Two liquids wetting and low hysteresis electrowetting on dielectric applications.
This study focuses on electrowetting using two immmiscible liquids on a dielectric coating. It is demonstrated that low contact angle of oil on the hydrophobic surfaces is a key parameter to obtain a low hysteresis system, below 2 degrees . On the basis of these results, three aspects of the wetting properties have been studied: the influence of the surface hydrophobic properties, the design of the liquids according to the hydrophobic surface, and a graphical method to solve the Bartell-Osterhof equation and predict the wetting properties of two liquids on a surface. These results define clear design rules to obtain a low hysteresis system, useful for many applications from liquid lenses to displays and laboratory-on-a-chip.
Maillard
Mathieu
M
Varioptic, 24b rue Jean Baldassini, 69007 Lyon, France. mathieu.maillard@varioptic.com
Legrand
Julien
J
Berge
Bruno
B