Finite conductivity effects and apparent contact angle saturation in AC electrowetting

Abishek Kumar, Manuela Pluntke, Benjamin Cross, Jean-Christophe Baret, Frieder Mugele

Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademic

11 Citations (Scopus)


We measured the electrowetting behavior of aqueous salt solutions. By varying the conductivity and the frequency of the applied AC voltage we determined the range of the validity perfect conductor assumption of the standard electrowetting theory for the case of AC voltage. We show that the contact angle reduction is dramatically reduced at high frequency and low salt concentration due to Ohmic losses with the liquid. A simple RC-equivalent circuit model explains the observations. It is demonstrated that finite conductivity effects are more pronounced for sessile droplets than for droplets confined between to parallel plates.
Original languageEnglish
Title of host publicationDynamics in small confining systems
Subtitle of host publicationNovember 28-December 2, 3005, Boston, Massachusetts, USA
PublisherMaterials Research Society
Number of pages8
ISBN (Print)9781558998544
Publication statusPublished - 2006

Publication series

NameMaterials Research Society symposium proceedings
PublisherMaterials Research Society


  • METIS-234899


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