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Institute for Measurement Technology
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Experimental set-up for analysis of electrowetting

Simon Paireder


Electrowetting changes liquid's surface tensions by applying an electric field. This changes both the wetting surface and the angle of contact between the liquid and the underlying surface. Furthermore, droplets can be moved on a hydrophobic surface by using and controlling skilfully disposed electrodes in an appropriate manner. Electrowetting is an innovative technology. Its theoretical basics were already supplied 1875 by Gabriel Lippmann. However, serious research has not been started before the nineties of last century. Nowadays, this technology is getting more and more used in diverse kinds of applications.

Figure 1: Electrodes for moving a water droplet

This includes exact positioning of smallest electronic devices on a circuit board. This effect is moreover used for optical lenses within adjustable focal length or for optical switches which are used for displays.
Another field are lab-on-a-chip applications, where chemical or biological analysis, are performed on small scaled customized chips.

This bachelor thesis aims to build up an experimental set-up which allows to analyze and investigate the above-mentioned effects.