Phase Equilibria in the Fullerene C60-Fullerene C70-Hexane-o-Xylene-Dimethylformamide System |
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| Authors: | V A Keskinov A K Pyartman N A Charykov O V Arapov A A Pronkin V V Lishchuk V V Leonov |
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| Institution: | (1) Technological Institute, St. Petersburg, Russia;(2) ZAO Innovatsii Leningradskikh Institutov i Predpriyatii, St. Petersburg, Russia |
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| Abstract: | The phase diagram of the hexane-o-xylene-dimethylformamide ternary liquid system was studied at T= 298.15 K. The diagram contained the regions of homogeneous solutions and two-phase liquid systems (systems with stratification), phase I being enriched in dimethylformamide and phase II, in hexane. The distribution of fullerenes C60 and C70 was considered at various concentrations and simultaneous presence in sections at variable phase compositions. The extraction isotherms of fullerenes C60 and C70 under various conditions were found to be close to linear, and the C70/C60 separation factor depended on the composition of the coexisting phases and ranged from 1.25 to 1.8. Fullerene C70 was predominantly distributed in phase I. |
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