In situ modification of Fe and Ni magnetic nanopowders produced by the electrical explosion of wire
In situ modification of Fe and Ni magnetic nanopowders produced by the electrical explosion of wire
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DOI：
10.1016/j.jallcom.2013.01.152
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发表时间：
2014-02
影响因子：
6.2
通讯作者：
I. Beketov;A. Safronov;A. Bagazeev;A. Larrañaga;G. Kurlyandskaya;A. Medvedev
中科院分区：
文献类型：
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作者：
I. Beketov;A. Safronov;A. Bagazeev;A. Larrañaga;G. Kurlyandskaya;A. Medvedev
采用电爆丝法制备了平均粒径为50-80 nm的铁、镍球形磁性纳米粒子。该方法的优点在于，它提供了高达200 g/h的非常高的生产率，并且需要25 kW h/kg的低能耗。所制备的MNP在己烷，甲苯，氯仿，和聚苯乙烯在甲苯中的溶液中，在室温下的惰性气氛中原位改性，以提供在环境条件下的稳定性和可调的表面性质。己烷是Fe和Ni MNP的惰性液体。在甲苯的情况下，所制备的Fe或Ni MNP的表面作为芳香族有机化合物的缩合反应形成不规则的多环结构的催化剂。用甲苯处理导致碳的沉积和在MNP表面上形成“毛发状”有序结构。氯仿与Fe MNP发生化学相互作用，形成FeCl 2。用聚苯乙烯的甲苯溶液处理MNP导致聚合物的吸附和在表面上形成3-6 nm的聚合物涂层。在室温下获得的磁性（例如Ni MNP的磁化强度值高达52 emu/g，Fe MNP的磁化强度值高达179 emu/g）使这些MNP成为微波和其他技术应用纳米复合材料的有竞争力的候选者。
Iron and nickel spherical magnetic nanoparticles (MNPs) with mean diameter 50–80 nm were prepared by the electric explosion of wire. The advantage of this method is that it provides a very high production rate up to 200 g/h and requires low energy consumption of 25 kW h/kg. The as-prepared MNPs were modifiedin situin hexane, toluene, chloroform, and the solutions of polystyrene in toluene, in an inert atmosphere at room temperature in order to provide both the stability at ambient conditions and tunable surface properties. Hexane was an inert liquid for Fe and Ni MNPs. In the case of toluene the surface of as-prepared Fe or Ni MNPs acted as a catalyst for the condensation reaction of aromatic organic compounds forming irregular polycyclic structures. The treatment with toluene led to the deposition of carbon and formation of “hair-like” ordered structures on the surface of the MNPs. Chloroform chemically interacted with Fe MNPs, forming FeCl2. The treatment of MNPs with the solution of polystyrene in toluene resulted in the adsorption of polymer and the formation of 3–6 nm polymeric coatings on the surface. The obtained magnetic properties (like the magnetization value for Ni MNPs up to 52 emu/g and Fe MNPs up to 179 emu/g) at room temperature make these MNPs competitive candidates for nanocomposites for microwave and other technological applications.