On the nonmonotonous behavior of the thermal properties of fullerene C60 / o-xylene solutions

Effect of fullerene C60 admixture in paraffin wax on the refractive index and phase transition temperatures

“…With a further decrease in temperature, the glassy s of the refractive index corresregions with two exes of the refractive index of the system . The minimum points on the dependenciesn D (w) have its confirmation with the previously obtained data for other systems [13][14][15][16][17][18][19][20].…”

“…The index of refraction, relative to the air, at a wavelength of 589 nm (sodium D line) was measured. It was revealed in [12,13] that fullerene C 60 in solutions of tetralin and o-xylene at low content does not absorb light of 589 nm wavelength. Convergence of readings of the refractive index is no more than ±5•10 -4 .A circulation thermostat was used to maintain a constant temperature during the refractive index measuring.The water thermostat was equipped with automatic temperature control.…”

“…According to the mentioned, the study of the properties of fullerene solutions in hydrocarbons is of considerable interest. The interfacial layer of base liquid molecules around C 60 molecules is absent in these solutions.At the same time, fullerene C 60 solutions exhibit unusual optical, thermodynamic, kinetic, and other properties [4,11,[13][14][15][16][17][18][19][20]: complex temperature dependence of the solubility of fullerenes in some solvents was revealed in [4,11,16], non-linear nature of the change in some thermophysical properties with concentration at low content of fullerene in solutions was revealed in [13][14][15][17][18][19][20].…”

“…Up to now a lot of studies devoted to investigating the effect of fullerene on the thermophysical properties of liquids were published [4,11,[13][14][15][16][17][18][19][20]. However, the principles of thermodynamic modeling of the nanofluids properties, including properties of solutions of PW/C 60 (the molecule C 60 in the solution can be considered both a nanoparticle and a large molecule [4]), remain developed insufficiently [13,15,21,22].…”

“…Up to now a lot of studies devoted to investigating the effect of fullerene on the thermophysical properties of liquids were published [4,11,[13][14][15][16][17][18][19][20]. However, the principles of thermodynamic modeling of the nanofluids properties, including properties of solutions of PW/C 60 (the molecule C 60 in the solution can be considered both a nanoparticle and a large molecule [4]), remain developed insufficiently [13,15,21,22]. In the opinion of some authors [18][19][20][21][22], the current situation is caused by the absence of an approach for the correct evaluation of the nanoparticles' effect on structural changes in the base fluids.It should be emphasized, that mentioned above concerns not only the formation of an interfacial phase around nanoparticles in a nanofluid but also structural changes in the base fluidat the distance from the nanoparticles.…”