TITLE

Superhydrophobic floatability of a hydrophilic object driven by edge effect

AUTHOR(S)
Chang, Feng-Ming; Sheng, Yu-Jane; Tsao, Heng-Kwong
PUB. DATE
November 2009
SOURCE
Applied Physics Letters;11/16/2009, Vol. 95 Issue 20, p204107
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
It is generally believed that a water-repellent surface is necessary for small insects to stand on water. Through a combined experimental and theoretical study, we demonstrate that an object with hydrophilic surface can float with apparent contact angle greater than 90° due to edge effect. The apparent contact angle rises with increasing loading even to a value typically displayed only by superhydrophobic surfaces. On the basis of free energy minimization, two regimes are identified. When buoyancy controls, the meniscus meets the object with the intrinsic contact angle. As surface tension dominates, however, contact angle is regulated by total force balance.
ACCESSION #
45366459

 

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