The epoxides break up by mechanical agitation.[/size]
The C60 epoxides are stable. Whether they are bad or not is open to question.. But C60 is capable of doing more than reacting with oxygen. In my experience, MCT oil with dissolved C60 decomposes when exposed to red light. It produces a distinct odor of rancidity, which is the smell of free caprylic acid. C60 also appears to react with other things dissolved with it when exposed to red light (and likely any light).
Epoxides take a very long time to form.
From your citation
"A ratio of peak intensities indicates approximately 0.7% epoxide formation, after 21 h of light exposure (Fig. S1)."
(my note here) ***That's a small fraction after a long time of light exposure.***
"By MS, no additional peaks corresponding to a mass lower than one individual fullerene molecule were present in a solution exposed to light indicating that photolysis is not taking place. Due to the relatively slow formation of C60Ox, a significantly longer exposure time
of 2 weeks was employed for FTIR spectroscopy samples in order to increase the concentration of oxidised fullerene.
Upon light exposure, peaks were observed at 806, 1018, 1095, 1261 and 1459 cm−1 which have been previously assigned to fullerene epoxide formation [27–29], either for C60O or C60O3 as indicated on Fig. 1b (C60O2 was not observed by FTIR spectroscopy, but was shown to be present by MS)."
In order to get measureable useable data they had to expose the oil to light for 2 weeks.
Like I said -- a nothing burger.
Edited by sensei, 08 December 2017 - 07:17 PM.