Elemental substitution tuned magneto-elastoviscous behavior of nanoscale ferrite MFe2O4 (M = Mn, Fe, Co, Ni) based complex fluids

Abstract

The present article reports the governing influence of substituting the M 2+ site in nanoscale MFe 2 O 4 spinel ferrites by different magnetic metals (Fe/Mn/Co/Ni) on magnetorheological and magneto-elastoviscous behaviors of the corresponding magnetorheological fluids (MRFs). Different doped MFe 2 O 4 nanoparticles have been synthesized using the polyol-assisted hydrothermal method. Detailed steady and oscillatory shear rheology have been performed on the MRFs to determine the magneto-viscoelastic responses The MRFs exhibit shear thinning behavior and augmented yield characteristics under influence of magnetic field. The steady state magnetoviscous behaviors are scaled against the governing Mason number and self-similar response from all the MRFs have been noted. The MRFs conform to an extended Bingham plastic model under field effect. Transient magnetoviscous responses show distinct hysteresis behaviors when the MRFs are exposed to time varying magnetic fields. Oscillatory shear studies using frequency and strain amplitude sweeps exhibit predominant solid like behaviors under field environment. However, the relaxation behaviors and strain amplitude sweep tests of the MRFs reveal that while the fluids show solid-like behaviors under field effect, they cannot be termed as typical elastic fluids. Comparisons show that the MnFe 2 O 4 MRFs have superior yield performance among all. However, in case of dynamic and oscillatory systems, CoFe 2 O 4 MRFs show the best performance. The viscoelastic responses of the MRFs are noted to correspond to a three element viscoelastic model. The study may find importance in design and development strategies of nano-MRFs for different applications. The supplementary material document contains additional information, data, tables and plots of the complex fluid characterization, rheological behavior and additional data on the magnetoelastoviscous response of the fluids.

Influence of temperature and magnetic field on rheological behavior of ultra-sonicated and oleic acid coated cobalt ferrite ferrofluid.

“…This confirm the existence of larger elastic nature, improved energy storage capacity and enhanced viscoelastic system than the previously reported work. It is noteworthy that decreasing the strain rate does not lead to the improvement of the magneto-viscoelastic response of the ferrofluid, similar result was reported by Ankur Chattopadhyay et al [72] but under the action of frequency for manganese ferrite nanofluid.…”

Synthesis and rheological characterization of nano‐magnetorheological fluid using inverse spinel ferrite (NiFe2O4)

“…The strong Brownian motion of nanoparticles inherits the formation of resilient columnar fibrillar structures even at less particle volume concentrations. Furthermore, the shear stress has reached a moderately high value which may be beneficial for practical applications compared to the NiFe 2 O 4 ‐based NMRF reported before 19 and the comparison of nano‐NiFe 2 O 4 ‐based MRF with the literature is shown in Table 5. The change in viscosity with magnetic flux density is presented in Figure 8B.…”

The Effect of Sr-CoFe2O4 Nanoparticles with Different Particles Sized as Additives in CIP-Based Magnetorheological Fluid

“…As such, the attractive forces between the particles of the Sr-CoFe 2 O 4 -T400 sample were greater than in the Sr-CoFe 2 O 4 -T300 sample. This higher attractive force between particles strengthens the chain structure of MRF particles thereby increasing the yield stress [46]. Figure 8 shows the correlation between storage modulus and loss modulus against shear strain during oscillatory testing at a constant frequency of 6.28 rad/s.…”