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Surfaces designed for charge reversal.

James R Matthews1, Dönüs Tuncel, Robert M J Jacobs

  • 1Contribution from the Department of Chemistry, University of Oxford, South Parks Road, Oxford, OX1 3QY, UK. harry.anderson@chemistry.ox.ac.uk

Journal of the American Chemical Society
|June 6, 2003
PubMed
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Researchers developed pH-responsive surfaces that switch charge from positive to negative. This controlled surface charge is reversible and useful for electrostatic self-assembly applications.

Area of Science:

  • Materials Science
  • Surface Chemistry
  • Nanotechnology

Background:

  • Controlling surface charge is crucial for applications like self-assembly and separations.
  • Developing materials with tunable surface properties is an ongoing challenge in nanotechnology.

Purpose of the Study:

  • To create surfaces with pH-switchable charge properties.
  • To investigate the influence of linker length on charge-reversal behavior.
  • To explore the potential of these surfaces for electrostatic self-assembly.

Main Methods:

  • Functionalization of silica and gold substrates with aminodicarboxylic acid units.
  • Monitoring dye adsorption (cationic and anionic) using UV-vis absorption and reflection spectroscopy across a pH range.
  • Characterization of gold surfaces with varying disulfide linker lengths.

Related Experiment Videos

  • Investigating reversible and irreversible proton-triggered charge switching.

    • Main Results:

    • Surfaces demonstrated reversible charge switching from cationic (pH < 3) to anionic (pH > 5).
    • Dye adsorption behavior confirmed the pH-dependent surface charge.
    • Longer linkers on gold surfaces resulted in narrower pH ranges for charge reversal.
    • Functionalized gold surfaces exhibited significantly faster adsorption kinetics compared to silica.
    • Reversible and irreversible charge switching mechanisms were demonstrated.

    Conclusions:

    • Developed versatile surfaces with tunable, pH-dependent charge.
    • Demonstrated the utility of these surfaces for controlling electrostatic interactions.
    • Highlighted the potential for advanced applications in self-assembly and surface modification.