Water induced hydrophobic surface

A polyurethane coating is described that has hydrophilic wetting behavior when dry and hydrophobic when wet. A difference of approximately 25 degrees in advancing contact angles for dry (83 degrees ) and wet (108 degrees ) states is found by sessile drop and dynamic methods. The term "contraphi...

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Bibliographische Detailangaben
Veröffentlicht in:Langmuir : the ACS journal of surfaces and colloids. - 1985. - 21(2005), 9 vom: 26. Apr., Seite 3742-5
1. Verfasser: Makal, Umit (VerfasserIn)
Weitere Verfasser: Wynne, Kenneth J
Format: Aufsatz
Sprache:English
Veröffentlicht: 2005
Zugriff auf das übergeordnete Werk:Langmuir : the ACS journal of surfaces and colloids
Schlagworte:Letter Research Support, Non-U.S. Gov't Research Support, U.S. Gov't, Non-P.H.S. Hydantoins Hydrocarbons, Fluorinated Polyurethanes Water 059QF0KO0R
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245 1 0 |a Water induced hydrophobic surface 
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500 |a Date Completed 28.07.2006 
500 |a Date Revised 21.11.2013 
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500 |a Citation Status MEDLINE 
520 |a A polyurethane coating is described that has hydrophilic wetting behavior when dry and hydrophobic when wet. A difference of approximately 25 degrees in advancing contact angles for dry (83 degrees ) and wet (108 degrees ) states is found by sessile drop and dynamic methods. The term "contraphilic" is suggested for this reversible change opposite customary amphiphilic behavior. Contraphilic behavior results from a soft block containing semifluorinated and 5,5-dimethyhydantoin segmers. Amide inter/intramolecular hydrogen bonding is proposed for the hydrophilic (dry) state, while surface-confined, amide-water hydrogen bonding "releases"semifluorinated groups, giving the hydrophobic state. Water-induced hydrophobic surfaces may lead to applications for easily switched wetting, such as in microfluidics 
650 4 |a Letter 
650 4 |a Research Support, Non-U.S. Gov't 
650 4 |a Research Support, U.S. Gov't, Non-P.H.S. 
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650 7 |a Hydrocarbons, Fluorinated  |2 NLM 
650 7 |a Polyurethanes  |2 NLM 
650 7 |a Water  |2 NLM 
650 7 |a 059QF0KO0R  |2 NLM 
700 1 |a Wynne, Kenneth J  |e verfasserin  |4 aut 
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