High contact angle hysteresis of superhydrophobic surfaces: Hydrophobic defects

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Title:	High contact angle hysteresis of superhydrophobic surfaces: Hydrophobic defects
Authors:	Chang,FM;Hong,SJ;Sheng,YJ;Tsao,HK
Contributors:	化學工程與材料工程學系
Keywords:	N/A
Date:	2009
Issue Date:	2010-06-29 17:27:07 (UTC+8)
Publisher:	中央大學
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 degrees 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.
Relation:	APPLIED PHYSICS LETTERS
Appears in Collections:	[National Central University Department of Chemical & Materials Engineering] journal & Dissertation

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