Monodisperse Magnetic Nanoparticles: Chemical Synthesis and Potential Applications
February 12 @ 6:30 pm - 8:30 pm PSTFree
Location: Western Digital,
1710 Automation Pkwy
San Jose, CA 95131 United States
Shouheng Sun, firstname.lastname@example.org
Vernon K. Krieble Professor of Chemistry
Department of Chemistry
Providence, Rhode Island 02912, USA
Magnetic nanoparticles are promising building blocks for fabrication of high-performance magnetic materials and highly efficient catalysts for electronic, magnetic, biomedical and energy applications. We demonstrate that monodisperse magnetic nanoparticles of Fe, Co, FePt, CoPt and MFe2O4 (M = Fe, Co, Mn), as well as SmCo5 and Sm2Fe17N3 with controlled sizes, compositions, shapes and structure can be synthesized by solution phase chemical reactions and assembled into 2D and 3D magnetic nanoparticle arrays. The texture in self-assembled arrays is established via the control of nanoparticle shape or via assembly under a magnetic field. Magnetic properties of these arrays are tuned from superparamagnetic to ferromagnetic with controlled magnetization and coercivity (up to 5 T). The Pt- based hard magnetic nanoparticles are also a class of robust catalyst for electrochemical reduction of oxygen or oxidation of fuels in polymer electrolyte membrane fuel cells. These well-engineered magnetic nanostructures are of great importance for magnetic data storage, magnetic energy storage and electrochemical energy conversion applications.
- B. Shen, C. Yu, A. A. Baker, S. K. McCall, Y. Yu, D. Su, Z. Yin, H. Liu, J. Li, S. Sun, “Chemical synthesis of magnetically hard and strong rare-earth metal based nanomagnets”, Angew. Chem. Int. Ed. 2018, doi.org/10.1002/anie.201812007.
- J. Li, Z. Xi, Y.-T. Pan, J. S. Spendelow, P. N. Duchesne, D. Su, Q. Li, C. Yu, Z. Yin, B. Shen, Y. S. Kim, P. Zhang, S. Sun, “Fe Stabilization by Intermetallic L10-FePt and Pt Catalysis Enhancement in L10-FePt/Pt Nanoparticles for Efficient Oxygen Reduction Reaction in Fuel Cells”, J. Am. Chem. Soc. 2018, 40, 2926–2932.
- J. Li, S. Sharma, X. Liu, Y.-T. Pan, J. S. Spendelow, M. Chi, Y. Jia, P. Zhang, D. A. Cullen, Z. Xi, H. Lin, Z. Yin, B. Shen, M. Muzzio, C. Yu, Y. S. Kim, A. A. Peterson, K. L. More, H. Zhu, S. Sun, “Hard-magnet L10-CoPt Nanoparticles Advance Fuel Cell Catalysis”, Joule, 2018, 10.1016/j.joule.2018.09.016.
Shouheng Sun received his BSc from Sichuan University (China) in 1984, MSc from Nanjing University (China) in 1987, and PhD from Brown University in 1996. He joined the IBM T. J. Watson Research Center first as a postdoctoral fellow (1996-1998) and then as a research staff member (1998-2004). In 2005, he returned to Brown as a tenured Associate Professor and was promoted to full Professor in 2007. He is now the Vernon K. Krieble Professor of Chemistry and Professor of Engineering, co-Director of the Institute of Molecular and Nanoscale Innovation of Brown University, Associated Editors of the Royal Society of Chemistry journals Nanoscale/Nanoscale Advances, and the Fellow of the Royal Society of Chemistry. His main research interests are in chemical synthesis and self- assembly of nanoparticles for catalytic, magnetic and biomedical applications.