Transparent self-healing oleophobic and hydrophobic coatings
The present disclosure relates, in exemplary embodiments, to processes for preparing omniphobic coatings on a substrate. The disclosure further relates to substrates comprising an omniphobic coating comprising a fluoride ion encapsulated F-POSS.
1. An omniphobic glazed substrate comprising a substrate; and an omniphobic coating comprising an omniphobic layer of a fluoroalkylsilane (FAS) or an alkylsilane (AS) and a fluoride ion encapsulated fluoro polyhedral oligomeric silsesquioxane (F − -F-FOSS), and
wherein the substrate is a glass material, a ceramic or a glass-ceramic.
2. The omniphobic glazed substrate of claim 1 , wherein the omniphobic coating further comprises an aqueous base or an aqueous acid.
3. The omniphobic glazed substrate of claim 1 , wherein a surface of the substrate has an RMS surface roughness of greater than 5 nm, and has been activated by treatment with a plasma of a gas selected from the group consisting of Ar, He, N 2 and O 2 , or by a plasma of a mixture of at least two of these gases.
4. The omniphobic glazed substrate of claim 1 , wherein a surface of the substrate has an RMS surface roughness of greater than 5 nm, and has been activated by treatment with a plasma of a gas mixture of H 2 O vapor and a gas selected from the group consisting of Ar, He and N 2 .
5. The omniphobic glazed substrate of claim 1 , wherein the omniphobic layer has a thickness of between about 10 and about 500 nm.
6. The omniphobic glazed substrate of claim 1 , wherein the omniphobic layer has a thickness of between about 20 and about 100 nm.
7. The omniphobic glazed substrate of claim 1 , wherein the omniphobic layer has a thickness of about 10 nm.
8. The ominphobic glazed substrate of claim 1 , wherein the fluoride ion encapsulated fluoro polyhedral oligomeric silsesquioxane (F − -F-POSS) has the following formula:
wherein Rf is F 3 C—(CF 2 ) m —(CH 2 ) n —, wherein m is an integer from 0 to 15 and n is an integer from 0 to 5; the fluoroalkylsilane (FAS) has the formula F 3 C—(CF 2 ) m —(CH 2 ) n —Si(X) 3-p (R) p wherein m is an integer from 0 to 15; n is an integer from 0 to 5; p is 0, 1 or 2; R is an alkyl group or a hydrogen atom; and X is a hydrolysable group; and the alkylsilane (AS) has the formula H 3 C—(CH 2 ) m —Si(X) 3-p (R) p wherein m is an integer from 0 to 15; p is 0, 1 or 2; R is an alkyl group or a hydrogen atom; and X is a hydrolysable group.
9. An omniphobic glazed substrate comprising a substrate; and an omniphobic coating comprising an omniphobic layer of a fluoroalkylsilanes (FAS) or an alkylsilane (AS) and a fluoride ion encapsulated fluoro polyhedral oligomeric silsesquioxane (F − -F-FOSS), and
wherein the omniphobic coating is deposited onto an activated substrate so that the omniphobic layer is bonded to the substrate.