Abstract
Molten naphthalene has considerable solubility for C60 (~5 ⊙ 10−3 in mole fraction) making it a potential solvent for fullerenes; the phase diagram is therefore important. It was also of interest to study whether CM displays the same anomalous solubility behavior in naphthalene as in hexane, CS2, and toluene, where the solubility increases with temperature up to a maximum near room temperature and decreases subsequently.
The naphthalene-C60 eutectic temperature was determined by DSC; the solubility of C60 in the liquid solution up to ~180 °C was derived by UV spectrophotometry and found to decrease monotonically with increasing temperature from a mole fraction of 5 ⊙ 10−3 at the eutectic (~79.5 °C) to 1.5 ⊙ 10−3 at 165 °C; thus, it shows a higher-temperature C60 solubility decrease (with increasing temperature) analogous to the other solutions, while a potential lower-temperature solubility increase (with increasing temperature) is masked by the eutectic. A binary phase diagram based on these data is proposed.
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Hidalgo-Ouesada, R., Zhang, XY. & Giessen, B.C. The Binary Phase Diagram Naphthalene-C6O. MRS Online Proceedings Library 359, 561–566 (1994). https://doi.org/10.1557/PROC-359-561
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DOI: https://doi.org/10.1557/PROC-359-561