(474e) Monolayer Assembly of Monodisperse Nanoparticles for Magnetic and Catalytic Applications
AIChE Annual Meeting
2016 AIChE Annual Meeting
Particle Technology Forum
Wednesday, November 16, 2016 - 9:50am to 10:10am
Specifically, I will discuss the controlled synthesis of monodisperse cobalt ferrite NPs with tunable magnetic properties and the large-area monolayer assembly of these magnetic NPs through the water-air interfacial self-assembly approach.1 The monolayer arrays can be used as magnetic recording media, demonstrating great potentials in magnetic data storage application. This self-assembly approach can be extended to uniform cobalt NPs, which are of great interests for catalyzing OER in water splitting.2In this case, highly stable cobalt NPs are demonstrated to be more active and stable than the state-of-the-art iridium catalyst. More importantly, the well-defined monolayer catalyst of the cobalt NPs enables more detailed study of the intrinsic OER activity of cobalt NPs, showing 15 times higher turnover frequency and mass activity than the NPs deposited on conventional carbon black. These two examples demonstrate the importance of assembling well-defined NPs into ordered monolayer arrays for important technological applications and fundamental studies.
1. Wu, L.; Jubert, P. O.; Berman, D.; Imaino, W.; Nelson, A.; Zhu, H.; Zhang, S.; Sun, S., Monolayer Assembly of Ferrimagnetic CoxFe3-xO4 Nanocubes for Magnetic Recording. Nano Lett. 2014, 14, 3395-3399.
2. Wu, L.; Li, Q.; Wu, C. H.; Zhu, H.; Mendoza-Garcia, A.; Shen, B.; Guo, J.; Sun, S., Stable Cobalt Nanoparticles and Their Monolayer Array as an Efficient Electrocatalyst for Oxygen Evolution Reaction. J. Am. Chem. Soc. 2015, 137, 7071-7074.