Abstract
This paper presents the experimental data for the thermal properties of fullerene C60 / o-xylene solutions over a wide range of state parameters. The density was experimentally measured within a fullerene mass concentration range of 0–0.55% and a temperature range 273 K − 353 K. It was shown that the additives of fullerene C60 reduced the density of o-xylene in the concentration range from 0 to (0.05 ± 0.01) wt.%. The temperature and concentration dependences of the isothermal compressibility and density fluctuations were analyzed. It was demonstrated that the temperature dependences of the density fluctuations show up as practically equidistant lines. This fact can be explained due to thermodynamically similar behavior of fullerene C60 / o-xylene solutions and pure o-xylene. We found that the concentration dependences of the isothermal compressibility and density fluctuations in the concentration range of fullerene 0 ≤ wC6 ≤ 0.2% have zones of extremal changes. The zones coincide in the concentration range of fullerene with a zone of extreme decrease in the density. In our opinion, the reason of a nonmonotonous behavior of the thermal properties of fullerene C60 / o-xylene solutions is the effect of fullerene on the density fluctuations of the base liquid as well as a quasicrystalline structure of a liquid phase.
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