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Biosynthesis of Zinc Substituted Magnetite Nanoparticles with Enhanced Magnetic Properties

机译：具有增强的磁性的锌取代磁铁矿纳米颗粒的生物合成

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摘要

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 Ceobacter sulfurreducens. Results indicate a significant 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.
机译：通过在微生物驱动的合成过程中添加锌，磁铁矿纳米颗粒的磁矩得到了显着增强。通过铁还原细菌Ceobacter sulfreducens还原含有Zn（Ⅱ）的Fe（Ⅲ）化合物来生产颗粒。结果表明，相对少量的锌替代，在室温和低温下，与磁铁矿相比，饱和磁化强度显着提高了50％以上。在室温下测得样品的最大饱和磁化强度接近100 emu g〜（-1）。阳离子位点排序的分析揭示了对Zn含量的复杂依赖性，四面体位点上的Fe〜（3+）离子被Zn取代以及Fe〜（2+）阳离子氧化的综合作用，导致观察到的磁化强度低锌掺杂水平的增强。改进的磁性能在MRI应用中提供了卓越的性能，其中MRI对比度增强达到了所报道的最大值，是在相同条件下测得的商用对比剂（Feridex）的5倍以上。此处应用的合成技术涉及环境友好的途径，并提供了调节磁性纳米粒子的磁性能的潜力，同时增加了许多不同商业应用所需的总体磁化强度。

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  • 来源
    《Advanced Functional Materials》 |2014年第17期|2518-2529|共12页
  • 作者

    James M. Byrne; Victoria S. Coker; Eva Cespedes; Paul L. Wincott; David J. Vaughan; Richard A. D. Pattrick; Gerrit van der Laan; Elke Arenholz; Floriana Tuna; Martin Bencsik; Jonathan R. Lloyd; Neil D. Telling;

  • 作者单位

    School of Earth, Atmospheric and Environmental Sciences Williamson Research Centre for Molecular Environmental Science, University of Manchester, Manchester, M13 9PL, UK,Department of Geosciences University of Tuebingen Center for Applied Geoscience Sigwartstrasse 10 72076, Tuebingen, Germany;

    School of Earth, Atmospheric and Environmental Sciences Williamson Research Centre for Molecular Environmental Science, University of Manchester, Manchester, M13 9PL, UK;

    Institute for Science &. Technology in Medicine Keele University Stoke-on-Trent ST4 7QB, UK;

    School of Earth, Atmospheric and Environmental Sciences Williamson Research Centre for Molecular Environmental Science, University of Manchester, Manchester, M13 9PL, UK;

    School of Earth, Atmospheric and Environmental Sciences Williamson Research Centre for Molecular Environmental Science, University of Manchester, Manchester, M13 9PL, UK;

    School of Earth, Atmospheric and Environmental Sciences Williamson Research Centre for Molecular Environmental Science, University of Manchester, Manchester, M13 9PL, UK;

    Diamond Light Source Didcot, Oxfordshire, OX11 ODE, UK;

    Advanced Light Source Lawrence Berkeley National Laboratory Berkeley, CA, 94720, USA;

    School of Chemistry University of Manchester Manchester, M13 9PL, UK;

    College of Arts and Science School of Science &. Technology Nottingham Trent University Burton Street, Nottingham, NG1 4BU;

    School of Earth, Atmospheric and Environmental Sciences Williamson Research Centre for Molecular Environmental Science, University of Manchester, Manchester, M13 9PL, UK;

    Institute for Science &. Technology in Medicine Keele University Stoke-on-Trent ST4 7QB, UK;

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