Publication

Article Metrics

Citations


Online attention

Biosynthesis of Zinc Substituted Magnetite Nanoparticles with Enhanced Magnetic Properties

DOI: 10.1002/adfm.201303230 DOI Help

Authors: James Byrne (School of Earth, Atmospheric and Environmental Sciences, Williamson Research Centre for Molecular Environmental Science, University of Manchester) , Victoria Coker (School of Earth, Atmospheric and Environmental Sciences, Williamson Research Centre for Molecular Environmental Science, University of Manchester) , Eva Cespedes (Institute for Science & Technology in Medicine, Keele University) , Paul L. Wincott (School of Earth, Atmospheric and Environmental Sciences, Williamson Research Centre for Molecular Environmental Science, University of Manchester) , David J. Vaughan (School of Earth, Atmospheric and Environmental Sciences, Williamson Research Centre for Molecular Environmental Science, University of Manchester) , Richard Pattrick (School of Earth, Atmospheric and Environmental Sciences, Williamson Research Centre for Molecular Environmental Science, University of Manchester) , Gerrit Van Der Laan (Diamond Light Source) , Elke Arenholz (Advanced Light Source, Lawrence Berkeley National Laboratory) , Floriana Tuna (School of Chemistry, University of Manchester) , Martin Bencsik (College of Arts and Science, School of Science & Technology, Nottingham Trent University) , Jonathan R. Lloyd (School of Earth, Atmospheric and Environmental Sciences, Williamson Research Centre for Molecular Environmental Science, University of Manchester) , Neil Telling (Institute for Science & Technology in Medicine, Keele University)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Advanced Functional Materials , VOL 24 (17) , PAGES 2518 - 2529

State: Published (Approved)
Published: May 2014

Abstract: The magnetic moments of magnetite nanoparticles are dramatically enhanced through the addition of zinc in a microbiologically driven synthesis procedure. The particles are produced through the reduction of Fe(III)-compounds containing Zn(II) by the iron reducing bacterium Geobacter sulfurreducens . Results indicate a signifi cant increase in the saturation magnetization by over 50% compared to magnetite at both room and low temperatures for relatively minor quantities of zinc substitution. A maximum saturation magnetization of nearly 100 emu g −1 of sample is measured at room temperature. Analysis of the cation site ordering reveals a complex dependence on the Zn content, with the combined effect of Zn substitution of Fe 3+ ions on tetrahedral sites, together with Fe 2+ cation oxidation, leading to the observed magnetization enhancement for low Zn doping levels. The improved magnetic properties give superior performance in MRI applications with an MRI contrast enhancement among the largest values reported, being more than 5 times larger than a commercial contrast agent (Feridex) measured under identical conditions.The synthesis technique applied here involves an environmentally benign route and offers the potential to tune the magnetic properties of magnetic nanoparticles, with increased overall magnetization desirable for many different commercial applications.

Journal Keywords: Zinc Ferrite; Fe(Iii) Reduction; Mössbauer; Saturation Magnetization

Subject Areas: Earth Science, Energy, Chemistry


Technical Areas:

Documents:
adfm201303230.pdf

Discipline Tags:



Technical Tags: