Thermodynamic properties of C60 fullerene solutions in individual and mixed organic solvents
Thermodynamic properties of C60 fullerene solutions in individual and mixed organic solvents
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DOI：
10.1016/j.molliq.2006.08.045
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发表时间：
2007-03-15
影响因子：
6
通讯作者：
Kozlov, A. V.
中科院分区：
文献类型：
--
作者：
Kolker, A. M.;Islamova, N. I.;Kozlov, A. V.
在298.15- 338.15K温度范围内，研究了C-60富勒烯在四氯甲烷-甲苯和四氯甲烷-1，2-二氯苯混合溶剂中的溶解度。提出了C-60溶解度随温度和溶剂组成变化的关系式，并计算了C-60溶液的热力学函数。我们能够识别C-60-四氯甲烷-甲苯和C-60-四氯甲烷-1，2-二氯苯体系中的固体溶剂化物。用差示扫描量热法（DSC）测定了所观察到的固体溶剂化物的不一致熔化温度和不一致熔化曲线。我们还测量了C-60在四氯化碳、甲苯和1，2-二氯苯中的溶解和溶剂化热力学函数。结果表明，C-60溶剂化吉布斯自由能的温度依赖性是由熵项控制的。(C)2006 Elsevier B. V.保留所有权利。
The solubility of C-60 fullerene in tetrachloromethane-toluene and tetrachloromethane-1,2-dichlorobenzene mixtures has been studied in a wide range of solvent compositions within 298.15-338.15 K temperature interval. The equation describing the C-60 solubility depending on the temperature and solvent composition has been suggested and thermodynamic functions of C-60 solution have been calculated. We were able to identify the solid solvates in C-60-tetrachloromethane-toluene and C-60-tetrachloromethane-1,2-dichlorobenzene systems. The temperatures and enthalpies of incongruent melting of the observed solid solvates have been determined using the differential scanning calorimetry (DSC). We also measured the thermodynamic functions of solution and solvation of C-60 in the individual tetrachloromethane, toluene and 1,2-dichlorobenzene. It was shown that temperature dependence of the Gibbs free energy of C-60 solvation in the individual solvents is controlled by the entropy term. (C) 2006 Elsevier B.V. All rights reserved.