Brian from Seattle asks: "I have read on a number of websites that some of the guys making C60 oil put their C60 in an oven to increase the strength.
Does this work?
What is going on?"
C60 is manufactured to varying degrees of purity. The purification process for most forms of C60 involves solvents. We suspect that some people believe that the lower purity of some forms of C60 is due to solvents. This is not the case. If you refer to the SES Research website they point out the impurities are other carbon fullerenes. "Purity is expressed of fullerene content compared to other carbon fullerenes content." In basic English this is saying that the 0.05% of a 99.95% pure sample of C60 is other fullerenes.
In the case of C60, these 'other fullerenes' are mainly C70. It isn't solvents like toluene. Incidentally, C70 has its own properties, for example, it has been shown to dampen allergic reactions. Perhaps not such a bad thing.
Putting C60 in an oven will not remove these impurities if it were that easy we believe the manufacturers would do that instead of expending a lot of money on processing. So possibly some C60 in oil products are being advertised as using higher purity C60 than they really are.
The higher grades of C60 are heated in a vacuum oven with the intention of driving off any residual traces of solvent, the main one being toluene. In reality the amount of solvent in all of the higher grades of C60 is so minimal there is more toluene in tap water. A discussion would be useful but that is for another time.
The real question is whether these fractions of a percent of other fullerenes make any difference. From the reports we have seen of people using C60, we have not found any that claim any problems with C60 of 99.95% pure and above. This is what we use.
Hopefully, that clears up that question for you.