Issue 30, 2013
From the journal:

RSC Advances

Facile non-hydrolytic synthesis of highly water dispersible, surfactant free nanoparticles of synthetic MFe2O4 (M–Mn2+, Fe2+, Co2+, Ni2+) ferrite spinel by a modified Bradley reaction†

Robert Pązik,*a   Emilia Piasecka,ab   Małgorzata Małecka,a   Vadim G. Kessler,c   B. Idzikowski,d   Z. Śniadeckid  and  Rafał J. Wiglusz*a  

* Corresponding authors

a Institute of Low Temperature and Structure Research, PAS, Okólna 2, 50-422 Wrocław, Poland
E-mail: R.Pazik@int.pan.wroc.pl, R.Wiglusz@int.pan.wroc.pl

b Polymer Engineering and Technology Division, Wroclaw University of Technology, 50-370 Wrocław, Poland

c Department of Chemistry, SLU, P.O. Box 7015, 750 07 Uppsala, Sweden

d Institute of Molecular Physics, PAS, M. Smoluchowskiego 17, 60-179 Poznań, Poland

Abstract

A series of the highly crystalline MFe2O4 ferrite spinel nanoparticles were synthesized via a modified Bradley reaction using microwave stimulation. Particle size was estimated using theoretical calculations from the X-ray data (Scherrer and Rietveld methods) as well as by direct experimental techniques such as TEM, DLS and NTA. The calculated average grain size for dry powders is in the range 10 to 23 nm. Hydrodynamic size was measured using DLS on non-modified, surfactant free particles of the whole MFe2O4 series. Raman spectra used for additional verification of the structure features of the produced spinel phases showed strong asymmetric behavior of the A1g mode, which was deconvoluted revealing additional components. Among all the products the lowest site inversion was found for the manganese ferrite (MnFe2O4). The oxidation of Fe3O4 leading to the formation of the Fe2O3 hematite phase induced by laser irradiation was observed. Magnetic characterization of the MFe2O4 family was carried out, showing that superparamagnetic blocking temperatures and calculated anisotropy constants K are in good agreement with the data for similar fine-particle systems.

Graphical abstract: Facile non-hydrolytic synthesis of highly water dispersible, surfactant free nanoparticles of synthetic MFe2O4 (M–Mn2+, Fe2+, Co2+, Ni2+) ferrite spinel by a modified Bradley reaction

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Article information

DOI
https://doi.org/10.1039/C3RA40763B
Article type
Paper
Submitted
13 Feb 2013
Accepted
20 May 2013
First published
21 May 2013

RSC Adv., 2013,3, 12230-12243

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Facile non-hydrolytic synthesis of highly water dispersible, surfactant free nanoparticles of synthetic MFe2O4 (M–Mn2+, Fe2+, Co2+, Ni2+) ferrite spinel by a modified Bradley reaction

R. Pązik, E. Piasecka, M. Małecka, V. G. Kessler, B. Idzikowski, Z. Śniadecki and R. J. Wiglusz, RSC Adv., 2013, 3, 12230 DOI: 10.1039/C3RA40763B

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