Abstract
Magnetic core-shell nanoparticles have been widely studied because of their excellent and convenient magnetic and electrical properties.In this present work core-shell magneticnanoparticles (MNPs) were synthesized by simple chemical precipitation method. Firstly Mg(x)Fe(1–x)O (magnesiwuestite) nano powder samples were synthesised by low temperature chemical combustion method. Secondly the as synthesised Mg(x)Fe(1–x)O nanoparticles are used to synthesis magnetic core-shell Nano particles byusing 2-propanol, poly ethylene glycol (PEG), ammonia solution 30 wt%, tetraethyl orthosilicate (TEOS). Separation of the core-shell magnetic nanoparticles from the aqueous suspension using a centrifuge. The synthesised MNPs and core shell MNP were characterized by X-ray diffraction (XRD), Thermal gravimetric-differential thermal analyzer (TG-DTA), Transmission electron microscopy (TEM), scanning electron microscopy (SEM), (EDAX) for structural, thermal and morphological respectively. It is observed that the particle size of spherical sampleis 32.5 nm.
Highlights
IntroductionConsiderable attention has been devoted to the preparation of magnetic nanoparticles because of unique magnetic properties microwaves devices, noise filters, recording heading [1,2,3] and sensors [4]
In the past decades, considerable attention has been devoted to the preparation of magnetic nanoparticles because of unique magnetic properties microwaves devices, noise filters, recording heading [1,2,3] and sensors [4].The core-shell type magnetic nanoparticles can be broadly defined as comprising a core and a shell
The synthesised MNPs and core shell MNP were characterized by X-ray diffraction (XRD), Thermal gravimetric-differential thermal analyzer (TG-DTA), Transmission electron microscopy (TEM), scanning electron microscopy (SEM), (EDAX) for structural, thermal and morphological respectively
Summary
Considerable attention has been devoted to the preparation of magnetic nanoparticles because of unique magnetic properties microwaves devices, noise filters, recording heading [1,2,3] and sensors [4]. The core-shell type magnetic nanoparticles can be broadly defined as comprising a core (inner material) and a shell (outer layer material) These are able to consist of a wide range of different combinations in close interacttion, including inorganic/inorganic, inorganic/organic, organic/inorganic, and organic/organic materials which the inorganic/inorganic interaction has utilized in this paper. For these types of particle core and shell both are made of metal, metal oxide, semiconductor, any other organic compound, or silica.The silica coating used on a core particle has several advantages.The Most basic advantage of silica shell compares to other inorganic compounds, it reduces bulk conductivity, increase the suspension stability of the core particle, it can block the core surface without interfering in the redox reaction at the core surface.
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