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Synthesis of cobalt ferrite colloidal nanoparticle clusters by ultrasonic-assisted solvothermal process
Journal of the Australian Ceramic Society ( IF 1.9 ) Pub Date : 2020-02-19 , DOI: 10.1007/s41779-020-00456-2
Ahmad Reza Abbasian , Zahra Lorfasaei , Masoud Shayesteh , Mahdi Shafiee Afarani

In the present work, cobalt ferrite colloidal nanoparticle clusters were synthesized via solvothermal method using cobalt and iron chlorides, sodium acetate, and ethylene glycol as starting materials. The effects of ultrasonication process of the primary solution on the structure, microstructure, specific surface area, and molecular and magnetic characteristics of the synthesized powders were investigated. Results showed that solvothermal method with/without ultrasonication resulted in nanoscale cobalt ferrite clusters. Field emission scanning electron microscopy micrographs revealed that the synthesized powders were consisted of well-dispersed raspberry-like clusters. Applied ultrasonic waves decreased the mean cluster size while increased the cluster dispersion. The synthesized cobalt ferrite powders had high specific surface area of about 127 m2g−1 which slightly decreased to about 122 m2g−1 after ultrasonication. Generally, the powders showed superparamagnetic properties with a minimum saturation magnetization of 55 emu/g. Ultrasonication for 60 min reduced the coercivity and the effective magneto-crystalline anisotropy of the cobalt ferrite powders.

中文翻译:

超声辅助溶剂热法合成钴铁氧体胶体纳米粒子簇

在目前的工作中,以钴和氯化铁,乙酸钠和乙二醇为原料,通过溶剂热法合成了钴铁氧体胶体纳米颗粒簇。研究了原溶液的超声处理对合成粉末的结构,微观结构,比表面积以及分子和磁性的影响。结果表明,采用/不采用超声处理的溶剂热法产生了纳米级的钴铁氧体簇。场发射扫描电子显微镜显微照片显示,合成的粉末由分散良好的覆盆子状簇组成。施加的超声波减小了平均团簇尺寸,同时增加了团簇分散度。合成的钴铁氧体粉末具有约127 m的高比表面积2 g -1,在超声处理后略微降低至约122 m 2 g -1。通常,粉末表现出超顺磁性,最小饱和磁化强度为55 emu / g。超声处理60分钟可降低钴铁氧体粉末的矫顽力和有效的磁晶各向异性。
更新日期:2020-02-19
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