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Publication Citation: Facile Imaging of Giant Meso-Polymers Formed From Polymer Coated Magnetic Nanoparticles Using Fossilized Liquid Assembly

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Author(s): Jason Benkoski; Steven Bowles; Ronald L. Jones; Jack F. Douglas; Jeffrey Pyun; Alamgir Karim;
Title: Facile Imaging of Giant Meso-Polymers Formed From Polymer Coated Magnetic Nanoparticles Using Fossilized Liquid Assembly
Published: August 07, 2008
Abstract: Herein we report the ability to directly image the self-organization of polymer-coated ferromagnetic nanoparticles into one-dimensional mesostructures at a liquid-liquid interface. When polystyrene-coated Co nanoparticles (15 nm) are deposited at an oil/water interface under zero-field conditions, long (~ 5 um) chain-like assemblies spontaneously form, where the precise morphology depends upon particle concentration, temperature, and assembly time. To examine this assembly process, a recently developed platform was utilized consisting of a biphasic oil/water system in which the oil phase can be flash-cured upon UV exposure.The nanoparticle assemblies embedded in the crosslinked phase were then imaged using atomic force microscopy (AFM). Noting the dependence of chain length on the assembly conditions, we observed striking similarities between nanoparticle self-assembly and polymer synthesis. Previous reports on the mechanism and kinetics of equilibrium polymerization provide a useful framework for performing quantitative image analysis on the AFM-visualized mesostructures.
Citation: Macromolecules
Pages: pp. 2267 - 2277
Keywords: atomic force microscopy;colloids;equilibrium polymerization;interfaces;magnetism;polymers;self-assembly
Research Areas: Polymers, MSEL
PDF version: PDF Document Click here to retrieve PDF version of paper (543KB)