憎水性三金属纳米粒子的合成、表征及磁性

影像科学与光化学 , 2010, 28(3): 173-181.

憎水性三金属纳米粒子的合成、表征及磁性

戴兢陶 ^1, , 王新红 ^2, , 孙玉凤 ^3, , 沈明 ^4,

1.盐城师范学院,江苏省滩涂生物资源与环境保护重点建设实验室,江苏,盐城,224051;盐城师范学院,化学化工学院,江苏,盐城,224051

2.盐城师范学院,化学化工学院,江苏,盐城,224051

3.盐城师范学院,化学化工学院,江苏,盐城,224051

4.盐城师范学院,江苏省滩涂生物资源与环境保护重点建设实验室,江苏,盐城,224051;扬州大学,化学化工学院,江苏,扬州,225002

基金项目: 江苏省高校自然科学基础研究项目(08KJD150020) 江苏省滩涂生物资源与环境保护重点建设实验室项目资助(JLCBE09025;09003)

关键词：反胶束 , 配体交换 , CoFe/Au纳米粒子 , 磁性质

Synthesis, Characterization and Magnetic Properties of Hydrophobic Trimetal Nanoparticles

以磺基琥珀酸二辛酯钠盐(AOT)为表面活性剂,采用反胶束法合成了憎水性CoFe/Au纳米粒子, 利用配体交换、水洗等去除AOT并使纳米粒子分级.采用紫外-可见光谱(UV-Vis)、透射电镜(TEM)、X射线衍射(XRD)、X射线电子能量散射(EDX)及等离子发射光谱 (ICP)等对产物进行了表征,通过超导量子干涉仪(SQIUD)研究了纳米粒子的磁性质.结果表明,反胶束法合成的CoFe/Au三金属纳米粒子具有较好的单分散性和稳定性,平均粒径约为4 nm.当外磁场强度为1.59×104 A/m时,阻塞温度Tb为65 K,温度高于Tb时纳米粒子显示出超顺磁性,低于Tb时呈铁磁性,在5 K时其矫顽力(Hc)达4.67×104 A/m.

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