Spinel ferrites have recently received significant attention due to their high potential for environmental remediation. We herein report highly stable Cu−Mg substituted zinc ferrites, which were achieved for the first time using a sonochemical method. The phase purity and chemical composition of as‐synthesized ferrites were confirmed by using X‐ray diffraction (XRD) and X‐ray photoelectron spectroscopy (XPS). The size, shape, magnetic properties, and morphology of ferrites were characterized by using Transmission electron microscopes (TEM), Energy Dispersive X‐Ray Analysis (EDX), and Vibrating Sample Magnetometer (VSM). The catalytic performance of the synthesized ferrite was observed in the reduction of aqueous 4‐nitrophenol to 4‐aminophenol with NaBH4. The maximal reduction attained by the Zn1‐xCu0.5xMg0.5xFe2O4 nanoferrite (1.5 min) was significantly impactful than that of other ferrites. The rate constant for the reduction of 4‐nitrophenol was determined to be 0.502 min−1, which was higher than previously reported literature values, and the reduction followed pseudo first‐order kinetics. The cation distribution, crystallinity, and morphology of Zn1‐xCu0.5xMg0.5xFe2O4 were found to be responsible for its higher catalytic activity. Further, this research has the potential to be useful in environmental remediation and offers new findings on mixed ferrite.
Y3+ substituted strontium hexaferrites having chemical composition SrYxFe12-xO19 (x= 0.0, 0.5, 1.0, 1.5) were successfully synthesized by sol-gel auto-combustion method. The structural and morphological studies of prepared samples were investigated by using X-ray diffraction technique, energy dispersive X-ray spectroscopy, field emission scanning electron microscopy (FE-SEM) and high-resolution transmission electron microscopy. The X-ray diffraction pattern confirmed the single-phase hexagonal structure of yttrium substituted strontium ferrite and the lattice parameters a and c increased with the substitution of Y3+ ions. The crystallite size also varied with x content from 60 to 80 nm. The morphology was studied by FE-SEM, and the grain size of nanoparticles ranged from 44 to 130 nm. The magnetic properties were investigated by using vibrating sample magnetometer. The value of saturation magnetization decreased from 49.60 to 35.40 emu/g. The dielectric constant decreased non-linearly whereas the electrical dc resistivity increased with the yttrium concentration in strontium hexaferrite.
Metallic biomaterial like stainless steel, Co-based alloy, Ti and its alloy are widely used as artificial hip joints, bone plates and dental implants. However; this alloy releases ions from the surface liable to do serious harm to human bodies. For overcoming surface originated problems, various surface modification technique have been used on the metallic implants. In this study, the nitrogen was implanted by a process of ion implantation at 60 keV with different fluences of 1 x 10 16 , 5 x 10 16 , 1x10 17 and 5 x 10 17 ions/cm 2 . Corrosion resistance of Ti and ion implanted Ti were investigated by an electrochemical test, at 37 0 C in normal saline solution. Tafel extrapolation method was used for calculating corrosion rate. ICP-AES studies were carried out to determine amount of ions leached out from samples when kept immersed in normal saline solution. Corrosion stability and elemental outdiffusion resistance was found to be increased by nitrogen ion implantation. The implanted samples showed variation in the corrosion resistance with varying doses and the sample implanted at 1 X 10 17 ions/cm 2 showed an optimum corrosion resistance.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.