Solubility of Vitamin D₃ in Six Organic Solvents at Temperatures from (248.2 to 273.2) K

The solubility of Vitamin D₃ in methanol, ethanenitrile, ethyl ethanoate, ethanol, propan-2-one, and propan-1-ol was measured in the temperature range from (248.2 to 273.2) K by the static equilibrium method. The results revealed that the solubility of Vitamin D₃ in solvents was observed to decrease in the order of propan-1-ol > ethanol > ethyl ethanoate > propan-2-one > methanol > ethanenitrile. The minimum mole fraction solubility of 7.61·10^–5 was obtained in ethanenitrile at 248.2 K, while the maximum mole fraction solubility up to 0.193 was obtained in propan-1-ol at 273.2 K. Moreover, the solubility data were correlated with the simplified thermodynamic equation and the modified Apelblat equation, and the calculated solubility for all solvents above was in good agreement with the experimental data in the temperature range of interest

Effect of the Ionic Liquid 1-Butyl-3-Methylimidazolium Tetrafluoroborate on the Properties of Water + Triton X-100 + Hexanol + Cyclohexane Microemulsions

A study was carried out concerning the effects of an ionic liquid (IL) 1-butyl-3-methylimidazolium tetrafluoroborate (bmimBF₄) on the properties of nonionic surfactant-based H₂O + Triton X-100 (TX-100) + hexanol + cyclohexane microemulsions. Several properties of microemulsions, such as polarity, conductivity, viscosity, and droplet size, were investigated with the mass ratio of TX-100/hexanol/cyclohexane = 3:2:7. With the addition of IL, the polarity of the microemulsions increases. Conductivity results reveal that the onset water content of electrical percolation decreases with the presence of IL and continues to decrease as the amount of IL increases. The viscosity of microemulsions increases with the increasing amount of IL. Dynamic light scattering (DLS) measurements indicate that the droplet sizes of microemulsions increase with the addition of IL. All results presented in this study suggest that the IL is solubilized into the polar core of microemulsions