Publication: Determination of microdroplet contact angles using electrically driven droplet oscillations
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Karadağ, Yasin
Jonáš, Alexandr
Tasaltın, Nevin
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Language
English
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Abstract
Oscillatory deformations of micrometer-sized NaCl-water droplets by an AC electric field are used for contact angle measurements on superhydrophobic surfaces. Contact angles are determined from the dependence of the lowest-order resonant frequency of the electrically driven droplet oscillations on the droplet size. The resonant frequency and size of a droplet are found using whispering gallery mode spectroscopy. Measurements are compared with those performed with direct mechanical driving of the droplets using a piezoelectric transducer, and a good agreement is found. The demonstrated contact angle measurement method can be readily integrated into the planar architecture of microfluidic chips.
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Source:
Applied Physics Letters
Publisher:
American Institute of Physics (AIP) Publishing
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Subject
Physics