Release Time:2019-03-09  Hits:

Indexed by: Journal Article

Date of Publication: 2011-10-01

Journal: CHINESE SCIENCE BULLETIN

Included Journals: SCIE、Scopus

Volume: 56

Issue: 28-29

Page Number: 3082-3086

ISSN: 1001-6538

Key Words: oscillation; sessile droplet; ac electric field; hydrophobic surface

Abstract: We report a novel oscillatory behavior of a sessile droplet on a hydrophobic surface. The droplet was placed on an electrode with a hydrophobic surface and close to, but not touching, a second needle-like electrode. The change in the contact angle was observed only when the droplet oscillated. In a traditional electro-wetting experiment, however, the contact angle decreased immediately when an alternating current electric field was applied. In addition, the non-contact mode gave rise to a true sessile condition of the droplet, whose oscillation amplitude was not linearly proportional to the driving voltage but reached a maximum value.