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化学学报
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化学学报 ›› 2006, Vol. 64 ›› Issue (23): 2351-2356. 上一篇    下一篇

研究论文

纳米γ-Fe2O3粉体的合成与磁性增强研究

梁晓娟1, 朱慧2, 杨宇翔*,2,4, 刘向农3, 陈娅如2, 应海平2   

  1. (1温州大学应用技术学院 浙江 325035)
    (2华东理工大学化学与分子工程学院 上海 200237)
    (3扬州大学测试中心 扬州 225009)
    (4南京大学配位化学国家重点实验室 南京 210093)
  • 投稿日期:2006-02-27 修回日期:2006-06-25 发布日期:2006-12-14
  • 通讯作者: 杨宇翔

A Study on Synthesis of γ-Fe2O3 Powder and Magnetism Enhancement

LIANG Xiao-Juan1; ZHU Hui2; YANG Yu-Xiang*,2,4; LIU Xiang-Nong3; CHEN Ya-Ru2; YING Hai-Ping2   

  1. (1 College of Applied Technology, Wenzhou University, Wenzhou 325035)
    (2 Chemistry Department, East China University of Science & Technology, Shanghai 200237)
    (3 Testing Center, Yangzhou University, Yangzhou 225009)
    (4 State Key Laboratory of Coordination Chemistry, Nanjing University, Nanjing 210093)
  • Received:2006-02-27 Revised:2006-06-25 Published:2006-12-14
  • Contact: Yuxiang Yang

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采用微乳法合成出氧化铁的前驱体——纳米β-FeOOH, 分别以β-FeOOH与添加剂壬基酚聚氧乙烯醚(NP-4)以物质量的比(n)为4, 5, 100添加NP-4, 混合煅烧. 采用拉曼光谱分析了样品中炭含量及分布, 并且用透射电镜观测产物的形貌和粒径, 采用磁强计观测产物磁性的变化. 结果得出, 对n＝5或破乳所得凝胶煅烧, 所得样品皆为分散均匀的四方形颗粒状, 且为磁性明显增强的纳米氧化铁γ-Fe2O3. 还分别讨论了样品中炭含量以及颗粒形状对比饱和磁化强度σs、矫顽力、矩形比的影响.

关键词: NP-4添加剂, γ-Fe2O3, 磁性增强

The nano-β-FeOOH for precursor of γ-Fe2O3 was synthesized by microemulsion method, then the β-FeOOH was calcined by mixing with additive polyoxyethylene nonyl phenyl ether (NP-4) in the molar ratio of β-FeOOH/NP-4 as 4, 5 and 100 respectively. The carbon content and distribution in product were determined by Raman scattering, morphology and particle size of the product were observed by TEM, and the variations of the product magnetism with the morphology were measured by VSM. By calcining β-FeOOH with NP-4 in the molar ratio of 5, or calcining gelatin of broken emulsion, the dispersed symmetrical square γ-Fe2O3 with enhanced magnetism was observed. The effects of carbon content and nanoparticle morphology on saturation magnetization σs, coercive force, and squareness were also discussed in this paper.

Key words: additive NP-4, γ-Fe2O3, magnetic enhancement