Nano Archive

Monodisperse magnetizable silica composite particles from heteroaggregate of carboxylic polystyrene latex and Fe3O4 nanoparticles

Lu, Ziyang and Qin, Yaqiong and Fang, Jianyong and Sun, Jing and Li, Jun and Liu, Fengqi and Yang, Wensheng (2008) Monodisperse magnetizable silica composite particles from heteroaggregate of carboxylic polystyrene latex and Fe3O4 nanoparticles. NANOTECHNOLOGY, 19 (5).

Full text is not hosted in this archive but may be available via the Official URL, or by requesting a copy from the corresponding author.

Official URL: http://www.iop.org/EJ/abstract/0957-4484/19/5/0556...

Abstract

Monodisperse magnetizable silica composite particles were prepared from heteroaggregates of carboxylic polystyrene latex and Fe3O4 nanoparticles. It was found that the heteroaggregation of the carboxylic latex and Fe3O4 nanoparticles is dependent on the pH of the solution. At low pH value (pH = 2-4), the aggregation proceeds effectively due to opposite charges on the surfaces of the latex and the magnetic nanoparticles. At high pH value (pH > 8), no aggregation was observed due to the negative charge on both the surface of the latex and the magnetic nanoparticles. The heteroaggregate of the latex and magnetic nanoparticles was found to be stable in a wide range of pH values, due to the existence of coordination interactions at the interface of the latex and magnetic nanoparticles. After silica layer coating on the heteroaggregate by the Stober process and removal of the latex by calcination, hollow monodisperse magnetizable silica composite particles are obtained.

Item Type:Article
Subjects:Material Science > Nanofabrication processes and tools
Physical Science > Nanomagnetics
Material Science > Nanochemistry
ID Code:1504
Deposited By:Farnush Anwar
Deposited On:11 Dec 2008 19:13
Last Modified:11 Dec 2008 19:13

Repository Staff Only: item control page