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首页> 外文期刊>Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics >Ultrasonic-assisted in situ synthesis and characterization of superparamagnetic Fe_3O_4 nanoparticles
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Ultrasonic-assisted in situ synthesis and characterization of superparamagnetic Fe_3O_4 nanoparticles

机译：超顺磁性Fe_3O_4纳米粒子的超声辅助原位合成与表征

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摘要

Superparamagnetic Fe_3O_4 nanoparticles were synthesized via a modified coprecipitation method, and were characterized with X-ray diffraction (XRD), vibrating sample magnetometer (VSM), Zeta potential and FT-IR, respectively. The influences of different kinds of surfactants (sodium dodecyl benzene sulfonate, polyethyleneglycol, oleic acid and dextran), temperatures and pH values on the grain size and properties were also investigated. In this method, Fe~(3+) was used as the only Fe source and partially reduced to Fe~(2+) by the reducing agent with precise content. The following reaction between Fe~(3+), Fe~(2+) and hydroxide radical brought pure Fe_3O_4 nanoparticles. The tiny fresh nanoparticles were coated in situ with surfactant under the action of sonication. Comparing with uncoated sample, the mean grain size and saturation magnetization of coated Fe_3O_4 nanoparticles decrease from 18.4 nm to 5.9-9.0 nm, and from 63.89 emu g~(-1) to 52-58 emu g~(-1) respectively. When oleic was used as the surfactant, the mean grain size of Fe_3O_4 nanoparticles firstly decreases with the increase of reaction temperature, but when the temperature is exceed to 80 °C, the continuous increase of temperature resulted in larger nanoparticles.
机译：通过改进的共沉淀法合成了超顺磁性的Fe_3O_4纳米粒子，并分别用X射线衍射（XRD），振动样品磁力计（VSM），Zeta电位和FT-IR表征。还研究了不同类型的表面活性剂（十二烷基苯磺酸钠，聚乙二醇，油酸和右旋糖酐），温度和pH值对晶粒尺寸和性能的影响。在该方法中，Fe〜（3+）被用作唯一的Fe来源，并被精确含量的还原剂部分还原为Fe〜（2+）。 Fe〜（3 +），Fe〜（2+）与氢氧根自由基的后续反应生成了纯的Fe_3O_4纳米粒子。在超声作用下，用表面活性剂原位涂覆微小的新鲜纳米颗粒。与未涂覆的样品相比，涂覆的Fe_3O_4纳米颗粒的平均粒径和饱和磁化强度分别从18.4 nm减小到5.9-9.0 nm，从63.89 emu g〜（-1）降低到52-58 emu g〜（-1）。当使用油酸作为表面活性剂时，Fe_3O_4纳米颗粒的平均粒径首先随着反应温度的升高而减小，但是当温度超过80°C时，温度的连续升高导致纳米颗粒的尺寸增大。

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