Preparation of monodisperse and highly coercive L10-FePt nanoparticles dispersible in nonpolar organic solvents
Preparation of monodisperse and highly coercive L10-FePt nanoparticles dispersible in nonpolar organic solvents
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DOI：
10.1021/cm0616634
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发表时间：
2006-10-31
影响因子：
8.6
通讯作者：
Takano, Mikio
中科院分区：
文献类型：
--
作者：
Yamamoto, Shinpei;Morimoto, Yasumasa;Takano, Mikio
研究了一种制备单分散、高矫顽力L1(0)-FePt纳米颗粒的方法，该纳米颗粒可在甲苯、氯仿和己烷等非极性有机溶剂中分散。通过强力搅拌“sio2 -纳米反应器”法制备的L1(0)-FePt纳米颗粒。理论物理。在NaOH水溶液、氯仿和十六烷基三甲基溴化铵的混合物中，SiO2涂层被溶解掉，裸露的FePt纳米颗粒可以被提取到氯仿相，而不会降低它们的磁性能。在氯仿基溶液缓慢干燥时，这些颗粒表现出形成紧密排列晶格的趋势。目前的成功可能会促进超高密度磁记录的实际应用，也可能为这些粒子提供新的物理和/或化学功能打开大门。
A method to prepare monodisperse and highly coercive L1(0)-FePt nanoparticles that are dispersible in nonpolar organic solvents such as toluene, chloroform, and hexane was developed. By vigorously stirring the SiO2-coated L1(0)-FePt nanoparticles synthesized by the "SiO2-nanoreactor" method (Appl. Phys. Lett. 2005, 87, 032503) in a mixture of an aqueous NaOH solution, chloroform, and hexadecyltrimethlyammonium bromide, the SiO2 coating was dissolved off, and bare FePt nanoparticles could be extracted to the chloroform phase without degrading their magnetic properties. These particles showed a tendency to form a close-packed lattice on slow drying of the chloroform-based solution. The present success may promote the practical application to ultra-high-density magnetic recording and also may open the door to providing these particles with new physical and/or chemical functions.