Superhydrophobic floatability of a hydrophilic object driven by edge effect

Feng Ming Chang, Yu Jane Sheng, Heng Kwong Tsao

Research output: Contribution to journalArticlepeer-review

17 Scopus citations


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.

Original languageEnglish
Article number204107
JournalApplied Physics Letters
Issue number20
StatePublished - 2009


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