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›› 2008, Vol. 8 ›› Issue (1): 162-166.

• 材料工程专栏 • 上一篇    下一篇

介孔二氧化硅微球的扩孔及组装磁性纳米铁粒子

王平,朱以华,杨晓玲,韩霄   

  1. 中国科学院过程工程研究所生化工程国家重点实验室
  • 出版日期:2008-02-20 发布日期:2008-02-20

Assembling Magnetic Iron Nanoparticles in Mesoporous Silica Spheres with Expanded Pore Size

WANG Ping,ZHU Yi-hua,YANG Xiao-ling,HAN Xiao   

  1. National Key Laboratory of Biochemical Engingeering, Institute of Process Engineering, Chinese Academy of Sciences
  • Online:2008-02-20 Published:2008-02-20

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摘要： 以十六胺为模板剂、正硅酸乙酯(TEOS)为硅源合成孔径约3 nm的多孔球形结构介孔二氧化硅(MS)材料. 为满足组装磁性纳米粒子所需的孔径要求，提出了一种可较大程度扩大孔径的方法?复盐浸渍法，用多组分盐溶液(NaC1:LiCl:KNO3=4:1:1, w)浸渍MS微球，然后在300℃加热2 h，扩大MS孔径，扩孔后的MS微球孔径在10 nm左右. 采用电化学方法在MS介孔内合成Fe纳米粒子，并在H2气氛下加热还原得到Fe/SiO2磁性复合微球，制备出的磁性复合微球孔道内均匀地分布着Fe粒子.

关键词: 介孔二氧化硅, 微球, 扩孔, 组装, 磁性纳米粒子

Abstract: Mesoporous silica (MS) microspheres with about 3 nm pore size were synthesized by n-hexadecylamine and TEOS in definite experimental conditions. To facilitate the incorporation of magnetic nanoparticles, an approach for three-ingredient salt impregnating was proposed for expanding the pore size of spheres with large extent. MS spheres were impregnated into three-ingredient salt of NaCl: LiCl:KNO3=20:5:5 (mass ratio) at 300℃ for 2 h to enlarge the pore size of MS spheres. The average pore size of modified MS spheres was about 10 nm. The magnetic nanoparticles within the pores of modified MS microspheres were synthesized by electrochemical method. Finally, the obtained iron-functionalized silica microspheres were thermally reduced under the hydrogen atmosphere to produce iron/silica magnetic composite. The result showed that Fe nanoparticles were incorporated into the pores of MS spheres.

Key words: mesoporous silica, microspheres, pore-expanding, assembly, magnetic nanoparticle