Coating Gradient Effect on Contact Angle in Electrowetting
[1]
Abdulwahab S. Aljuhani, Chemical Engineering Department, Yanbu Industrial College, Yanbu, Saudi Arabia.
[2]
Dinesh Lolla, Bioscience and Water Filtration Division, Parker-Hannifin Corporation, Oxnard, USA.
[3]
Ahmed Abutaleb, Department of Chemical Engineering, Jazan University, Jazan, Saudi Arabia.
[4]
George G. Chase, Department of Chemical and Biomolecular Engineering, the University of Akron, Akron, USA.
The ability to control the movement of microliter water droplets in different types of electrowetting setups has been reported in literature. In this work, we report a method for controlling micro droplet movement along gradient coating. Poly (styrene-co-methyl methacrylate) film was created on Indium Tin Oxide (ITO) coated glass slides. The films had a gradient. Apparent Contact angle change in electrowetting setup was monitored and characterized with 4 different voltages: 300 VDC, 400 VDC, 500 VDC and 550 VDC. The water microdroplet was observed to move distances as much as 1.6 cm at an average speed of 34 ± 1 mm/s along the surface of the coated ITO glass slides at about 520 VDC.
Surface Coating, Microfluidics, Dielectric Materials, Electrowetting, Filtration
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