Abstract
Understanding the behavior of ionic liquids (ILs) in ionic liquid-based nanofluids has great significance for its proper application. The phase changes and solidification observed in most ILs offer a great challenge to nanoparticles stabilization. Herein, we have synthesized and characterized a new type of IL-based iron oxide nanofluids using 1-butyl-4-methylpyridinium chloride. We have investigated the formation of dendrite-like nanostructures by 1-butyl-4-methylpyridinium chloride at the IL–nanoparticle interface. This solidification induced under high electric field was nanoparticle size dependent and may be controlled by temperature and frequency changes. Examining the rheological behavior showed that higher volume fraction of nanoparticles in this nanofluids drastically decreased the flow viscosity causing a crossover from non-Newtonian (pure IL) to Newtonian and then to shear-thinning behavior. The nanofluid stability also decreased with the increase in nanoparticle size.
Highlights
The formation of nano- or microstructural organizations in ionic liquids (ILs) has an influential effect on their physicochemical properties and performance in various applications [1]
Examining the rheological behavior showed that higher volume fraction of nanoparticles in this nanofluids drastically decreased the flow viscosity causing a crossover from non-Newtonian to Newtonian and to shear-thinning behavior
The present paper deals with the synthesis and characterization of a new type of IL-based nanofluids synthesized using iron oxide nanoparticles synthesized in 1-butylpyridinium chloride by one-step in situ microwave reaction
Summary
The formation of nano- or microstructural organizations in ILs has an influential effect on their physicochemical properties and performance in various applications [1]. Some research groups working on imidazolium IL-based electrospray thrusters for nanopropulsion systems report the formation of radiation-induced needlelike or dendritic structures by ILs [6]. The formation of nano- or microstructural organizations and ion channels in ILs has an influential effect on the performance of various IL-based functional materials [1]. These nanostructural organizations highly enhance its electrical conductivity. 5–10 nm Polydisperse not patchy 10 nm Poly disperse, patchy 20 nm Highly polydisperse, not patchy 20–50 nm Highly polydisperse not patchy
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