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Gold‐loading magnetic core–shell organic/inorganic nanocomposites: facile preparation and multiple properties
Author(s) -
Chen Lingnan,
Zeng Birong,
Wu Yueguang,
Xie Jianjie,
Yu Shirong,
Yuan Conghui,
Luo Weiang,
Xu Yiting,
Dai Lizong
Publication year - 2014
Publication title -
polymers for advanced technologies
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.61
H-Index - 90
eISSN - 1099-1581
pISSN - 1042-7147
DOI - 10.1002/pat.3352
Subject(s) - materials science , colloidal gold , nanocomposite , nanoparticle , chemical engineering , composite number , aqueous solution , zeta potential , dynamic light scattering , polymerization , emulsion polymerization , magnetic nanoparticles , nanotechnology , composite material , polymer , organic chemistry , chemistry , engineering
Magnetic composite nanospheres (MCS) were first prepared via mini‐emulsion polymerization. Subsequently, the hybrid core–shell nanospheres were used as carriers to support gold nanoparticles. The as‐prepared gold‐loading magnetic composite nanospheres (Au‐MCS) had a hydrophobic core embed with γ ‐Fe 3 O 4 and a hydrophilic shell loaded by gold nanoparticles. Both the content of γ ‐Fe 3 O 4 and the size of gold nanoparticles could be controlled in our experiments, which resulted in fabricating various materials. On one hand, the Au‐MCS could be used as a T 2 contrast agent with a relaxivity coefficient of 362 mg −1 ml S −1 for magnetic resonance imaging. On the other hand, the Au‐MCS exhibited tunable optical‐absorption property over a wavelength range from 530 nm to 800 nm, which attributed to a secondary growth of gold nanoparticles. In addition, dynamic light scattering results of particle sizing and Zeta potential measurements revealed that Au‐MCS had a good stability in an aqueous solution, which would be helpful for further applications. Finally, it showed that the Au‐MCS were efficient catalysts for reductions of hydrophobic nitrobenzene and hydrophilic 4‐nitrophenol that could be reused by a magnetic separation process. Copyright © 2014 John Wiley & Sons, Ltd.