氧化还原
纳米颗粒
矿物氧化还原缓冲液
纳米复合材料
氧化物
材料科学
纳米技术
氧化铁纳米粒子
化学工程
硅酸盐
金属
氧化铁
化学
纳米结构
氧气
无机化学
冶金
有机化学
工程类
作者
Dawei Wang,Xiaojing Wang,Zhiwei Li,Miaofang Chi,Yi Li,Yiding Liu,Yadong Yin
出处
期刊:ACS Nano
[American Chemical Society]
日期:2018-09-20
卷期号:12 (11): 10949-10956
被引量:21
标识
DOI:10.1021/acsnano.8b04520
摘要
This study demonstrates that mineral redox buffer, an important concept in geology, can be used to manipulate the migration of nanoparticles and produce nanostructures of unexpected morphologies. Using a silica shell as a redox buffer, we show that iron oxide nanoparticles can be relocated from inside to the outer surface of the silica shell. The migration of iron oxide through silica was initiated by manipulation of the oxygen fugacity conditions at an elevated temperature. During the treatment, iron oxide was absorbed and then separated from the silica shell by the formation and then decomposition of iron silicate (Fe2SiO4). Tuning the relative dimensions of the iron oxide core and silica shell allows control of the shape of the iron oxide-silica composite structures. It is believed that the discovery of the nanoscale redox buffering effect can be extended to control the morphological configuration of other multivalent metal oxide nanocomposite structures by this particular type of template synthesis through manipulation of the chemical-transport properties of nanoscale templates.
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