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Preparation of Light-responsive Membranes by a Combined Surface Grafting and Postmodification Process
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Complementary electrowetting devices on plasma-treated fluoropolymer surfaces.

D Y Kim1, A J Steckl

  • 1Nanoelectronics Laboratory, University of Cincinnati, Cincinnati, Ohio 45221-0030, USA.

Langmuir : the ACS Journal of Surfaces and Colloids
|March 25, 2010
PubMed
Summary
This summary is machine-generated.

Plasma treatment and annealing reversed electrowetting behavior in two-fluid devices. This novel pEW (plasma-electrowetting) method enables complementary operation and potentially low-power fluid manipulation.

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Area of Science:

  • Surface science
  • Materials science
  • Fluid dynamics

Background:

  • Electrowetting (EW) on dielectric typically involves two immiscible fluids, like water and oil.
  • Standard EW (nEW) relies on hydrophobic surfaces to control fluid behavior.
  • Controlling two-fluid interfaces is crucial for microfluidic applications.

Purpose of the Study:

  • To investigate a modified electrowetting process using plasma irradiation and annealing.
  • To achieve a reversal of the normal two-fluid electrowetting behavior.
  • To explore low-power operation for two-fluid EW devices.

Main Methods:

  • Plasma irradiation of a fluoropolymer surface to alter its properties.
  • Thermal annealing to restore hydrophobic characteristics post-irradiation.
  • Fabrication and testing of plasma-irradiated and annealed EW (pEW) devices.
  • Measurement of water droplet contact and rolling angles.
  • Observation of oil layer displacement and return under varying voltage conditions.

Main Results:

  • Plasma irradiation followed by annealing created a surface with reversed electrowetting properties.
  • The pEW device exhibited displacement of the oil layer at zero voltage and its return at high voltage.
  • nEW and pEW devices demonstrated complementary electrowetting operations.
  • Oil movement and optical transmission confirmed the reversed EW action.

Conclusions:

  • A novel method for reversing two-fluid electrowetting has been developed.
  • Plasma-induced surface modification is key to the observed reversed EW effect.
  • This technique offers potential for low-power, complementary operation in two-fluid microfluidic systems.