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Electrowetting on Immersed Conducting Hydrogel.

Caroline Duc1, Alexis Vlandas1, George G Malliaras2

  • 1BioMEMS, Univ. Lille, CNRS, ISEN, UMR 8520 - IEMN , F-59000 Lille, France.

The Journal of Physical Chemistry. B
|September 21, 2017
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Summary

Conducting polymers like poly(3,4-ethylenedioxythiophene) polystyrenesulfonate (PEDOT:PSS) can alter their wettability using ultralow voltage. This study reveals electrowetting drives PEDOT:PSS wettability changes, unlike other polymers, and offers a model for tuning this effect.

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Area of Science:

  • Materials Science
  • Polymer Science
  • Surface Science

Background:

  • Conducting polymers exhibit voltage-controlled wettability changes.
  • Poly(3,4-ethylenedioxythiophene) polystyrenesulfonate (PEDOT:PSS) is a conducting hydrogel with biological interface applications.
  • The electrical control of PEDOT:PSS wettability remains largely unexplored.

Purpose of the Study:

  • To investigate the electrical control of PEDOT:PSS wettability under submerged conditions.
  • To elucidate the mechanism behind wettability variations in PEDOT:PSS.
  • To develop a model for predicting and tuning PEDOT:PSS wettability.

Main Methods:

  • Captive bubble technique for studying wettability.
  • Application of ultralow voltages (<1 V).
  • Surface modification of PEDOT:PSS.

Main Results:

  • PEDOT:PSS wettability changes are driven by electrowetting, not redox reactions.
  • A modified electrowetting model accurately describes PEDOT:PSS behavior in aqueous solutions.
  • Surface coatings allow tuning of contact angles across a wide range.

Conclusions:

  • Ultralow voltage electrowetting is a viable mechanism for controlling PEDOT:PSS surface properties.
  • The proposed model provides a framework for understanding and engineering PEDOT:PSS wettability.
  • PEDOT:PSS offers tunable wettability for potential applications in biointerfaces and beyond.