Effect of Ultrasonication Time on Microstructure, Thermal Conductivity, And Viscosity of Ionanofluids with Originally Ultra-Long Multi-Walled Carbon Nanotubes

Ionanofluids (INFs) combine the advantages of ionic liquids (ILs) and nanofluids. They are characterized by higher thermal conductivity than pure ILs, as well non-flammability enhanced stability conventional Such an augmentation leads to efficient safe heat transfer fluids. The along with rheological characteristics these hybrid systems profoundly depend on protocol preparation. Therefore, in this work, effect ultrasonication time microstructure, conductivity, viscosity INFs containing 0.2 wt% originally ultra-long multi-walled carbon nanotubes (MWCNTs) four different namely 1-propyl-1-methylpyrrolidinium bis(trifluoromethylsulfonyl)imide, 1-butyl-1-methylpyrrolidinium is(trifluoromethylsulfonyl) imide, 1-ethyl-3-methylimidazolium thiocyanate, or tricyanomethanide, was studied. were obtained a two-step method usingan ultrasonic probe. process performed for 1, 3, 10, 30 min ata constant nominal power value 200 W. results showed that shortest sonication time, highest enhancement 12% obtained. extended from 1 caused cutting MWCNTs breaking nanoparticle clusters, leading decrease average length nanotube bundles approx. 70%. This resulted decline even 7.2% small deviations Newtonian behavior INFs.