文献类型：期刊文献

中文题名：介孔二氧化硅微球的扩孔及组装磁性纳米铁粒子

英文题名：Assembling Magnetic Iron Nanoparticles in Mesoporous Silica Spheres with Expanded Pore Size

作者：王平[1];朱以华[1];杨晓玲[1];韩霄[1]

机构：[1]华东理工大学材料科学与工程学院超细材料教育部重点实验室,上海200237

年份：2008

卷号：8

期号：1

起止页码：162

中文期刊名：过程工程学报

外文期刊名：The Chinese Journal of Process Engineering

收录：CSTPCD;;EI(收录号：20081111147506);Scopus;北大核心:【北大核心2004】；CSCD:【CSCD2011_2012】；

基金：国家自然科学基金资助项目(编号:20236020;20676038)

语种：中文

中文关键词：介孔二氧化硅;微球;扩孔;组装;磁性纳米粒子

外文关键词：mesoporous silica; microspheres; pore-expanding; assembly; magnetic nanoparticle

摘要：以十六胺为模板剂、正硅酸乙酯(TEOS)为硅源合成孔径约3nm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,ω)浸渍MS微球,然后在300℃加热2h,扩大MS孔径,扩孔后的MS微球孔径在10nm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.
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 NaCI： 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 nanopartieles 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.