High contact angle hysteresis of superhydrophobic surfaces: Hydrophobic defects

Feng Ming Chang, Siang Jie Hong, Yu Jane Sheng, Heng Kwong Tsao

Research output: Contribution to journalArticlepeer-review

80 Scopus citations


A typical superhydrophobic surface is essentially nonadhesive and exhibits very low water contact angle (CA) hysteresis, so-called Lotus effect. However, leaves of some plants such as scallion and garlic with an advancing angle exceeding 150° show very serious CA hysteresis. Although surface roughness and epicuticular wax can explain the very high advancing CA, our analysis indicates that the unusual hydrophobic defect, diallyl disulfide, is the key element responsible for contact line pinning on allium leaves. After smearing diallyl disulfide on an extended polytetrafluoroethylene (PTFE) film, which is originally absent of CA hysteresis, the surface remains superhydrophobic but becomes highly adhesive.

Original languageEnglish
Article number064102
JournalApplied Physics Letters
Issue number6
StatePublished - 2009


Dive into the research topics of 'High contact angle hysteresis of superhydrophobic surfaces: Hydrophobic defects'. Together they form a unique fingerprint.

Cite this