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Ambient-mediated wetting on smooth surfaces.

Daniel Orejon1, Junho Oh2, Daniel J Preston3

  • 1School of Engineering, Institute for Multiscale Thermofluids, The University of Edinburgh, Edinburgh EH9 3FD, Scotland, UK; International Institute for Carbon-Neutral Energy Research (WPI-I2CNER), Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan.

Advances in Colloid and Interface Science
|January 14, 2024
PubMed
Summary
This summary is machine-generated.

Smooth solid surfaces intrinsically attract water, but environmental organic compounds cause a transition to water-repelling (hydrophobic) behavior. This study explores the mechanisms and implications of this wettability change.

Keywords:
AdsorptionAtmosphere mediated wettabilityContact angle hysteresisSurface physicalchemistryVolatile organic compounds

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Area of Science:

  • Interfacial Science
  • Physical Chemistry
  • Materials Science

Background:

  • Surface wettability and condensation mechanisms are influenced by organic contaminants.
  • Recent research highlights a renewed debate on the role of contamination in surface properties.
  • The intrinsic wettability of materials like rare earth oxides has been controversially reported.

Purpose of the Study:

  • To demonstrate the intrinsic hydrophilic nature of various smooth solid surfaces.
  • To investigate the transition from hydrophilic to hydrophobic states due to volatile organic compound adsorption.
  • To analyze the impact of these wetting transitions on droplet adhesion and pinning.

Main Methods:

  • Review and analysis of current research on surface wettability.
  • Investigation of adsorption mechanisms, kinetics, and selectivity of organic compounds.
  • Development of a figure of merit mapping wettability against ambient exposure and carbon content.

Main Results:

  • Metals, rare earth oxides, and other smooth materials are intrinsically hydrophilic.
  • A transition to hydrophobicity occurs over hours to days due to volatile organic compound adsorption.
  • Wetting transitions are influenced by substrate material, structure, and ambient exposure.

Conclusions:

  • Surface contamination by organic compounds significantly alters wettability.
  • Understanding these wetting transitions is crucial for applications in engineering and interfacial science.
  • Further research is needed to fully elucidate the mechanisms governing surface contamination and wettability changes.