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The Binary Phase Diagram Naphthalene-C60

Published online by Cambridge University Press:  15 February 2011

Rafael Hidalgo-Quesada ,
Xin-Yu Zhang  and
Bill C. Giessen
Rafael Hidalgo-Quesada
Affiliation:
Chemistry Department and Barnett Institute of Chemical Analysis and Materials Science, Northeastern University, 360 Huntington Avenue, Boston, MA 02115, USA
Xin-Yu Zhang
Affiliation:
Chemistry Department and Barnett Institute of Chemical Analysis and Materials Science, Northeastern University, 360 Huntington Avenue, Boston, MA 02115, USA
Bill C. Giessen
Affiliation:
Chemistry Department and Barnett Institute of Chemical Analysis and Materials Science, Northeastern University, 360 Huntington Avenue, Boston, MA 02115, USA
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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 C60 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 lowertemperature solubility increase (with increasing temperature) is masked by the eutectic. A binary phase diagram based on these data is proposed.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 359: Symposium G – Science and Technology of Fullerene Materials , 1994 , 561
Copyright
Copyright © Materials Research Society 1995

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References

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