Hierarchical magnetite/silica nanoassemblies as magnetically recoverable catalyst-supports
Hierarchical magnetite/silica nanoassemblies as magnetically recoverable catalyst-supports
复制标题
DOI：
10.1021/nl080020f
复制
发表时间：
2008-03-01
期刊：
影响因子：
10.8
通讯作者：
Yin, Yadong
中科院分区：
文献类型：
--
作者：
Ge, Jianping;Huynh, Tuan;Yin, Yadong
我们报道了硅胶体的磁性响应分层组装的合成，可以用作纳米催化剂的可回收支撑。每个组件由一个中央磁铁矿/硅复合核心和许多小卫星硅球组成。这两个区域通过聚n -异丙基丙烯酰胺的聚合物网络作为一个稳定的单元保持在一起。中心磁铁矿颗粒在室温下具有超顺磁性，对外部磁场具有强磁响应，从而为将整个组件从溶液中分离提供了方便的手段。卫星二氧化硅颗粒通过发达的硅烷化学为负载纳米催化剂提供了大的表面积。作为一个例子，我们展示了使用这种磁响应分层组件作为可回收的支持金纳米催化剂与NaBH4还原4-硝基苯酚。
We report the synthesis of magnetically responsive hierarchical assemblies of silica colloids that can be used as recoverable supports for nanocatalysts. Each assembly is composed of a central magnetite/silica composite core and many small satellite silica spheres. The two regions are held together as a stable unit by a polymer network of poly(N-isopropylacrylamide). The central magnetite particles are superparamagnetic at room temperature with strong magnetic response to external fields, thus providing a convenient means for separating the entire assembly from the solution. The satellite silica particles provide large surface areas for loading nanocatalysts through the well-developed silane chemistry. As an example, we demonstrate the use of such magnetically responsive hierarchical assemblies as recoverable supports for Au nanocatalysts for the reduction of 4-nitrophenol with NaBH4.