Sivakumar, Manickam and Towata, Atsuya and Yasui, Kyuichi and Tuziuti, Toru and Kozuka, Teruyuki and Iida, Yasuo and Maiorov, Michail M. and Blums, Elmars and Bhattacharya, Dipten and Sivakumar, Neelagesi and Ashok, M (2012) Ultrasonic cavitation induced water in vegetable oil emulsion droplets - A simple and easy technique to synthesize manganese zinc ferrite nanocrystals with improved magnetization. Ultrasonics Sonochemistry, 19 (3). pp. 652-658. ISSN 1350-4177

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Abstract

In the present investigation, synthesis of manganese zinc ferrite (Mn0.5Zn0.5Fe2O4) nanoparticles with narrow size distribution have been prepared using ultrasound assisted emulsion (consisting of rapeseed oil as an oil phase and aqueous solution of Mn2+, Zn2+ and Fe2+ acetates) and evaporation processes. The as-prepared ferrite was nanocrystalline. In order to remove the small amount of oil present on the surface of the ferrite, it was subjected to heat treatment at 300 C for 3 h. Both the as-prepared and heat treated ferrites have been characterized by X-ray diffraction (XRD), infrared spectroscopy (IR), TGA/DTA, transmission electron microscopy (TEM) and energy dispersion X-ray spectroscopy (EDS) techniques. As-prepared ferrite is of 20 nm, whereas the heat treated ferrite shows the size of 33 nm. In addition, magnetic properties of the as-prepared as well as the heat treated ferrites have also been carried out and the results of which show that the spontaneous magnetization (sigma(s)) of the heat treated sample (24.1 emu/g) is significantly higher than that of the as-synthesized sample (1.81 emu/g). The key features of this method are avoiding (a) the cumbersome conditions that exist in the conventional methods: (6) usage of necessary additive components (stabilizers or surfactants, precipitants) and (c) calcination requirements. In addition, rapeseed oil as an oil phase has been used for the first time, replacing the toxic and troublesome organic nonpolar solvents. As a whole, this simple straightforward sonochemical approach results in more phase pure system with improved magnetization. (C) 2011 Elsevier B.V. All rights reserved.

Item Type:	Article
Uncontrolled Keywords:	Manganese zinc ferrite; Nanoparticles; Ultrasound; Sonochemistry; Cavitation; Magnetization
Subjects:	Electronics
Divisions:	Nano-Structured Materials
Depositing User:	Bidhan Chaudhuri
Date Deposited:	05 Jun 2012 10:10
Last Modified:	13 Mar 2016 17:38
URI:	http://cgcri.csircentral.net/id/eprint/1480

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