Changing surface hydro- and oleophobicity with resorcinarene multilayers-a simple water/oil proofing process.
Resorcinarenes (resorcinol-aldehyde tetramers) of appropriate structures have been shown to change the hydro- and oleophilicities of a variety of surfaces. The phenomenon results from attachment of the rim of the bowl-like molecules to hydrophilic surfaces. Hydrophobic (alkyl) and oleophobic (perfluoro alkyl) "legs" attached to the bowls then determine the immediate surface property. Amounts required to modify surfaces are only between 2 and 10 mg m(-2) treated, and there is evidence of multilayer formation. Penetration of surfaces by a variety of liquids has been studied and cannot easily be understood as a function of density, viscosity, or surface tension.
Institute of Bioscience and Technology, Cranfield University at Silsoe, Silsoe, MK45 4DT United Kingdom. f.davis@cranfield.ac.uk
Frank
F
Davis
Elaine
E
Frary
Charles J M
CJ
Stirling
D000042:Absorption; D047250:Calixarenes; D018360:Crystallography, X-Ray; D000431:Ethanol / Q000737:chemistry; D006046:Gold / Q000737:chemistry; D006586:Hexanes / Q000737:chemistry; D057927:Hydrophobic and Hydrophilic Interactions; D008958:Models, Molecular; D015394:Molecular Structure; D009821:Oils / Q000737:chemistry*; D010316:Particle Size; D010649:Phenylalanine / Q000031:analogs & derivatives* / Q000737:chemistry; D013499:Surface Properties; D014867:Water / Q000737:chemistry
D006586:Hexanes; D009821:Oils; C466160:resorcinarene; D014867:Water; D047250:Calixarenes; D000431:Ethanol; D010649:Phenylalanine; D006046:Gold