Magnetization of microorganism cells by sol-gel method  

作　　者：CHEN Bo ZHAN TianZhuo LIAN ZhiYang ZHANG DeYuan 

机构地区：[1]705 Lab,Department of Mechanical Engineering and Automation,Beihang University,Beijing 100083,China

出　　处：《Science China(Technological Sciences)》2008年第5期591-597,共7页中国科学（技术科学英文版）

基　　金：the National Natural Science Foundation of China (Grant No. 59975007);the National Hi-Tech Research and Development Program of China (863 Program) (Grant No. 2001AA421120);the Innovative Fund of Beihang University in 2005 (Grant No.200505)

摘　　要：Microorganism cells could be used as templates during fabrication of magnetic or conductive microstructures in different standard shapes. In this paper, feasibility of magnetizing microorganism cells by sol-gel method, which is to coat cells of Spirulina (a type of natural micro-helical microorganism) with the ferrite (a kind of magnetic material), was discussed and investigated. Then the cell form, components and the phase structure were observed and analyzed using various tools including optical microscopy, scanning electron microscopy (SEM), energy dispersive X-ray detector (EDX), transmission electron microscopy (TEM), and X-ray diffraction analysis (XRD). Results showed that spirulina cells could be coated with ferrite after the sol-gel process, with the shape of natural helixes well kept, that the components of different sampling points on the surface layer were consistent and the thickness of layer was uniform, and that the type of the surface ferrite layer formed was cubic Fe3O4. It was also observed that there were nano-particles yielded in the cells and certain deposit on the walls between cells. The kinetics of the cell magnetization technology by sol-gel was also discussed.Microorganism cells could be used as templates during fabrication of magnetic or conductive microstructures in different standard shapes. In this paper, feasibility of magnetizing microorganism cells by sol-gel method, which is to coat cells of Spirulina (a type of natural micro-helical microorganism) with the ferrite (a kind of magnetic material), was discussed and investigated. Then the cell form, components and the phase structure were observed and analyzed using various tools including optical microscopy, scanning electron microscopy (SEM), energy dispersive X-ray detector (EDX), transmission electron microscopy (TEM), and X-ray diffraction analysis (XRD). Results showed that spirulina cells could be coated with ferrite after the sol-gel process, with the shape of natural helixes well kept, that the components of different sampling points on the surface layer were consistent and the thickness of layer was uniform, and that the type of the surface ferrite layer formed was cubic Fe3O4. It was also observed that there were nano-particles yielded in the cells and certain deposit on the walls between cells. The kinetics of the cell magnetization technology by sol-gel was also discussed.

关 键 词：bio-machining bio-limited MACHINING hollow micro-helixes magnetic particles ferrite 

分 类 号：TM911[电气工程—电力电子与电力传动]