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在离子液体/水双液相体系中,以聚乙烯基吡咯烷酮(PVP)为萃取剂,将[AuCl4]-从水相萃取到离子液体相中。在超声辅助条件下用四氢硼钠将离子液体相中的金离子还原,制备了金/1-丁基-3-甲基咪唑六氟磷酸(Au/[BMIm]PF6)纳米流体。制得的金纳米流体用纳米粒度仪和透射电子显微镜进行表征,结果表明,金纳米粒子的平均粒度在11.7nm左右,在离子液体中分布均匀;红外光谱分析结果表明,PVP与金纳米粒子之间存在化学键合作用,对纳米金具有表面修饰的作用,PVP不仅增强了金纳米粒子在离子液体中的溶解性,而且提高了纳米金的抗氧化能力并有效阻止了金纳米粒子间的团聚,使得金纳米粒子在离子液体中有良好的分散性和稳定性。
In an ionic liquid / water two-liquid system, [AuCl4] - was extracted from the aqueous phase into the ionic liquid phase using polyvinylpyrrolidone (PVP) as the extractant. The gold / 1-butyl-3-methylimidazolium hexafluorophosphate (Au / [BMIm] PF6) nanofluid was prepared by the sonication of sodium tetraborohydride in the ionic liquid phase. The prepared gold nanofluid was characterized by means of a nano-particle size analyzer and a transmission electron microscope. The results showed that the average particle size of the gold nanoparticles was about 11.7 nm and was uniformly distributed in the ionic liquid. The infrared spectrum analysis showed that the average particle size of the gold nanoparticles was Chemical bonding between the gold nanoparticles and surface modification of gold nanoparticles. PVP not only enhances the solubility of the gold nanoparticles in the ionic liquid, but also improves the anti-oxidation ability of the gold nanoparticles and effectively prevents the agglomeration of the gold nanoparticles, Making the gold nanoparticles in ionic liquids have good dispersion and stability.