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Modifying surface forces through control of surface potentials.

Ran Tivony1, Jacob Klein1

  • 1Department of Materials and Interfaces, Weizmann Institute of Science, Rehovot, 76100, Israel. Jacob.klein@weizmann.ac.il.

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|April 25, 2017
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Summary
This summary is machine-generated.

Controlling the electrical potential of gold surfaces alters adhesion with mica. Researchers found adhesion can be reversibly switched on and off by changing the gold surface potential, impacting interfacial interactions.

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Area of Science:

  • Surface science
  • Electrochemistry
  • Materials science

Background:

  • Interfacial phenomena are crucial in many scientific and technological applications.
  • Direct surface force measurements combined with in situ surface potential regulation offer unique insights into interfacial behavior.
  • Previous work demonstrated potential-dependent surface charge variation at a gold-water interface approaching mica.

Purpose of the Study:

  • To investigate the potential-dependent adhesion and interaction between gold and mica surfaces.
  • To examine the influence of external voltages and electrolyte solutions on these interactions.
  • To understand the underlying mechanisms governing adhesion energy variations.

Main Methods:

  • Utilizing a surface force balance (SFB) integrated with a three-electrode electrochemical cell.
  • Measuring normal interactions between gold and mica surfaces under controlled surface potential regulation.
  • Conducting experiments in both deionized water (no added salt) and electrolyte solutions.

Main Results:

  • Identified three distinct interaction regimes: pure attraction, non-monotonic interaction (electrostatic repulsion to attraction due to charge inversion), and pure repulsion.
  • Observed significant potential-dependent variation in adhesion energy, more pronounced in electrolyte solutions.
  • Demonstrated reversible switching of adhesion between gold and mica by altering the gold surface potential.

Conclusions:

  • Adhesion energy variation is attributed to the interplay between electrostatic and van der Waals (vdW) forces.
  • The difference in adhesion behavior between salt-free and electrolyte solutions is linked to weaker vdW interactions in electrolytes.
  • Reversible adhesion control is achievable, suggesting the formation of strong electric fields at the interface during contact.