Coated Diamond Coatings

In another Idea I mentioned a specific use for diamond coatings (link). I mentioned that diamond is a non-stick material, but in an annotation [Ling] mentioned that diamond can attract grease. Obviously this must be fixed!

One of the things that has bothered me, in my imaginations about all the intermolecular bonds of something like diamond, is, "What about the potential for bonds at the surface of the substance?" In many substances those surface atoms simply latch onto whatever atoms or molecules happen by (metals acquire a thin oxide coating), but what do the carbons do, at the surface of a diamond? I'm pretty sure that they are willing to form double-bonds with adjacent carbons (since carbon does double-bonds so easily). But I'm not positive. PERHAPS some of them just "dangle", but in Chemistry, dangling bonds don't usually stay unattached very long.

The fact that diamond attracts grease would fit with a scenario in which diamond has available molecular bonds at its surface. To remove the attraction, the bonds must be tied down permanently.

Well, the most permanent chemical bond a carbon atom can form is with a fluorine atom. That famous substance Teflon is a chain of carbon atoms surrounded by fluorines. And we all know how resistant Teflon is, to stuff sticking to it.

So, whenever we coat something with diamond, to give it surface hardness and other nice properties -- but especially when we want to use the inertness of diamond -- let us also apply just a whiff of fluorine gas. The Idea is that the fluorines will break up those double-bonds at the surface of the diamond, and form a layer. This layer will greatly enhance the chemical inertness of the diamond, because the fluorines bind tightly, and are physically big enough to not let any other atoms get at the carbons.