聚乙烯基吡咯烷酮稳定的离子液体基金纳米流体的制备及稳定性研究

Investigation on synthesis and stability of polyvinylpyrrolidone-stabilized ionic liquid-based nanofluids containing gold nanoparticles

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 the ionic liquid / water two-phase systems, the [AuCl4 ] was extracted from aqueous phase to ionic liq- uid phase by the polyvinylpyrrolidone. The Au / [BMIm] PF6 nanofluids was synthesized by the ultrasound-assisted reduction of Au^3＋ by sodium borohydride in ionic liquid phase. The nanofluids was characterized by nanoparticle size analyzer and transmission electron microscope. The results showed that the mean diameter of the nanoparticies was ahout 11.7 nm and the nanoparticles were distributed evenly throughout the ionic liquid. The IR spectra indicated that there was chemical bond interaction between aurum and polyvinylpyrrolidone. Due to the surface modification effect on the nanoparticles,the polyvinylpyrrolidone not only enhanced the solubility of the nanoparticles in ionic liquids, but also improved the antioxidant ability and the antiaggregation ability of the gold nanoparticles,which contributed to the dispersion and the stability of the gold nanoparticles in the ionic liquid solvent.