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Investigation of Viscosity of O-xylene / Fullerene C60 Solutions

In this work, we investigated the viscosity of solutions (nanofluids) of fullerene C60 in o-xylene in the concentration range 0-0.55%, and temperatures from 273 K to 353 K. Measurements have been performed using a capillary method within the ranges of the parameters where the samples were in the state of molecular solutions. We found that additives of fullerene C60 increase the viscosity of o-xylene. The temperature and concentration dependences of the viscosity of solutions (compared to pure o-xylene), the activation parameters of the viscous flow - free energy, enthalpy, and entropy were analyzed. The structural transformations and quantitative assessment of the intermolecular interaction were performed using the activation theory of the viscous flow. The solutions o-xylene/C60 can be considered as thermodynamically similar systems to pure o-xylene. It was established that the concentration dependences of the relative deviations of the kinematic viscosity and the activation parameters of the viscous flow have zones of extremal changes near the same fullerene C60 mass concentrations (0.05 ±0.01)%. We propose a hypothesis about structural changes in a liquid phase of solutions in the presence of the nanoparticle additives.