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Field-Induced Formation of Linear, Mesoscopic Polymer Chains From Ferromagnetic Nanoparticles



Jason Benkoski, Steven Bowles, Bryan Korth, Ronald L. Jones, Jack F. Douglas, Alamgir Karim, Jeffrey Pyun


Polymer-coated ferromagnetic colloids are first assembled with an applied magnetic field and then permanently fixed into one-dimensional mesostructures using a novel liquid-liquid interfacial system known as Fossilized Liquid Assembly. Using polystyrene-coated cobalt nanoparticles, we demonstrate that dispersed ferromagnetic colloids possess sufficient dipolar attractions to organize into mesoscopic assemblies. Field induced assembly of ferromagnetic colloids enabled formation of micron-sized mesoscopic nanoparticle chains. This versatile methodology enabled facile evaluation of different assembly conditions and direct imaging of organized mesostructures using atomic force microscopy. This general and robust methodology allows for optimization of assembly processes and visualization of dispersed nanoparticle morphologies organized at crosslinkable oil-water interfaces.
Nano Letters


complex fluids, interfaces, nanoparticles, photopolymerization, self-assembly


Benkoski, J. , Bowles, S. , Korth, B. , Jones, R. , Douglas, J. , Karim, A. and Pyun, J. (2007), Field-Induced Formation of Linear, Mesoscopic Polymer Chains From Ferromagnetic Nanoparticles, Nano Letters, [online], (Accessed May 26, 2024)


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Created February 2, 2007, Updated February 19, 2017