Isotopically pure diamond

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Isotopically pure diamond

I only recall having seen somewhere that isotopically pure (meaning all the atoms are of the same isotopic number, such as 12 or 13 for the carbon in diamond) diamond gives an even higher thermal conductivity than the already high for normal diamond that contains a mixture of both isotopes. It is my understanding that this pure form is manufactured for the purpose of making heat sinks for the semi conductor industry.

If 238/235 Uranium can be separated in gaseous form, uranium hexafluoride, UH6, 12/13 carbon ought to be possible to centrifuge the gas CO2, before making synthetic diamonds of the carbon in it.