Synthesis, Characterization And Application Of 1-hydroxyethyl-3-alkylimidazolium Based Ionic Liquids

The materials which are liquid state at a room temperature or near the room temperature are named room-temperature ionic liquids (RTILs) or room temperature molten salts. The RTILs is the perfect substitute of conventional solvents owing to its neglectable vapor tension, special solubility, thermal stability, highly conductivity, and wide electrochemical widow. The ionic liquids have been widely used in many fields such as organic synthesis, electrochemistry, and preparation of nanomaterials and so on. The study of RTILs accord with the development of green chemistry, and are paid great attention to by the researchers in world in recent years.Firstly, we have prepared 1-dodecylimidazole and 1-hexadecylimidazole using imidazole and 1-bromododecane or 1-hexadecylbromide as reagent in the autocalve. Then the ionic liquids of 1-hydroxyethyl-3-dodecylimidazolium chloride and 1-hydroxyethyl-3-hexadecylimidazolium chloride are successfully synthesized using 1-dodecylimidazole or 1-hexadecylimidazole and 2-chloroethyl alcohol as reagent. The influencing factors of the reaction are studied and get the optimum processing conditions. ¹H-NMR, FT-IR and UV spectra are employed to identify the molecular structure of intermediate and final product.Secondly, The X-ray diffraction (XRD) and differential scanning calorimetry (DSC) are used to examine the crystal structures and the thermal stability of the ionic liquid, respectively. Then we have determined the physical and chemical properties of 1-hydroxyethyl-3-hexadecylimidazolium chloride, such as melting point, the electrical conductivity, surface tension and so on.Thirdly, inhibiting property of 1-hydroxyethyl-3-hexadecylimidazolium chloride for aluminum in strong hydrochloric acid and sulfuric acid solution are studied by weight-loss method. The corrosion rate of aluminium is determined in the absence and presence of different mass of the ionic liquid in various concentration strong acidic solutions at 60℃, 70℃, 80℃and 90℃. The inhibition efficiency of the ionic liquid is compared with urotropine at the same condition.Finally, VO₂ nanorods are synthesized by hydrothermal method using 1-n-hydroxyethyl-3-hexadecylimi-dazolium chloride as the surfactant and the reducing agent. The product is characterized by XRD and TEM. We also study the capacitance performance and the cell performance of vanadium dioxide.