Super non-wetting, anti-fingerprinting coatings for glass
OwnerAlain Robert Emile Carre, Valerie Claudine Lacarriereinventors
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Abstract
Articles with surfaces that are both super-hydrophobic and super-oleophobic, and methods for making such articles are described. The article surfaces having contact angles of sessile drops of water and oil greater than 150° and low wetting angle hysteresis leading to low sliding angle of liquid water or oil drops. In some embodiments the water and oil contact angles are greater than 170°.
Claims11
A glass article having a super-hydrophobic and super-oleophobic surface, said glass article comprising a glass substrate having a surface with a micro-roughness of ≧300 nm (rms), silica nanostructure particles deposited on the roughened glass surface and a selected perfluoroalkyl-Si coating on the micro-rough surface and nanostructure particles deposited thereon;
- the perfluoroalkyl-Si coating being bonded to the roughened glass and the silica nanostructure particles by 2-3 Si—O—Si bonds for each perfluoroalkyl-Si coating molecule.
A method of making a glass article having a super-hydrophobic and sup-oleophobic surface, the method comprising the steps of:
- providing a glass substrate;
- roughening the surface of the substrate to have a micro-roughness>300 nm (rms) by grinding the surface using a selected grinding material;
- forming nanostructure particles on the surface of the micro-roughened glass suing an alkyltrichlorosilane;
- pyrolyzing the alkyltrichlorosilane nanostructure to form a silica nanostructure;
- and
- coating the micro-rough and silica nanostructure with a perfluoroalkyl coating material selected from the group consisting of perfluoroalkyl(alkyl)dichlorosilanes [RFR1Cl2Si], perfluoroalkyl(alkyl)dialkoxylsilanes [RFR1R2Si], and perfluoroalkyltrialkoxysilanes [RF(R2)3Si) where RF is a selected perfluoroalkyl, R1 is selected from the group consisting of methyl and ethyl, and R2 is selected from the group consisting of methoxy and ethoxy.
Dependencies are inferred from the claim text.