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Related Experiment Videos

Wetting of regularly structured gold surfaces.

Mamdouh E Abdelsalam1, Philip N Bartlett, Timothy Kelf

  • 1School of Chemistry and School of Physics and Astronomy, University of Southampton, Southampton SO17 1BJ, United Kingdom.

Langmuir : the ACS Journal of Surfaces and Colloids
|February 23, 2005
PubMed
Summary

Researchers transformed a hydrophilic gold surface into a hydrophobic one by controlling pore topography. Adjusting gold film thickness on structured surfaces altered water contact angles, demonstrating topography

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Area of Science:

  • Materials Science
  • Surface Science
  • Nanotechnology

Background:

  • Hydrophilic surfaces readily attract water, limiting applications where water repellency is desired.
  • Controlling surface topography is a key strategy for tuning surface wettability.
  • Existing methods often rely on chemical modifications, which can be less durable.

Purpose of the Study:

  • To investigate the wetting behavior of structured gold surfaces with controlled topography.
  • To determine if surface topography alone can induce hydrophobicity on a hydrophilic material.
  • To explore the relationship between pore dimensions and apparent water contact angle.

Main Methods:

  • Fabrication of structured gold surfaces via electrodeposition through colloidal templates.

Related Experiment Videos

  • Systematic variation of gold film thickness to control pore depth and surface topography.
  • Measurement of apparent water contact angles on surfaces with varying pore geometries.

    • Main Results:

    • Apparent water contact angles increased from 70° to over 130° as gold film thickness increased to the pore radius.
    • Contact angles decreased towards 70° with further increases in film thickness.
    • The observed wetting behavior aligned with the Cassie-Baxter model for non-wetted surfaces.
    • Contact angle was independent of pore diameter (400-800 nm).

    Conclusions:

    • Surface topography, specifically pore depth, can effectively transform a hydrophilic gold surface into a hydrophobic one.
    • This study presents the first example of inducing hydrophobicity solely through topographic control on a hydrophilic material.
    • The findings highlight the potential for precise control over surface wettability using nanostructured materials.