Journal
JOURNAL OF COLLOID AND INTERFACE SCIENCE
Volume 303, Issue 2, Pages 517-524Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2006.08.004
Keywords
electrowetting; electrocapillary; saturation; surface energy; contact angle; sodium dodecyl sulfate; dodecane; amorphous fluoroploymer; dielectric; microfluidics
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This paper investigates the nonideal electrowetting behavior of thin fluoroploymer films. Results are presented for a three phase system consisting of: (1) an aqueous water droplet containing sodium dodecyl sulfate (SDS), (2) phosphorous-doped silicon topped with SiO2 and an amorphous fluoroploymer (aFP) insulating top layer on which the droplet is situated, and (3) a dodecane oil that surrounds the droplet. The presented measurements indicate that the electrowetting equation is valid down to a 6 nm thick aFP film on a 11 nm thick SiO2. At this dielectric thickness, a remarkable contact angle change of over 100 degrees can be achieved with an applied voltage less than 3 V across the system. The data also shows that for this water/surfactant/oil system, contact angle saturation is independent of the electric field, and is reached when the surface energy of the solid-water interface approaches zero. (c) 2006 Elsevier Inc. All rights reserved.
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