Application Of Cyanex 302 In The Preparation Of Nanomaterial And Organic Nanofluids

Based on the background of the long-term deep study of extractants' surface properties by our team, the application in the preparation of nano-materal and organic nano-fluids of Cyanex 302 have been studied in this dissertation.Firstly, stable fluids containing Bi₂S₃ nano-particles in gasoline have been directly prepared by the extraction-precipitation method. Bismuth nitrate was extracted into the non-polar solvent by thio-substituted phosphinic acid extractant Cyanex302, then Bi(III) in the organic phase was reacted with H₂S for longer than 18h. Stable fluids containing Bi₂S₃ nano-particles were obtained. Simultaneously, Bi₂S₃ nano-particles have been prepared in alcohol-water medium, and then redispersed in organic solvent such as gasoline. Finally fluids containing Bi₂S₃ nano-particles have been obtained. The analysis and characterization using TEM, IR, XRD et.al indicate that there is a chemical bond force between the Bi₂S₃ nano-particles and the extractant Cyanex 302. The extractant, acted as the surface modifier, prevented the particle aggregation and increases the loading amount in the organic solvent. The size of Bi₂S₃ nano-particles prepared by extraction-precipitation method is smaller, and the loading concentration, as high as 19.27gL-1,is much larger than that prepared by "alcohol-water" method. It might open a new route for its manufacture in a large sacle.Secondly, the loaded organic phase of solvent extraction between Cyanex 302 and Bi³⁺ or Mo (VI) is used directly by the solvothermal method to produce Bi₂S₃ nano-rods and M0S2 ball well dispersed in μm range. Some factors influencing the morphology of prepared nano-material are investigated. The XRD shows that the crystal phase of M0S2 ball is the type of 2H. M0S2 has four morphologies of 3H, 2H, 2H₂ and 2T in the JCPDC FILE. Only the crystal phase of 2H type can be applied in...