3 ms·
Diamond synthesis machines are at ~100 MPa. I wonder if these food ones are capable of making gems without high temperatures.
by bufferoverflow 7y ago
Diamond synthesis machines are at ~100 MPa. I wonder if these food ones are capable of making gems without high temperatures.
- mogadsheu 7y agoUnfortunately the pressure in HPP machines is dispersed over a large vessel (foot scale diameter cylinders), while diamond anvil cells and the like focus that pressure at the mm/sub-mm scale. Would be nice though!
- bufferoverflow 7y agoWhy would that matter? High pressure is high pressure. Large vessel would mean you can grow many diamonds at the same time, no?
- mogadsheu 7y agoYou might be right... pressure needed for diamond synthesis is almost certainly much higher than for killing bacteria via pressure drop. Turns out, it is, and they add temperature to the mix: >They were able to heat carbon to about 3,000 °C (5,430 °F) under a pressure of 3.5 gigapascals (510,000 psi) for a few seconds.
- lostmyoldone 7y agoThe high pressure high temperature synthesis (HPHT) use pressures from 5GPa and up, but as the slides talk about 600MPa as a useful pressure the difference is "only" a factor 10. One additional issue with diamond synthesis with the HPHT is that you need 1400°C, and the correct mix of graphite and metallic catalysts.