Cytotoxicity of thermoresponsive core/shell Ni _x Co_{1− x} Fe₂O₄/PEG nanoparticles synthesized by the sol–gel method

Abstract

These days, magnetic nanoparticles (MNPs), especially cobalt ferrite MNPs, have attracted the attention of many scientists in many applications, e.g. cancer treatment, due to their good magnetic properties. In this study, firstly the Ni x Co1−x Fe2O4 MNPs (x = 0, 0.25, 0.5, and 0.75) were prepared through the sol–gel technique. The resulting particles were then coated with polyethylene glycol (PEG) polymer to obtain a core/shell structure. The x-ray diffraction and Fourier-transform infrared spectroscopy results illustrated that CoFe2O4 MNPs were successfully synthesized. Vibrating-sample magnetometer and (3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bro-mide) assay results illustrated that the Ni0.5Co0.5Fe2O4 sample had the best saturation magnetization (71.68 emu g−1) and coercivity (∼500 Oe) values. Subsequently, the appropriate amount of PEG was found to be 15% wt/vol. The toxicity test showed that a concentration of 100 μg ml−1 of particles kept 96% of the cells alive. The particle size of the core/shelled MNPs was obtained to be ∼25 nm via a transmission electron microscopy image. Finally, it was observed that the Ni0.5Co0.5Fe2O4 sample coated with 15% wt/vol. PEG can be potentially used for hyperthermia.

Three-dimensional embroidered ball-like α-Fe2O3 synthesised by a microwave hydrothermal method as a sulfur immobilizer for high-performance Li–S batteries

“…Meanwhile, when the microwave heating time reaches 25 min, the sharp peaks appear at 546 cm −1 and 451 cm −1 , which corresponds to Fe–O and indicates the generation of α-Fe 2 O 3 . 36,37 Fig. 3d reveals the Raman spectra of the α-Fe 2 O 3 /GO-S-25 composite.…”

An overview of materials, processing, and applications for wearable electronics

“…A manufactured stretchable conductor by simple printing or coating liquid metal on an electrospun elastomeric fiber mat was reported by Ma et al (Fig. 3) [33]. The hung-liquid metal among the elastomeric fibers is self-organized into a mesh-like lateral and buckled vertical structure, providing simultaneous properties of high electrical stability, conductivity, stretchability, and permeability [34].…”

A review on zinc oxide composites for energy storage applications: solar cells, batteries, and supercapacitors

“…ZnO has antibacterial properties in darkness at a pH range of 7-8. In addition, ZnO nanoparticles (NPs) display visible fluorescence emission, especially when they are synthesized by sol-gel, while the hydrothermal synthesis method makes them suitable as UV emitters [10][11][12][13].…”