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  Measuring Electrostatic Double-Layer Forces at High Surface Potentials with the Atomic Force Microscope

Raiteri, R., Grattarola, M., & Butt, H.-J. (1996). Measuring Electrostatic Double-Layer Forces at High Surface Potentials with the Atomic Force Microscope. The Journal of Physical Chemistry, 100(41), 16700-16705. doi:10.1021/jp961549g.

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Genre: Journal Article

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 Creators:
Raiteri, Roberto1, 2, Author              
Grattarola, Massimo2, Author
Butt, Hans-Jürgen1, Author              
Affiliations:
1Department of Biophysical Chemistry, Max Planck Institute of Biophysics, Max Planck Society, ou_2068289              
2DIBE, University of Genova, via Opera Pia 11A, 16145 Genova, Italy, ou_persistent22              

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Free keywords: Surface potential; Electrostatics; Platinum; Gold; Surface interactions
 Abstract: The aim of this study was to measure interaction forces between surfaces with high electric potentials in aqueous electrolyte solutions. Therefore, the force between a platinum or gold sample, which served as the working electrode, and a silicon nitride tip of an atomic force microscope was measured. Various potentials were applied between the sample and a reference electrode. Experimental results were compared to forces calculated with the Poisson−Boltzmann equation. As predicted by theory, the electrostatic double-layer force changed only in a narrow potential range of about 300 mV and saturated below and above this range. Within this range the repulsion grew with more negative sample potentials. This was expected, since the tip was negatively charged at the high pH chosen. At strong negative sample potentials this saturation was not complete and the force continued to rise slightly when lowering the potential. Another surprising and yet unexplained observation was a weak long-range attraction at positive sample potentials. This attraction decayed with a decay length of typically 50 nm. In parallel, the structure of Au(111) was imaged. We confirmed a (√3 × p, p > 10) reconstruction at potentials below about −0.3 VSHE and the normal (1 × 1) hexagonal packing above this potential. Above about +0.8 VSHE the (1 × 1) structure disappeared and no crystalline packing was observed anymore.

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Language(s): eng - English
 Dates: 1996-07-301996-05-291996-10-101996-10-10
 Publication Status: Published in print
 Pages: 6
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1021/jp961549g
 Degree: -

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Title: The Journal of Physical Chemistry
  Abbreviation : J. Phys. Chem.
Source Genre: Journal
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Publ. Info: Washington, D.C. : American Chemical Society
Pages: - Volume / Issue: 100 (41) Sequence Number: - Start / End Page: 16700 - 16705 Identifier: ISSN: 1932-7447
CoNE: https://pure.mpg.de/cone/journals/resource/954926947766_3