Nano Archive

Hierarchical magnetite/silica nanoassemblies as magnetically recoverable catalyst-supports

Ge, Jianping and Huynh, Tuan and Hu, Yonping and Yin, Yadong (2008) Hierarchical magnetite/silica nanoassemblies as magnetically recoverable catalyst-supports. NANO LETTERS, 8 (3). pp. 931-934.

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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.

Item Type:Article
Subjects:Material Science > Functional and hybrid materials
Physical Science > Nanomagnetics
Material Science > Nanochemistry
ID Code:1280
Deposited By:Anuj Seth
Deposited On:15 Dec 2008 13:33
Last Modified:19 Jan 2009 09:50

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