Optical and Thermodynamic Properties of Benzene–Xylene and Benzene–Xylene–C60 Solutions

A systematic experimental investigation of the thermodynamic and optical properties of benzene-xylene binary mixtures and benzene-xylene-C60 ternary systems has been carried out at 300.15 K. Refractive indices, densities, optical absorptions, excess refractive indices, and excess molar volumes were determined for freshly prepared solutions and after 15 days of storage to elucidate intermolecular interactions and time-dependent structural relaxation effects. The combined thermodynamic and spectroscopic results demonstrate that competitive solvation in binary aromatic solvents plays a critical role in governing the structural stability and aggregation behavior of C60 in solution.

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