and dissociated state of the bond. Chemical force microscopy measurements of the interaction between a small number of well-defined COOH functional groups confirm these predictions and show the expected scaling of the force plateau values with the square root of the probe stiffness. Finally, we discuss the implications of these results for the interpretation of force spectroscopy experiments.

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