Synthesis and Properties of MPEG-Coated Superparamagnetic Magnetite Nanoparticles
Synthesis and Properties of MPEG-Coated Superparamagnetic Magnetite Nanoparticles
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MPEG包覆的超顺磁性磁铁矿纳米粒子的合成与性能
DOI：
10.1155/2012/607296
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发表时间：
2012-01-01
影响因子：
--
通讯作者：
Feng, Lingyun
中科院分区：
文献类型：
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作者：
Cao, Xueli;Zhang, Baolin;Feng, Lingyun
通过乙酰丙酮铁(III)在甲氧基聚乙二醇中的热分解合成了磁铁矿纳米粒子，甲氧基聚乙二醇用作反应中的溶剂、还原剂和改性剂。纳米颗粒的形貌和相组成分别通过透射电子显微镜和X射线衍射测定。使用傅里叶变换红外光谱法识别纳米粒子的表面涂层。使用超导量子干涉装置测量磁性。使用纳米粒子和zeta电位分析仪测定纳米粒子的zeta电位和流体动力学尺寸。磁铁矿纳米粒子在 300 K 下表现出超顺磁性行为。与通过乙酰丙酮铁 (III) 在聚乙二醇中热分解合成的磁铁矿纳米粒子相比，带负电荷的甲氧基聚乙二醇涂覆的磁铁矿纳米粒子在水中表现出更长的分散时间和更小的流体动力学尺寸。由于惰性-CH3端基，甲氧基聚乙二醇涂覆的磁铁矿纳米颗粒之间的结合较少，可能导致它们在水分散体中具有更高的稳定性。
The magnetite nanoparticles were synthesized by the thermal decomposition of iron(III) acetylacetonate in methoxy polyethylene glycol, which was used as solvent, reducing agent, and modifying agent in the reaction. The morphologies and phase compositions of the nanoparticles were determined by transmission electron microscopy and X-ray diffraction, respectively. The surface coating of the nanoparticles was recognized using Fourier transform infrared spectroscopy. Magnetic properties were measured using superconducting quantum interference device. The zeta potential and hydrodynamic size of the nanoparticles was determined using nanoparticle and zeta potential analyzer. The magnetite nanoparticles show superparamagnetic behavior in 300 K. The negatively charged methoxy polyethylene glycol-coated magnetite nanoparticles in water exhibited longer-time dispersion with small hydrodynamic size than the magnetite nanoparticles synthesized by the thermal decomposition of iron(III) acetylacetonate in polyethylene glycol. The less conjunction between methoxy polyethylene glycol-coated magnetite nanoparticles due to the inert -CH3 terminal group may cause their higher stability in water dispersion.