Electrically Tunable Wetting Defects Characterized by a Simple Capillary Force Sensor

Dieter 't Mannetje, A.G. Banpurkar, Helmer Koppelman, Michael H.G. Duits, Henricus T.M. van den Ende, Friedrich Gunther Mugele

Research output: Contribution to journalArticleAcademicpeer-review

25 Citations (Scopus)

Abstract

We present a concept of a wetting defect of continuously variable strength based on electrowetting, along with a capillary force sensor adapted for the characterization of macroscopically heterogeneous surfaces. Patterned electrodes submerged under an insulating layer are used to generate potential wells for drops of electrically conductive liquids on the solid surface, with a well depth that scales with the diameter of the drop and square of the applied alternating (AC) voltage. We characterize the strength of the electrowetting trap and the hysteretic motion of the drop along the surface, using a simple force sensor based on optical imaging of a thin bendable capillary. A force resolution of approximately 0.1 μN is achieved
Original languageEnglish
Pages (from-to)9944-9949
JournalLangmuir
Volume29
Issue number31
DOIs
Publication statusPublished - 2013

Keywords

  • METIS-300706
  • IR-89636

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