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Electrowetting of ionic liquids.

Stefano Millefiorini1, Alan H Tkaczyk, Rossen Sedev

  • 1Ian Wark Research Institute, University of South Australia, Mawson Lakes, SA 5095, Australia.

Journal of the American Chemical Society
|March 2, 2006
PubMed
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Commercial ionic liquids can electrowet Teflon surfaces, but with lower efficiency and unique voltage-dependent behaviors compared to aqueous solutions. These findings highlight the influence of ionic liquid properties on electrowetting performance.

Area of Science:

  • Surface Science
  • Electrochemistry
  • Materials Science

Background:

  • Electrowetting is a technique to manipulate surface wettability using electric fields.
  • Room-temperature ionic liquids (RTILs) offer unique properties as electrolytes.
  • Fluoropolymers like Teflon AF1600 are widely used due to their chemical inertness and low surface energy.

Purpose of the Study:

  • To investigate the electrowetting of Teflon AF1600 surfaces using imidazolium- and pyrrolidinium-based room-temperature ionic liquids.
  • To compare the electrowetting behavior of ionic liquids with that of aqueous electrolyte solutions.
  • To identify and analyze peculiar phenomena observed during ionic liquid electrowetting.

Main Methods:

  • Electrowetting experiments were conducted using direct current (dc) voltage on Teflon AF1600 surfaces.

Related Experiment Videos

  • Contact angle measurements were performed as a function of applied voltage.
  • Commercial room-temperature ionic liquids (imidazolium- and pyrrolidinium-based) were used as electrolytes.

    • Main Results:

    • Successful electrowetting of Teflon AF1600 with RTILs was demonstrated, showing a parabolic contact angle vs. voltage relationship that saturates.
    • Electrowetting efficiency was significantly lower (by an order of magnitude) compared to aqueous solutions.
    • A notable asymmetry in saturation contact angles for positive and negative voltages was observed, potentially linked to cation-anion asymmetry.
    • The influence of the bulky cation was more pronounced than the anion on electrowetting saturation.

    Conclusions:

    • Room-temperature ionic liquids can effectively electrowet fluoropolymer surfaces, albeit with reduced efficiency.
    • The electrowetting behavior of RTILs is influenced by their inherent properties, such as cation size and asymmetry.
    • Impurities like water in commercial RTILs may contribute to the observed low efficiency and peculiar behaviors.