학술논문
High contact angle hysteresis of superhydrophobic surfaces: Hydrophobic defects.
Document Type
Article
Source
Subject
*HYDROPHONE
*PHYSICAL & theoretical chemistry
*SURFACES (Technology)
*SURFACE chemistry
*HYSTERESIS
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Language
ISSN
0003-6951
Abstract
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. [ABSTRACT FROM AUTHOR]