title: Two liquids wetting and low hysteresis electrowetting on dielectric applications.
abstract: 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.
authors.affiliation: Varioptic, 24b rue Jean Baldassini, 69007 Lyon, France. mathieu.maillard@varioptic.com
authors.forename: Mathieu
authors.initials: M
authors.lastname: Maillard
authors.forename: Julien
authors.initials: J
authors.lastname: Legrand
authors.forename: Bruno
authors.initials: B
authors.lastname: Berge