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首页> 外文期刊>Journal of Physics, D. Applied Physics: A Europhysics Journal >Size-controlled synthesis of superparamagnetic iron-oxide and iron-oxide/iron/carbon nanotube nanocomposites by supersonic plasma expansion technique
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Size-controlled synthesis of superparamagnetic iron-oxide and iron-oxide/iron/carbon nanotube nanocomposites by supersonic plasma expansion technique

机译：超声等离子体膨胀技术尺寸控制的超顺磁性氧化铁和氧化铁/铁/碳纳米管纳米复合材料的尺寸控制合成

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摘要

Fine size-controlled synthesis of superparamagnetic iron-oxide and its nanocomposites are reported by a supersonic thermal-plasma assisted process. The effects of oxygen flow rates, gas injection position, and carrier gas types were studied, and the phase composition of the product material was estimated by Rietveld refinement technique. The smallest iron-oxide nanoparticle sample with 10 nm average size was synthesized at 19 liters per minute flow of oxygen, which also had the largest contribution from the magnetite/maghemite phases at 88%. The saturation magnetization and the magnetic coercivity of this superparamagnetic sample were measured as 28 emu g(-1) and 6 Oe, respectively, the latter one is the smallest value reported in the literature produced by a plasma method. The sample demonstrated satisfactory biocompatibility behavior, which should be suitable for advanced bio-medical and environmental applications. A superparamagnetic nanocomposite material containing iron-oxide, carbon-encapsulated iron nanoparticles, along with single-walled carbon nanotubes was also produced while injecting oxygen into the vacuum chamber and using hydrogen as the carrier gas. The average particle size was 5.1 nm, which had saturation magnetization of 52 emu g(-1) and coercivity 10 Oe. The sample was found to be slightly more toxic, assumed due to the presence of the single walled carbon nanotubes. The high rate of production and single step processing were the other important advantages of this synthesis technique for the nanocomposite material.
机译：超声热等离子体辅助工艺报道了超高分子磁性氧化铁及其纳米复合材料的细大尺寸控制的合成。研究了氧气流速，气体注射位置和载气类型的影响，并通过RIETVELD细化技术估算了产物材料的相位组成。具有10nm平均尺寸的最小氧化铁纳米颗粒样品在19升的氧气流下合成了10nm的氧气流量，这也具有88％的磁铁矿/磁石阶段的最大贡献。测量该超顺磁性样品的饱和磁化和磁矫顽力分别为28兆比（-1）和60E，后者是通过等离子体方法产生的文献中报道的最小值。样品展示了令人满意的生物相容性行为，适用于先进的生物医疗和环境应用。在将氧气注入真空室中并使用氢作为载气，还生产含有铁氧化铁，碳包封的铁纳米粒子以及单壁碳纳米管以及单壁碳纳米管的超顺磁性纳米复合材料。平均粒度为5.1nm，其饱和磁化为52 emu g（-1）和矫顽力10 oe。由于存在单壁碳纳米管存在，发现样品稍微略高。高生产率和单步加工是该合成技术对纳米复合材料的其他重要优势。

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