Electron-Irradiation Induced Nanocrystallization of Pb（ll） in Silica Gels Prepared in High Magnetic Field  

作　　者：Takamasa Kaito Atsushi Mori Chihiro Kaito 

机构地区：[1]Graduate School of Engineering, Tokushima University, Tokushima 770-8506, Japan [2]Institute of Technology and Science, Tokushima University, Tokushima 770-8506, Japan [3]Department of Nanophysics in Frontier Project, Ritsumeikan University, Shiga 535-8577, Japan

出　　处：《Journal of Chemistry and Chemical Engineering》2015年第1期61-66,共6页化学与化工（英文版）

摘　　要：In a previous study, structure of silica gels prepared in a high magnetic field was investigated. While a direct application of such anisotropic silica gels is for an optical anisotropic medium possessing chemical resistance, we show here their possibility of medium in materials processing. In this direction, for example, silica hydrogels have so far been used as media of crystal growth. In this paper, as opposed to the soft-wet state, dried silica gels have been investigated. We have found that lead （II） nanocrystallites were formed induced by electron irradiation to lead （ll）-doped dried Hydrogels made from a sodium metasilicate solution doped with silica gels prepared in a high magnetic field such as B = 10 T. lead （II） acetate were prepared. The dried specimens were irradiated by electrons in a transmission electron microscope environment. Electron diffraction patterns indicated the crystallinity of lead （II） nanocrystallites depending on B. An advantage of this processing technique is that the crystallinity can be controlled through the strength of magnetic field B applied during gel preparation. Specific skills are not required to control the strength of magnetic field.

关 键 词：Silica gel magnetic field NANOCRYSTALLITE electron irradiation. 

分 类 号：TQ127.2[化学工程—无机化工] O614.433[理学—无机化学]