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首页> 外文期刊>RSC Advances >Insight into magnetite nanoparticle phase evolution in solvothermal synthesis through a simple method based on iron chloride and metallic iron
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Insight into magnetite nanoparticle phase evolution in solvothermal synthesis through a simple method based on iron chloride and metallic iron

机译：通过基于氯化铁和金属铁的简单方法洞悉溶剂热合成中的磁铁矿纳米颗粒相演化

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This paper presents the development and optimization of the synthesis of magnetic nanoparticles composed of iron oxides by a solvothermal method with benzyl alcohol using iron(III) chloride hexahydrate as a metallic precursor in the substitution of iron(III) acetylacetonate. The synthesis parameters were studied and varied to obtain a high yield of magnetite. Metallic iron was evaluated as a reducing agent and iron source. Furthermore, the use of urea as a precipitation agent was crucial to increasing the yield of magnetite, at once reducing the acidity of the medium and inducing the precipitation of Fe2+ ions. Longer treatment times and no stirring led to an increase in the yield of magnetite, whose formation process followed the Ostwald step rule. The particles were characterized by X-ray diffraction, Mossbauer spectroscopy, FTIR, TEM, SEM-FEG and VSM (Vibrating Sample Magnetometry). The phases were quantified by the Rietveld method and Mossbauer spectroscopy, and a 97% maximum yield of magnetite was achieved. The polymerization of benzyl alcohol during the solvothermal treatment was shown to play an important role in the nanoparticle capping. The polymerized resin was characterized by FTIR and NMR-H-1, and a mechanism for the polymerization reaction was proposed to elucidate the synthetic route and its relationship to particle formation and stability.
机译：本文介绍了溶剂热法与苯甲醇的溶剂热法合成六氧化三铁磁性纳米粒子的发展和优化，该方法以六水合氯化铁（III）为金属前体代替乙酰丙酮铁（III）。研究和改变了合成参数以获得高产量的磁铁矿。评价金属铁作为还原剂和铁源。此外，使用尿素作为沉淀剂对于提高磁铁矿的产量，同时降低介质的酸度和诱导Fe2 +离子的沉淀至关重要。更长的处理时间和不搅拌导致磁铁矿的产量增加，磁铁矿的形成过程遵循Ostwald步骤规则。通过X射线衍射，Mossbauer光谱，FTIR，TEM，SEM-FEG和VSM（振动样品磁力法）对颗粒进行表征。通过Rietveld方法和Mossbauer光谱对相进行定量，磁铁矿的最大收率达到97％。溶剂热处理中苯甲醇的聚合反应在纳米颗粒封盖中起着重要作用。通过FTIR和NMR-H-1对聚合树脂进行了表征，并提出了一种聚合反应机理，以阐明合成途径及其与颗粒形成和稳定性的关系。

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