4 ms·
*nanotwinned diamond composite, which is presumably not naturally occurring. Interested to know what kind of sizes its typically available in.
by jessriedel 3y ago
*nanotwinned diamond composite, which is presumably not naturally occurring.
Interested to know what kind of sizes its typically available in.
- A_D_E_P_T 3y agoIt's not made in commercial quantities anywhere, so there is no typical availability. In the paper, they were looking at scales of 1nm, using a high-resolution electron microscope. The test sample was made via high-pressure/high-temperature compression of "onion carbon" -- itself a very unusual material. It's an interesting paper, but I don't know if the material's manufacturing method scales -- and, in any case, the self-healing effect is on the smallest possible scale, so it stands to reason that bulk samples, visible to the naked eye, will not exhibit it to any appreciable degree.
- jessriedel 3y ago> it stands to reason that bulk samples, visible to the naked eye, will not exhibit it to any appreciable degree. I don't follow. It only takes a single crack to split a sample into two macroscopic pieces. If a small crack begins forming, and likely to either heal or get worse, that seems to have obvious macroscopic effects.