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Fabrication of magnetite nanocrystals in alcohol/water mixed solvents: catalytic and colloid property evaluation

机译：醇/水混合溶剂中磁铁矿纳米晶体的制备：催化和胶体性能评价

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摘要

In this work, Fe3O4 nanocrystals have been synthesized by homogeneous precipitation in different alcohol/water (1 : 1) solvent mixtures at two different temperatures to elucidate the role of the dielectric constant (epsilon) of the reaction medium. The effects of different solvents on the catalytic activity of precipitated NPs in carbon combustion were examined. HRTEM images, SAED and XRD confirmed that the nanocrystals are of pure fcc inverse spinel Fe3O4 phase with narrow size distribution, and the crystals are completely dispersible in water. The morphological features of the nanocrystals, such as their surface termination and shape of the Fe3O4 NPs, were analyzed by HR-TEM. As epsilon decreases, the crystal size decreases for mono-ol systems compared to similar to 13 nm size in water, whereas ethylene glycol/water yields finer similar to 8.2 nm crystals although it has the highest epsilon among the mono-/poly-ols. A soot combustion study demonstrates that the catalytic activity is mainly due to the available surface area along with the exposure of active crystallographic facets. A study of the colloids by light scattering shows that the alcohol mediated process produces 16 to 33 nm MNP clusters composed of 2 to 3 particles in highly stable aqueous magnetic fluids. The relatively high temperature process favors higher crystallinity and particle size with reduced colloidal stability in the aqueous phase. The nanocrystalline powders and the dispersed colloids have excellent potential applications in biotechnology and selective catalysis and also as ferrofluids.
机译：在这项工作中，在两个不同温度下的不同醇/水（1：1）溶剂混合物中通过均匀沉淀合成Fe3O4纳米晶，以阐明反应介质的介电常数（ε）的作用。研究了不同溶剂对碳燃烧中沉淀NPS催化活性的影响。 HRTEM图像，SAED和XRD证实，纳米晶体具有纯FCC逆尖晶石Fe3O4相，具有窄尺寸分布，晶体完全可分散在水中。通过HR-TEM分析纳米晶体的形态学特征，例如其表面终止和Fe 3 O 4 NP的形状。随着ε降低，与水中的相比，单醇系统的晶体尺寸减少，而乙二醇/水收率与8.2nm晶体相似，但是在单/聚醇中具有最高的ε。烟灰燃烧研究表明催化活性主要是由于可用表面积以及有源晶体面的暴露。通过光散射对胶体的研究表明，酒精介导的方法在高度稳定的水性磁性流体中产生16至33nm的MNP簇。相对较高的温度工艺利用水相中降低胶体稳定性的结晶度和粒度更高。纳米晶体和分散的胶体在生物技术和选择性催化中具有优异的潜在应用，也是铁磁流体。

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  • 来源
    《RSC Advances》 |2016年第65期|共11页
  • 作者

    Iyengar Srividhya J.; Joy Mathew; Mohamed A. Peer; Samanta Swati; Ghosh Chandan Kumar; Ghosh Swapankumar;

  • 作者单位

    CSIR Cent Glass &

    Ceram Res Inst Project Management Div Kolkata 700032 India;

    CSIR Cent Glass &

    Ceram Res Inst Project Management Div Kolkata 700032 India;

    CSIR Natl Inst Interdisciplinary Sci &

    Technol NI Funct Mat Sect MSTD Trivandrum 695019 Kerala India;

    CSIR Cent Glass &

    Ceram Res Inst Mat Characterizat &

    Instrumentat Div Kolkata 700032 India;

    Jadavpur Univ Sch Mat Sci &

    Nanotechnol Kolkata 700032 India;

    CSIR Cent Glass &

    Ceram Res Inst Project Management Div Kolkata 700032 India;

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