疏水性离子液体基银纳米流体的制备及稳定性研究

Synthesis and stability of hydrophobic ionic liquid-based nanofluids

在离子液体/水双液相体系中,以双硫腙为萃取剂,将银离子从水相萃取到离子液体相中,在超声辅助条件下将离子液体相中的银离子还原,制备了银/1-丁基-3-甲基咪唑六氟磷酸(Ag/[BMIm]PF6)纳米流体。制得的纳米流体用纳米粒度仪、透射电子显微镜和紫外-可见分光光度计进行了表征,结果表明,银纳米粒子的平均粒度在11nm左右,在离子液体中分布均匀。双硫腙不仅有效地阻止了纳米粒子间的团聚及氧化,而且增强了纳米粒子在离子液体中的可溶性,使得纳米银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 Ag^＋ was extracted from aqueous phase to ionic liquid phase by the extractant dithizone. Ag / [BMIm] PF6 nanofluid was synthesized by the ultrasound-assisted reduction of Ag^＋ in ionic liquid phase. The nanofluid prepared was characterized by nanoparticle size analyzer, transmission electron microscope and fourier transform infrared spectrometer. The results showed that the mean diameter of the nanoparticles was about 11nm and the nanoparticles were distributed evenly throughout the ionic liquid. Dithizone not only effectively prevented the nanoparticles from agglomeration and oxidation, but also enhanced the solubility of the nanoparticles in ionic liquids, which contributed to the dispersion and the stability of silver nanoparticles in the ionic liquid solvent.