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Related Experiment Videos

Long-range attraction between charge-mosaic surfaces across water.

Susan Perkin1, Nir Kampf, Jacob Klein

  • 1Physical and Theoretical Chemistry Laboratory, Oxford University, Oxford OX1 3QZ, United Kingdom.

Physical Review Letters
|February 21, 2006
PubMed
Summary

We measured forces between charged surfaces in water. A strong attraction was found between oppositely charged domains, even at large distances, suggesting new possibilities for controlling surface interactions.

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Area of Science:

  • Colloid and Surface Science
  • Electrochemistry
  • Physical Chemistry

Background:

  • Understanding forces between charged surfaces in aqueous environments is crucial for various applications.
  • Hydrophilic surfaces with patterned charges present unique interaction profiles.
  • Previous studies have explored electrostatic interactions, but direct force measurements in complex charge patterns are limited.

Purpose of the Study:

  • To directly measure the forces between hydrophilic surfaces patterned with a mosaic of positive and negative charged domains.
  • To investigate the influence of salt concentration on these forces.
  • To elucidate the mechanisms behind the observed attractions.

Main Methods:

  • Direct force measurements using surface force apparatus.

Related Experiment Videos

  • Utilizing hydrophilic substrates with controlled, random mosaic patterns of positive and negative charges.
  • Varying salt concentrations in the aqueous medium during measurements.

    • Main Results:

    • A strong, long-ranged attraction was observed between the charged surfaces.
    • The attraction's range was comparable to the charge domain size at low salt concentrations.
    • The attraction persisted at higher salt concentrations, with its range becoming similar to the Debye screening length.

    Conclusions:

    • The observed attraction is attributed to correlated interactions between oppositely charged regions on opposing surfaces.
    • Lateral mobility of charge patches on the surfaces plays a key role in facilitating this attraction.
    • These findings offer insights into controlling interfacial forces in complex charged systems.