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• W2589432743 endingPage "e00253" @default.
• W2589432743 startingPage "e00253" @default.
• W2589432743 abstract "Present work describes the formation of α-Fe2O3@SiO2 core shell structure by systematic layer by layer deposition of silica shell on core iron oxide nanoparticles prepared via various solvents. Sol-gel method has been used to synthesize magnetic core and the dielectric shell. The average crystallite size of iron oxide nanoparticles was calculated ∼20 nm by X-ray diffraction pattern. Morphological study by scanning electron microscopy revealed that the core-shell nanoparticles were spherical in shape and the average size of nanoparticles increased by varying solvent from methanol to ethanol to isopropanol due to different chemical structure and nature of the solvents. It was also observed that the particles prepared by solvent ethanol were more regular and homogeneous as compared to other solvents. Magnetic measurements showed the weak ferromagnetic behaviour of both core α-Fe2O3 and silica-coated iron oxide nanoparticles which remained same irrespective of the solvent chosen. However, magnetization showed dependency on the types of solvent chosen due to the variation in shell thickness. At room temperature, dielectric constant and dielectric loss of silica nanoparticles for all the solvents showed decrement with the increment in frequency. Decrement in the value of dielectric constant and increment in dielectric loss was observed for silica coated iron oxide nanoparticles in comparison of pure silica, due to the presence of metallic core. Homogeneous and regular silica layer prepared by using ethanol as a solvent could serve as protecting layer to shield the magnetic behaviour of iron oxide nanoparticles as well as to provide better thermal insulation over pure α-Fe2O3 nanoparticles." @default.
• W2589432743 created "2017-03-03" @default.
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• W2589432743 date "2017-02-01" @default.
• W2589432743 modified "2023-10-16" @default.
• W2589432743 title "Effect of solvents on morphology, magnetic and dielectric properties of (α-Fe 2 O 3 @SiO 2 ) core-shell nanoparticles" @default.
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• W2589432743 doi "https://doi.org/10.1016/j.heliyon.2017.e00253" @default.
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