Field Induced Formation of Mesoscopic Polymer Chains from Functional Ferromagnetic Colloids
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- 作者：Jason J. Benkoski ; Steven E. Bowles ; Bryan D. Korth ; Ronald L. Jones ; Jack F. Douglas ; Alamgir Karim ; Jeffrey Pyun
- 刊名：Journal of the American Chemical Society
- 出版年：2007
- 出版时间：May 16, 2007
- 年：2007
- 卷：129
- 期：19
- 页码：6291 - 6297
- 全文大小：975K
- 年卷期：v.129,no.19(May 16, 2007)
- ISSN：1520-5126
文摘
The assembly and direct imaging of ferromagnetic nanoparticles into one-dimensional mesostructures (1-D) are reported. Polymer-coated ferromagnetic colloids (19 nm, 24 nm) were assembled at acrosslinkable oil-water interface under both magnetic field induced and zero-field conditions and permanentlyfixed into 1-D mesoscopic polymer chains (1-9 
m) in a process referred to as Fossilized Liquid Assembly(FLA). In the FLA process, nanoparticle chains were fixed at the oil interface through photopolymerization,enabling direct visualization of organized mesostructures using atomic force microscopy. Using the FLAmethodology, we systematically investigated different conditions and demonstrated that dispersedferromagnetic colloids possess sufficient dipolar interactions to organize into mesoscopic assemblies.Application of an external magnetic field during assembly enabled the formation of micron-sized chainswhich were aligned in the direction of the applied field. This universal methodology is an attractive alternativetechnique to cryogenic transmission electron microscopy (cryo-TEM) for the visualization of nanoparticleassembly in dispersed organic media.
m) in a process referred to as Fossilized Liquid Assembly(FLA). In the FLA process, nanoparticle chains were fixed at the oil interface through photopolymerization,enabling direct visualization of organized mesostructures using atomic force microscopy. Using the FLAmethodology, we systematically investigated different conditions and demonstrated that dispersedferromagnetic colloids possess sufficient dipolar interactions to organize into mesoscopic assemblies.Application of an external magnetic field during assembly enabled the formation of micron-sized chainswhich were aligned in the direction of the applied field. This universal methodology is an attractive alternativetechnique to cryogenic transmission electron microscopy (cryo-TEM) for the visualization of nanoparticleassembly in dispersed organic media.