Superparamagnetic Hybrid Nanocylinders
Superparamagnetic Hybrid Nanocylinders
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DOI：
10.1002/adfm.200400064
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发表时间：
2004-09
影响因子：
19
通讯作者：
Mingfu Zhang;C. Estournès;W. Bietsch;Axel H. E. Müller
中科院分区：
文献类型：
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作者：
Mingfu Zhang;C. Estournès;W. Bietsch;Axel H. E. Müller
采用阴离子聚合和原子转移自由基聚合相结合的方法合成了具有聚丙烯酸（PAA）芯和聚丙烯酸正丁酯（PnBA）壳的圆柱形聚合物刷。这些两亲刷子是单分子圆柱形胶束，可以用作合成无机纳米颗粒的单分子模板，因为聚合物核心中的羧酸基（或羧酸基，在中和后）可以与各种金属离子（如Fe3+和Fe2+）配位。通过各种表征技术证实，在这些聚合物刷的核心内成功合成了超细磁性纳米颗粒。Mössbauer光谱和磁化测量表明，混合纳米柱表现出有趣的超顺磁性行为。
Well‐defined cylindrical polymer brushes with poly(acrylic acid) (PAA) cores and poly(n‐butyl acrylate) (PnBA) shells have been synthesized via a combination of anionic polymerization and atom transfer radical polymerization. These amphiphilic brushes are unimolecular cylindrical micelles and can be used as single‐molecular templates for the synthesis of inorganic nanoparticles, because the carboxylic acid groups (or carboxylate groups, after neutralization) in the polymer core can coordinate with various metal ions such as Fe3+ and Fe2+. Ultrafine magnetic nanoparticles were successfully synthesized within the core of these polymer brushes, as confirmed by various characterization techniques. Mössbauer spectroscopy and magnetization measurements indicate that the hybrid nanocylinders exhibit interesting superparamagnetic behavior.