Behavior of fullerene C60 in xylene-dimethylformamide binary solvents

The formation of colloidal species of fullerene C60 in two component (xylenedimethylformamide) organic solvents was studied for the first time. The results of the study of the refractive index and UV-visible spectra of C60 solutions were accompanied by an analysis of the particle size using the dynamic light scattering (DLS) method. A correlation has been established between the change in the refractive index of the solution and the degree of selforganization of fullerene molecules in solution at different concentrations and storage periods. It is shown that in the xylene-dimethylformamide binary system, the absorption spectra of C60 (~0.22 mg/ml) do not retain spectral features in a pure solvents when the solution is stored after 5 days. It has been established that, over time, the C60-xylene-dimethylformamide solution becomes polydisperse, and the sizes of the resulting fullerene nanoaggregates depend on the initial C60 concentration.