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碳包裹Ni/SiO2核/壳复合纳米颗粒的制备及磁性研究

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摘要 报道了一种简单的通过溶胶-凝胶结合氢气还原制备Ni/SiO2核壳纳米复合颗粒,然后以乙炔为碳源通过在适当温度下裂解乙炔制备碳包裹Ni/SiO2核壳纳米复合颗粒的方法.结果表明,频率直到1GHz所得样品的复合磁导率的实部μ′几乎保持不变,而虚部μ″一直保持在很小的值.本方法提供了一种有效的获得具有好的软磁性能的软磁复合物的方法,尤其是在高频范围.它的物理机制为:由于Ni核之间的非晶氧化硅壳层的绝缘作用,导致了样品的电阻增加,减少了高频阶段的涡流损耗作用,使得复合物的复合磁导率的实部μ′几乎保持不变,而虚部μ″一直保持在很小的值.抗酸性研究表明,通过表面包裹碳,Ni/SiO2核壳纳米复合颗粒的抗酸性大为提高.
出处 《中国科学(G辑)》 CSCD 2008年第11期1518-1523,共6页
基金 江苏省博士后基金 国家重点基础研究发展计划(编号:2005CB623605)资助项目
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参考文献11

  • 1Tartaj P, Morales M D, VeintemiUas V S, et al. The preparation of magnetic nanoparticles for applications in biomedicine. J Phys D: Appl Phys, 2003, 36:R182
  • 2Peng K, Zhou L P, Hu A P, et al. Synthesis and magnetic properties Ni-SiO2 nanocomposites. Mater Chem Phys, 2008, 111 : 34
  • 3Tang N J, Zhong W, Liu W, et al. Synthesis and complex permeability of Ni/SiO2 nanocomposite. Nanotechnology, 2004, 15:1756
  • 4Tang N J, Zhong W, Chen W, et al. Highly stable carbon-coated Fe/SiO2 composites: Synthesis, structure and magnetic properties. Carbon, 2006, 44:423
  • 5Tang N J, Zhong W, Gedanken A, et al. A study of the stability of pyrolytic earbon-coated Fe/SiO2 composites in HNO3 and the effect of pyrolysis temperatures on their magnetic properties. Sofid State Commun, 2007, 142:265
  • 6Zhang Z D, Zheng J G, Skorvanek I, et al. Shell/core structure and magnetic properties of carbon-coated Fe-Co(C) nanocapsules. J Phys Conden Mater, 2001, 13:1921
  • 7Rechenberg H R, Coaquira J A H, Marquina C, et al. Mossbauer and magnetic characterisation of carbon-coated small iron particles. J Magn Magn Mater, 2001, 226:1930
  • 8Murata K, Ushijima H, Uchida K. Simple preparation of carbon-coated iron particles having high iron content. J Jpn Petr Inst, 1998, 41:168
  • 9Babonneau D, Naudon A, Cabioch T, et al. Morphology of encapsulated iron nanoparticles obtained by co-sputtering and implantation: a GISAXS study. J Appl CrystaUogr, 2000, 33:437
  • 10Tomita S, Hikita M, Fujii M, et al. A new and simple method for thin graphitic coating of magnetic-metal nanoparticles. Chem Phys Lett, 2000, 316:361

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