Kannan M. Krishnan,Amit Praful Khandhar,Richard M. Ferguson,Scott Jeffrey Kemp
申请号：
US15524589
公开号：
US20180280545A1
申请日:
2015.10.30
申请国别(地区):
US
年份:
2018
代理人:
摘要：
Disclosed herein are iron oxide nanoparticles having an iron (II) content in a metastable state that is intermediate the iron (II) content of wüstite and magnetite. The disclosed iron oxide nanoparticles exhibit unexpectedly beneficial magnetic properties (e.g., saturation magnetization) resulting from both the size of the nanoparticles and the iron (II) content. Accordingly, the iron oxide nanoparticles are attractive for magnetic imaging applications, such as magnetic particle imaging. Methods of forming the iron oxide nanoparticles are also provided, such methods including a controlled oxidation step wherein a small amount (e.g., 1%) of gaseous oxygen is exposed to wüstite nanoparticles for a defined period of time sufficient to partially oxidize the wüstite but prevent conversion entirely to magnetite. Finally, methods of using the iron oxide nanoparticles are also provided. Representative methods include magnetic particle imaging, magnetic resonance imaging, and hyperthermia.
