Polytetrafluoroethylene thin film with polydopamine adhesive layer
AssigneeSurftec, LLC
InventorsSamuel George Beckford, Min Zou, Justin K Carter
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Abstract
One aspect of the present invention relates to a method of fabricating a low friction, wear resistant, polydopamine/polytetrafluoroethylene layered film. In one embodiment, the method comprises the deposition of a polydopamine film on a stainless steel substrate through an oxidative polymerization process, the deposition of a polytetrafluoroethylene nanoparticle film on top of the polydopamine film, and heat treating the layered film to remove moisture and fuse the particles together.
Claims18
A method for forming a durable polytetrafluoroethylene coating on a substrate, comprising
- (a) contacting the substrate with a dopamine solution undergoing an oxidative polymerization reaction to form a 5 nm to 500 nm thick polydopamine coating on the substrate surface;
- (b) depositing an aqueous dispersion of polytetrafluoroethylene on the formed polydopamine coating on the substrate to form the polytetrafluoroethylene coating thereon;
- and
- (c) heating the coated substrate after step (b),
- thereby forming a stack structure comprising the polytetrafluoroethylene coating formed on the polydopamine coating that is, in turn, formed on the substrate.
A method for forming a durable polytetrafluoroethylene and graphene oxide composite coating on a substrate, comprising
- (a) contacting the substrate with a dopamine solution undergoing an oxidative polymerization reaction to form a 5 nm to 500 nm thick polydopamine coating on the substrate surface;
- (b) providing a composite aqueous dispersion comprising polytetrafluoroethylene and graphene oxide;
- (c) depositing the composite dispersion on the formed polydopamine coating on the substrate to form a polytetrafluoroethylene and graphene oxide composite coating thereon;
- and
- (d) heating the coated substrate after step (c),
- thereby forming a stack structure having the polytetrafluoroethylene and graphene oxide composite coating formed on the polydopamine coating that is, in turn, formed on the substrate.
Dependencies are inferred from the claim text.