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Journal of Nanoparticle Research

, Volume 13, Issue 12, pp 7167–7176

First Online: 27 November 2011Received: 04 October 2010Accepted: 03 November 2011

Abstract

We present a novel and facile method enabling synthesis of iron oxide nanoparticles, which are composed mainly of maghemite according to X-ray diffraction XRD and Mössbauer spectroscopy studies. The proposed process is realized by anodic iron polarization in deaerated LiCl solutions containing both water and ethanol. Water seems to play an important role in the synthesis. Morphology of the product was studied by means of transmission electron microscopy and XRD. In the solution containing almost 100% of water a black suspension of round shaped maghemite nanoparticles of 20–40 nm size is obtained. Regulating water concentration allows to control nanoparticle size, which is reduced to 4–6 nm for 5% of water with a possibility to reach intermediate sizes. For 3% or lower water concentration nanoparticles are of a needle-like shape and form a reddish suspension. In this case phase determination is problematic due to a small particle size with the thickness of roughly 3 nm. However, XRD studies indicate the presence of ferrihydrite. Coercivities of the materials are similar to those reported for nanoparticle magnetite powders, whereas the saturation magnetization values are considerably smaller.

KeywordsMagnetic nanoparticles Iron oxide Maghemite Magnetite Electrochemical synthesis  Download fulltext PDF



Author: Maria Starowicz - Paweł Starowicz - Jan Żukrowski - Janusz Przewoźnik - Andrzej Lemański - Czesław Kapusta - Jacek Ban

Source: https://link.springer.com/







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