Physico-chemical properties of C-60(OH)(22-24) water solutions: Density, viscosity, refraction index, isobaric heat capacity and antioxidant activity

摘要

This paper investigates the physico-chemical properties of several polyhydroxylated fullerene (fullerenol, C-60(OH)(22-24)) water solutions. The values of densities (rho), refraction indexes (n(D)), isobaric heat capacities (C-p) and viscosities (eta) were experimentally determined in the temperature range 278.15-323.15 K and at fullerenol concentrations up to 40 g.dm(-3). For the highest fullerenol concentration (40 g.dm(-3)), density, viscosity and isobaric heat capacity modifications reach 4.5%, 56%, and 3%, respectively. Either temperature, T, and concentration, x, dependences of these physical properties were described by polynomial fittings or well-known expressions as the Vogel-Fulcher-Tamman equation, while T-x behaviors were described with the use of a second order polynomial function of both temperature and concentration (the standard deviations do not exceed 0.04). The dynamic and structural characteristics of (fullerene-water) and (fullerenol-water) binary systems were determined by using DFT and MD methods. Finally, the study was completed with the characterization of antioxidant activity of the fullerenol. (C) 2018 Published by Elsevier B.V.