ooc// it is not a lecture only info....... I got this a few years back and lost the URLs but here it is
the cut is so clean that intermolecular forces make is grip so strongly, when you put two pieces of glass to together they tend to stick it is that same kind of force.(in the case of this

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It is that is a single molecule wide, like an ultrathin razor so it would be able to pass through the space between all molecules and break the bonds between them. Yet the fact that the black is so thin the thickness of the sword black itself would it in the way, and it's not particularly suited to cutting through thick object, It would need a very this bald, it would be possible if you could fins materials to the lower the coefficient of friction of the blades lateral.