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Diamond like carbon as a hydrophobic material for electrowetting

: Türk, Semih; Viga, Reinhard; Vogt, Holger

Staat, Manfred (Hrsg.) ; Fachhochschule Aachen; Young Researchers Academy - MedTech in NRW -YRA-:
3rd YRA MedTech Symposium "Young Researchers Academy MedTech in NRW" 2019. Symposium Proceedings : May 24, 2019, FH Aachen; FH Aachen / Campus Jülich
Duisburg: Universität Duisburg-Essen, 2019
ISBN: 978-3-940402-22-6
DOI: 10.17185/duepublico/48750
MedTech Symposium <3, 2019, Jülich>
Conference Paper
Fraunhofer IMS ()

In many digital microfluidic applications, electrowetting is used to modify the surface tension of a fluid and to control the contact angle at the solid-gas-liquid triple point. By using electrowetting, the surface tension of a droplet is changed by an electric field between two electrodes surrounded by dielectric material. This leads to a change in the contact angle according to the Lippmann-Young equation [1]. The resulting contact angle ! is proportional to the intrinsic contact angle !" and to the applied voltage V, among other things. Since the effect of electrowetting saturates at an applied voltage of V = 40 - 50V, the applied electrical voltage must be reduced for an even greater range of contact angle modification [1]. Increasing the contact angle by microstructuring of a hydrophobic surface offer an approach [2]. This enables electrowetting application based on CMOS chips, e.g. for lab-on-a-chip applications.