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Electrowetting on a polymer microlens array.

Maesoon Im1, Dong-Haan Kim, Joo-Hyung Lee

  • 1Department of Electrical Engineering, KAIST, 335 Gwahangno, Yuseong-gu, Daejeon 305-701, Republic of Korea.

Langmuir : the ACS Journal of Surfaces and Colloids
|May 15, 2010
PubMed
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This study explores electrowetting on a flexible poly(dimethylsiloxane) (PDMS) microlens array. Researchers observed reversible water droplet contact angle changes, with reversibility lost upon complete wetting.

Area of Science:

  • Materials Science
  • Surface Science
  • Microfluidics

Background:

  • Flexible poly(dimethylsiloxane) (PDMS) is a versatile material for micro-optics and microfluidics.
  • Electrowetting allows for tunable surface wettability and droplet manipulation via applied voltage.
  • Microlens arrays offer unique surface topographies that can influence fluid behavior.

Purpose of the Study:

  • To investigate the electrowetting behavior of a flexible PDMS microlens array.
  • To determine the range of contact angle modulation achievable.
  • To analyze the reversibility of the electrowetting phenomenon and factors affecting it.

Main Methods:

  • Fabrication of a PDMS microlens array with integrated Cr/Au electrodes.
  • Application of parylene and Teflon coatings for insulation and hydrophobicity enhancement.

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  • Observation and measurement of water droplet contact angles under varying voltages (0-200 V).

    • Main Results:

    • A nearly superhydrophobic surface was achieved, with initial contact angles around 140 degrees.
    • Contact angles were tunable from approximately 140 to 58 degrees with applied voltage.
    • Reversibility was observed for voltages below 100 V, but lost upon complete wetting.

    Conclusions:

    • The PDMS microlens array exhibits significant electrowetting-induced contact angle changes.
    • The microlens curvature influences water impalement, affecting electrowetting reversibility.
    • Understanding these phenomena is crucial for applications in tunable optics and microfluidic devices.