Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 431316
Title Direct measurement of the strength of single ionic bonds between hydrated charges
Author(s) Spruijt, E.; Berg, S.A. van den; Cohen Stuart, M.A.; Gucht, J. van der
Source ACS Nano 6 (2012)6. - ISSN 1936-0851 - p. 5297 - 5303.
DOI https://doi.org/10.1021/NN301097Y
Department(s) Physical Chemistry and Colloid Science
WIMEK
Publication type Refereed Article in a scientific journal
Publication year 2012
Keyword(s) molecule force spectroscopy - microscopy - afm - proteins - dna - complexes - chromatin - brushes - chains
Abstract The strength of ionic bonds is essentially unknown, despite their widespread occurrence in natural and man-made assemblies. Here, we use single-molecule force spectroscopy to measure their strength directly. We disrupt a complex between two oppositely charged polyelectrolyte chains and find two modes of rupture: one ionic bond at a time, or cooperative rupture of many bonds at once. For both modes, disruption of the ionic bonds can be described quantitatively as an activated process. The height of the energy barrier is not only lowered by added salt, but also by the applied force. We extract unperturbed ionic bond lifetimes that range from milliseconds for single ionic bonds at high salt concentration to tens of years for small complexes of five ionic bonds at low salt concentration.
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