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Copper ferrite CuFe2O4 nanoparticles were synthesized by sol-gel method with different annealing temperatures (200, 450, 650 and 850) °C. Structural, morphological, magnetic and electrical properties were studied using X-ray diffraction (XRD), transmission electron microscopy (TEM), field emission scanning electron microscopy (FE-SEM), Fourier transform infrared spectroscopy (FT-IR), vibrating sample magnetometer (VSM) and LCR meter. The XRD patterns showed the system structure in Cu-ferrite had deformed at 650 °C from a cubic to a tetragonal system with apparrent a secondary phase CuO. Lattice constant decreases with increasing annealing temperatures, while crystalline volume increases. The FT-IR spectrum of sample under investigations shows two significant absorption bands, which refer to the formation of a single-phase cubic spinel. Magnetization revealed a soft ferromagnetic behavior for the composition sintered at 850 °C. The saturation magnetization, remnant magnetization, and coercivity were 32 emu.g−1, 11.64 emu.g−1, 517.16 emu.g−1, respectively. The electrical measurement of sample shows decrease in the real and imaginary part of dielectric constant with increasing frequency while and AC conductivity increasing.

Magnesium ferrite is a visible light absorber, and when combined with multiwall carbon nanotubes (MWCNTs), it can lead to low electron-hole recombination rates, thus improving its photocatalytic activity. In this work, a novel MgFe 2 O 4 /CNTs nanocomposite catalyst has been synthesized via anchoring MgFe 2 O 4 nanoparticles onto MWCNTs surface by a sol-gel and microwave-assisted route. The prepared catalyst was characterized by X-ray diffraction, Fourier-transform infrared spectroscopy, scanning and transmission electron microscopy, energy-dispersive x-ray analysis and vibrating scanning magnetometry. MgFe 2 O 4 nanoparticles showed a cubic inverse spinel ferrite structure, while MgFe 2 O 4 /CNTs nanohybrids showed combinations of both structures. Morphology studies including Brunauer-Emmett-Teller (BET) analysis confirmed a 40 m 2 g -1 specific surface area with narrow mesoporous size distribution for the MgFe 2 O 4 /CNTs nanocomposite. The photocatalytic performance of the new catalyst was assessed by photodegradation of methylene blue (MB). The experimental results demonstrated that MgFe 2 O 4 /CNTs exhibited strong photocatalytic activity, catalysing the photooxidation of about 98% of MB in 25 minutes under sunlight.

Most nanomedicines that attack tumors by Reactive Oxygen Species (ROS) based on lipid peroxidation mechanisms require external activation to work. The leading example is Photodynamic Therapy (PDT), for which an...

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Water (W) and oil (O) normally mix during production and while passing through valves and pumps to form a persistent water-in-oil (W/O) emulsion, which is a serious restriction in oil production and transporting and refining processes. The objective of this work is to treat emulsions of two crude oil samples labeled KD1 and DGH2 using commercial polymers and surfactants which are also known as demulsifiers. Hydrophile–lipophile balance (HLB) in the demulsifier structure has demonstrated a great effect on breaking W/O emulsion. Emulsion breakers with low HLB value showed better reduction in the dynamic IFT, high diffusivity at the W/O interface, and accelerated coalescence of water droplets. Concomitantly, high emulsion temperatures were found to reduce the interfacial film viscosity and accelerate water droplets coalescence. A maximum water separation efficiency (WSE) of 97% was achieved in the case of KD1 and 88% for DGH2, and using a (1:1) polymer blend demulsifier further increased WSE to 99% after 100 min.