Magnetic Resonance Imaging (MRI) is one of the most widely used imaging tools in medicine for understanding, treating and preventing diseases. The limitations of MRI include low sensitivity and resolution. The sensitivity of existing contrast agents based on Gd and iron oxide nanoparticles remains insufficient. Innovations are needed to develop new, potent contrast agents to enhance the sensitivity and thus capability of MRI in medical research and clinic. Crystalline iron-cobalt (FeCo) alloy exhibits the highest saturation magnetization among all materials, but has not been used for biological and medical applications thus far due to various materials limitations. This application will develop FeCo nanocrystals encapsulated by a single- layer of carbon grapheme into a new, advanced material for MRI. The single-shell grapheme coating protects the FeCo core from degradation and imparts high biocompatibility. The highly magnetic FeCo core affords superior magnetic relativities to conventional agents for MRI. Overall, this application aims to fully develop grapheme-FeCo nanocrystals into a new MRI contrast agent with unprecedented sensitivity, long blood circulation and specific targeting ability. MRI with high spatial resolution down to ~25 This project will apply the principles of nanotechnology to develop a new type of magnetic nanocrystals for both high resolution MRI for cancer imaging and MRI monitored delivery of anti- cancer drugs to tumors. These technological advances will provide doctors with both a greater understanding of cancer and more powerful tools for its treatment.Public Health Relevance
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