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超细四氧化三铁微粒的制备 总被引:1,自引:0,他引:1
研究了草酸铁(Ⅱ)热分解-丁醇还原法制备四氧化三铁的工艺条件,产物经TEM、S射线衍射、B-H仪和磁天平等手段,测定了颗粒的平均粒径、物相结构和磁性能,产物随反应条件不同其平均粒径在1000~3000nm之间,比饱和磁化强度达120μW_b·m·kg ̄(-1)。 相似文献
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Fe_3O_4是重要的铁氧体材料。传统的制备方法是在CO/CO_2混合气中,于600℃以上还原a-Fe_2O_3。此时,由于反应温度较高,制得的多晶颗粒较大。用氢气还原α-Fe_2O_3制备Fe_3O_4也有报导,但其反应进程不易控制,而且产物中会有α-Fe_2O_3或铁。制备Fe_3O_4的另一个方法是湿法,在70℃-90℃的水溶液中,在NaNO_3存在下进行反应: 相似文献
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纳米四氧化三铁的化学制备方法研究进展 总被引:1,自引:0,他引:1
阐述了纳米四氧化三铁在磁性材料、多功能材料、催化材料以及医学领域的应用现状。对纳米四氧化三铁的制备方法如沉淀法、溶胶-凝胶法、微乳液法、水热与溶剂热法、热分解法、静电纺丝法等做了介绍。分析了各种纳米四氧化三铁材料的形态如纳米颗粒、纳米棒、纳米线、纳米膜、杂化、核壳结构纳米晶等的适用领域。总结了各种制备方法的研究进展,分析了其优缺点并结合作者课题组在纳米四氧化三铁制备方面的研究工作,对纳米四氧化三铁的今后的研究方向作了展望:制备特殊形貌的纳米四氧化三铁材料、减少纳米四氧化三铁的团聚和氧化、多种制备方法的结合以及如何实现大规模工业化生产。 相似文献
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纳米四氧化三铁化学法制备及其应用 总被引:2,自引:0,他引:2
纳米磁性材料作为一种新兴功能材料,由于其独特的物理化学性质,使其在物理、化学等方面表现出与常规磁性材料不同的特殊用途。纳米四氧化三铁就是其中一种多功能磁性材料,在磁记录材料、磁流体、催化、医药、颜料等方面具有广泛的应用。综述了近年来纳米磁性四氧化三铁的液相化学制备方法:共沉淀法、微乳液法、溶胶-凝胶法、溶剂热法等的研究现状以及最新的研究成果,对上述各种制备方法的优缺点进行了分析和比较。介绍了磁性纳米四氧化三铁在磁性液体、磁记录材料、催化、生物医药、微波吸收材料等方面的具体应用以及发展趋势,并提出其今后发展方向。 相似文献
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在浸没式循环撞击流反应器中,以氨水为沉淀剂,用七水合硫酸亚铁和六水合三氯化铁为原料,采用共沉淀法制备了纳米四氧化三铁粒子。考察了搅拌转速、亚铁与三价铁物质的量比、反应温度和溶液pH对所得纳米四氧化三铁的分散性和粒径的影响。采用傅里叶红外光谱仪、透射电镜、X射线衍射仪等对制得的纳米粒子的结构和性能进行了表征。结果表明:用撞击流反应器制备纳米四氧化三铁粒子的最佳工艺条件:亚铁与三价铁物质的量比为1 ∶1,反应温度为40 ℃,搅拌转速为1 600 r/min,以氨水作沉淀剂,最佳pH控制在11.0左右。在上述条件下,可以制备出分散性好、纯度高、平均粒径为10 nm的四氧化三铁粒子。 相似文献
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Chuka Okoli Magali Boutonnet Laurence Mariey Sven Järås Gunaratna Rajarao 《Journal of chemical technology and biotechnology (Oxford, Oxfordshire : 1986)》2011,86(11):1386-1393
BACKGROUND: Magnetic nanoparticles are of immense interest for their applications in biotechnology. This paper reports the synthesis of magnetic iron oxide nanoparticles from two different water‐in‐oil microemulsion systems (ME‐MIONs), their characterization and also their use in purification of coagulant protein. RESULTS: ME‐MIONs have demonstrated to be an efficient binder in the purification of Moringa oleifera protein when compared with the superparamagnetic iron oxide nanoparticles prepared from coprecipitation in aqueous media. The size and morphology of the ME‐MIONs were studied by transmission electron microscopy (TEM) while the structural characteristics were studied by X‐ray diffraction (XRD). The microemulsion magnetic iron oxide nanoparticles (ME 1‐MION and ME 2‐MION) obtained have a size range 7–10 nm. The protein and ME‐MIONs interaction was investigated by Fourier transform infrared spectroscopy (FT‐IR); the presence of three peaks at 2970, 2910 and 2870 cm?1 respectively, confirms the binding of the protein. The purification and molecular weight of the coagulant protein was 6.5 kDa as analyzed by SDS‐PAGE. CONCLUSION: The ME‐MIONs have the advantage of being easily tailored in size, are highly efficient as well as magnetic, cost effective and versatile; they are, thus, very suitable for use in a novel purification technique for protein or biomolecules that possess similar characteristics to the Moringa oleifera coagulant protein. Copyright © 2011 Society of Chemical Industry 相似文献
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以金属制品厂酸洗废液与酸洗污泥为原材料,采用湿式沉淀法制备高性能磁性氧化铁(Fe3O4)颜料。实验采用双氧水为氧化剂,15%石灰浆液调节反应液pH,利用蒸汽加热法为体系升温,以终点Fe3+/Fe2+比为判断依据,分析了废酸/污泥比、原液Fe3+/Fe2+比、反应时间、pH、反应温度对合成Fe3O4产品的影响。结果表明,随着实验不断进行,受空气影响,反应过程中Fe3+/Fe2+比是逐渐升高的;在废酸/污泥比为5∶1、原液Fe3+/Fe2+比为1.60∶1、反应时间为4h、pH为9、反应温度介于80~90℃之间条件下,合成产物色光及吸油量等指标达到氧化铁黑标准要求。本研究解决了行业内酸洗污泥资源化处置的瓶颈问题,为企业带来经济效益及环境效益。 相似文献
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《Journal of Industrial and Engineering Chemistry》2014,20(5):3033-3036
Mixed zinc oxide nanoparticle coated magnetic iron oxide has been prepared by a sol–gel and co-precipitation routes. Magnetic iron oxide nanoparticles were synthesized by co-precipitation of ferric and ferrous ions with ammonia, and then zinc oxide was coated onto the surface of magnetic iron oxide by hydrolysis of zinc precursors. As a result, zinc oxide coated magnetic iron oxide nanoparticles with an average size of 68 nm were obtained. The crystalline bacterial cell surface layer)S-layer (used in this study was isolated from Lactobacillus helveticus ATCC 12046. The S-layer was adsorbed onto the surface of zinc oxide nanoparticle coated magnetic iron oxide. The nanoparticles were analyzed by X-ray powder diffractometry (XRD), infrared spectroscopy (FTIR), transmission electron microscopy (TEM), and field emission scanning electron microscopy (FESEM) were used to characterize the structural and the chemical features of the nanocomposites. The infrared spectra indicate that the S-layer-nanoparticle interaction occurs. This novel nanoparticle showed admirable potential in adsorption of S-layers on the surface of oxides for drug delivery. 相似文献
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铁泥制高纯氧化铁红的研究 总被引:2,自引:0,他引:2
研究了以生产DSD酸的废渣铁泥为原料制备高纯氧化铁红的新工艺。考察了影响铁泥酸溶、煅烧等过程的各种因素。结果表明,在反应温度80℃,反应时间60min,液固质量比4:1,硫酸用量为理论量的1.1倍,氧化剂用量为铁泥的1%~2%(质量分数)时利用铁泥可以制取高纯度的氧化铁红,转化率可达到97%,质量符合HG/T2574-1994优等品标准。 相似文献