Particle size dependence of the magnetic, dielectric and gas sensing properties of Co substituted NiFe2O4 nanoparticles

A Study on Magnetic Removal of Hexavalent Chromium from Aqueous Solutions Using Magnetite/Zeolite-X Composite Particles as Adsorbing Material

“…Magnetite without zeolite-X exhibits a 70 Am 2 kg −1 saturated mass magnetization which is reached in lower magnetic fields < 1.5 T, while magnetite with zeolite-X exhibits a 29 Am 2 kg −1 saturated mass magnetization which is reached in higher magnetic fields > 1.5 T. The lower magnetic moment of the composite particles is an outcome of the complexation of pure magnetite with zeolite-X, as the latter reduces the magnetic properties of the magnetite. The magnetization loops obtained at room temperature exhibit an absence of hysteresis and residual magnetization within the limits of our experimental uncertainty, which is the main characteristic of superparamagnetic behavior of a few nm particle size [50][51][52][53]. It is worth mentioning that the superparamagnetic behavior is the ability of ferromagnetic and ferrimagnetic materials with sizes smaller than 50 nm to get magnetized when an external magnetic field is applied and loses any residual magnetization (instant demagnetization) when the field is removed.…”

Influence of neodymium substitution on structural, magnetic and spectroscopic properties of Ni–Zn–Al nano-ferrites

“…These values of specic surface area were relatively high, indicating that our samples nanoparticles are potential candidates for gas sensing applications. 36 Besides, the external morphology of Ni 0.6 Zn 0.4 Al 0.5 Fe 1.5Àx -Nd x O 4 (x ¼ 0.00 and 0.1) was visualized by SEM. The micrograph of the samples (indicated in Fig.…”

Investigation of the structural, optical, elastic and electrical properties of spinel LiZn2Fe3O8 nanoparticles annealed at two distinct temperatures

“…However, the high surface area value of LiZn 2 Fe 3 O 8 nanoparticles suggests that Zn500 nanoparticles could be used as sensors for detecting gases. 24 The high-resolution TEM image of a single grain (singlecrystalline nature) is shown in Fig. 2(d).…”