Entropic barriers in nanoscale adhesion studied by variable temperature chemical force microscopy

Aleksandr Noy, Salvador Zepeda, Christine A. Orme, Yin Yeh, James J. De Yoreo

Research output: Contribution to journalArticle

35 Citations (Scopus)

Abstract

Intermolecular interactions drive the vast majority of condensed phase phenomena from molecular recognition to protein folding to particle adhesion. Complex energy barriers encountered in these interactions include contributions from van der Waals forces, hydrogen bonding, and solvent medium. With the spectacular exception of hydrophobic interactions, contributions from the medium are usually considered secondary. We report a variable temperature force microscopy study of the interactions between several hydrogen bonds in different solvents that challenges this point of view. Surprisingly, we observed an increase in the strength of the interaction between carboxylic acid groups in ethanol as the temperature increased. Moreover, when we switched to a nonpolar solvent we observed the opposite behavior: The binding force decreased as the temperature increased. Kinetic model of bond dissociation provided quantitative interpretation of our measurements. We attributed the observed phenomena to a large entropic contribution from the ordered solvent layers that are forming on the probe and sample surfaces upon detachment. The observed reversal in the force vs temperature trend is a manifestation of a transition between thermodynamic and kinetic regimes of unbinding predicted by the model. Our results indicate that entropic barriers dominated by the interactions of solvent molecules with the surface exist in a much wider variety of systems than previously thought.

Original languageEnglish (US)
Pages (from-to)1356-1362
Number of pages7
JournalJournal of the American Chemical Society
Volume125
Issue number5
DOIs
StatePublished - Feb 5 2003
Externally publishedYes

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Atomic Force Microscopy
Microscopic examination
Adhesion
Temperature
Hydrogen bonds
Protein folding
Molecular recognition
Van der Waals forces
Kinetics
Energy barriers
Protein Folding
Hydrogen Bonding
Carboxylic Acids
Hydrophobic and Hydrophilic Interactions
Carboxylic acids
Thermodynamics
Hydrogen
Ethanol
Molecules

ASJC Scopus subject areas

  • Chemistry(all)

Cite this

Entropic barriers in nanoscale adhesion studied by variable temperature chemical force microscopy. / Noy, Aleksandr; Zepeda, Salvador; Orme, Christine A.; Yeh, Yin; De Yoreo, James J.

In: Journal of the American Chemical Society, Vol. 125, No. 5, 05.02.2003, p. 1356-1362.

Research output: Contribution to journalArticle

Noy, Aleksandr ; Zepeda, Salvador ; Orme, Christine A. ; Yeh, Yin ; De Yoreo, James J. / Entropic barriers in nanoscale adhesion studied by variable temperature chemical force microscopy. In: Journal of the American Chemical Society. 2003 ; Vol. 125, No. 5. pp. 1356-1362.
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