Bioinspired synthesis of superhydrophobic coatings.
A superhydrophobic material prepared by precipitating calcium phosphate on TiO2 films under in vitro conditions is described. Crystalline calcium phosphate is very porous with octacalcium phosphate as the main phase. The films are made hydrophobic by the surface grafting of a perfluorophosphate surfactant (Zonyl FSE). The as-prepared coatings were strongly hydrophobic, with advancing contact angles exceeding 165 degrees and receding angles exceeding 150 degrees . The formation of the calcium phosphate layer is self-organizing, and the coating is easily functionalized. The material was characterized with dynamic contact angle measurements, SEM, XRD, and XPS. The strong water repellency is explained by the open porous morphology of the calcium phosphate coating together with the successful attachment of the hydrophobic function.
Järn
Mikael
M
Center for Functional Materials, Department of Physical Chemistry, Abo Akademi University, Porthansgatan 3-5, FI-20500, Turku, Finland.
Heikkilä
Mikko
M
Lindén
Mika
M
D040761:Biomimetic Materials / Q000138:chemical synthesis* / Q000737:chemistry; D032701:Biomimetics; D002130:Calcium Phosphates / Q000737:chemistry; D057927:Hydrophobic and Hydrophilic Interactions; D008855:Microscopy, Electron, Scanning; D014961:X-Ray Diffraction
D002130:Calcium Phosphates; C020243:calcium phosphate