Field-induced magnetorheological study towards the active magneto-viscoelastic behavior of stable MnFe2O4 magnetic nanofluid

• Published in: Inorganic chemistry communications 2024-06, Vol.164, p.112434, Article 112434
• Main Authors: Kuldeep, Khan, Mohd. Aamir, Chatterjee, Kaustuv, Pal, Prabir, Basheed, G.A.
• Format: Article
• Language: English
• Subjects: Magnetic nanofluid; Magnetic nanoparticles; Magneto viscous effect; Zeta Potential
• ISSN: 1387-7003; 1879-0259
• DOI: 10.1016/j.inoche.2024.112434

[Display omitted] •Synthesis of highly stable MnFe2O4 magnetic nanoparticles by chemical co-precipitation method.•Functional groups present in oleic acid coated MnFe2O4 magnetic nanoparticles confirmed by Fourier transform infrared spectroscopy (FTIR) technique.•Higher Zeta potential (ζ) along with hydrodynamic size of MnFe2O4 magnetic nanoparticles determined by DLS Zetasizer which confirms the stability of MnFe2O4 magnetic nanofluid (MNF).•Viscoelastic behavior of magnetic nanofluid, validates the fluid stability with strain rate (γ) between 0 and 100 % from magneto-rheological measurements. This work presents the fine-tuned synthesis of MnFe2O4 oleic acid-coated magnetic nanoparticles (MNPs) by the chemical co-precipitation method. The X-ray photoelectron spectroscopy (XPS) was utilized to investigate the elemental composition and oxidation state of oleic acid-coated MnFe2O4 MNPs. The Fourier transform infrared spectroscopy (FTIR) spectra were used to confirm the functional groups in the oleic acid-coated MnFe2O4 magnetic nanoparticles. The spherical shape of MnFe2O4 MNPs is confirmed by Field emission scanning electron microscopy (FESEM) and High-resolution transmission electron microscopy (HRTEM) techniques. Zeta potential (ζ) measurements were performed to confirm the stability of MnFe2O4 magnetic nanofluid (MNF). Magnetic measurements (M−vs−H) reveal the saturation magnetization, Ms = 20.3 emu/g and coercivity, HC = 30 Oe, confirming the single domain superparamagnetic nature at 300 K. Field-induced shear thinning behavior of the MnFe2O4 magnetic fluid is confirmed by a power law, η = c γn + n∞ and steady-state behavior measurements. Magneto viscous effect initially increased at a low shear rate of 20 s−1 and then decreased at a higher shear rate of 100 s−1, which confirms the stability of the MnFe2O4 magnetic fluid. Also, the highest deflection angle, θ = 243 m.rad of MnFe2O4 magnetic fluid was observed at a moderate shear rate 100 s−1 and a high magnetic field of 1.2 T, while the lowest value of deflection angle, θ = 65 m.rad was observed in the absence of magnetic field. In contrast, the storage modulus (G') is greater than the loss modulus (G''), in corroboration with the viscoelastic-to-viscous behavior of MnFe2O4 magnetic fluid.