Suchergebnisse

he behaviors of self-aggregation of C60 molecules in solution of C60/toluene/hexane were studied by the methods of refractometry, ultraviolet-visible spectroscopy, dynamic light scattering (DLS) and electron microscopy. It has been experimentally shown that with a slight increase in both the concentration of C60 fullerene and the volume fraction of toluene in a C60/toluene/hexane solution, a change in the refractive index of the medium and in the behavior of the optical spectrum is observed. An increase in the content of toluene in the solution manifests both a positive solvatochromic effect and a hyperchromic effect in the intense absorption band at 328.8 nm. At the same time, it was established by DLS that with an increase in the mole fraction of toluene in the C60/toluene/hexane system, the size of nanoclusters synthesized inside the solution decreases. After evaporation of hexane/toluene from fullerene solution droplets transferred to a heated substrate (up to 30°C), filamentary crystalline nanostructures based on C60 fullerene are formed on the substrate surface.

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.