Synthesis and rheological properties of nickel‐zinc ferrite polymer nanocomposites

Abstract

In this work, the ferrimagnetic nickel-zinc ferrite nanopowder was synthesized via citrate-ethylene glycol processing, followed by the preparation of the epoxy-based nanocomposite. The materials were characterized using X-ray diffraction (XRD), simultaneous thermal analysis (STA), alternative gradient force magnetometer (AGFM), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The results showed that the sample calcined at 1000 C for 1 h had the best crystallinity, and the calculated crystallite size of this sample was $ 105 nm. The rheological properties and the magnetoviscous effect of the nanocomposites were studied by a standard rotating rheometer. The effects of the magnetic fields and shear rate with respect to time were investigated, and the results were discussed in terms of aggregates and magnetic field-induced structures.

Thermo-physical properties and thermo-magnetic convection of ferrofluid

“…This is supported by many works that the viscosity of ferrofluids would increase under the presence of a magnetic field [39][40][41]. Patel [39] used a horizontal viscometer to study the effective viscosity as a function of external magnetic field, parallel, perpendicular, and in other angular directions to the flow.…”

“…They found that either introducing a strong field or decrease the volume fraction resulted in the raise of viscosity, as shown in Figure 6. Moeen et al [41] investigated the rheological properties of ferrofluid by using a standard rotating rherometer with variable magnetic field. The results suggested the presence of a remarkable magnetoviscous effect at a low shear rate.…”

“…Viscosity of ferrofluids and base fluid as a function of shear rate in the presence of magnetic field[41] …”

Synthesis of nickel–zinc ferrite magnetic nanoparticle and dye degradation using photocatalytic ozonation

“…2 illustrates the X-ray diffraction (XRD) patterns of the calcined sample at 600 8C. It is clear that all peaks matching with the standard pattern of NZFMN (JCPDF 08-0234), which was prepared by polymeric precursor method [31]. The average calculated crystallite size from Scherrer's formula [32] using the intensive peak (3 1 1) revealed 31 nm.…”

“…The powder precursor was milled in planetary mono mill (model pulversette 6 Fritsch Gmbh) with zirconium mortar and passed through a 170 mesh sieve. The powder precursor was calcined on alumina crucible at 600 8C for 1 h, with a heating rate of 10 8C/min [31].…”