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Fabrication of Superhydrophobic Metal Surfaces for Anti-Icing Applications
11:20

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Published on: August 15, 2018

Electrokinetics on superhydrophobic surfaces.

Periklis Papadopoulos1, Xu Deng, Doris Vollmer

  • 1Max Planck Institute for Polymer Research, Ackermannweg 10, D-55128 Mainz, Germany. papadopoulos@mpip-mainz.mpg.de

Journal of Physics. Condensed Matter : an Institute of Physics Journal
|November 2, 2012
PubMed
Summary
This summary is machine-generated.

Superhydrophobic surfaces show reduced wall friction but also low charge density, impacting electro-osmotic mobility. Experiments reveal electrophoresis dominates over electro-osmosis on these surfaces.

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Area of Science:

  • Surface science
  • Colloid science
  • Electrokinetics

Background:

  • Superhydrophobic surfaces offer reduced friction but possess low surface charge density.
  • The interplay between reduced friction and low charge density on electrokinetic mobility remains unclear.
  • Experimental data is needed to determine the dominant factor influencing electrokinetic mobilities.

Purpose of the Study:

  • To experimentally separate the contributions of electrophoresis and electro-osmosis on superhydrophobic surfaces.
  • To investigate how surface properties, including charge density and hydrophilicity, affect colloid mobility.
  • To understand the electrokinetic behavior of colloids on different surface types.

Main Methods:

  • Measurement of electrokinetic mobilities of negatively charged polystyrene colloids.
  • Utilized confocal laser scanning electron microscopy for analysis.
  • Employed hydrophilic, superhydrophobic (Cassie), and partially hydrophilized (Cassie composite) surfaces with varying charge densities and signs.

Main Results:

  • Electro-osmosis was found to be minimal compared to electrophoresis on superhydrophobic and negatively charged Cassie composite surfaces.
  • Positively charged Cassie composite surfaces exhibited reduced colloid mobility due to electrostatic attraction and surface roughness.
  • The charge density or slip length on Cassie composite surfaces was insufficient to enhance electro-osmosis.

Conclusions:

  • Electrophoresis is the dominant electrokinetic mechanism on superhydrophobic surfaces, not electro-osmosis.
  • Surface charge density and morphology significantly influence colloid mobility on modified superhydrophobic surfaces.
  • Superhydrophobic surfaces, in their current configurations, do not significantly enhance electro-osmotic mobility.