| Autor: |
Benkoski JJ; Polymers Division, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, USA., Bowles SE, Korth BD, Jones RL, Douglas JF, Karim A, Pyun J |
| Jazyk: |
angličtina |
| Zdroj: |
Journal of the American Chemical Society [J Am Chem Soc] 2007 May 16; Vol. 129 (19), pp. 6291-7. Date of Electronic Publication: 2007 Apr 20. |
| DOI: |
10.1021/ja070779d |
| Abstrakt: |
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 a crosslinkable oil-water interface under both magnetic field induced and zero-field conditions and permanently fixed into 1-D mesoscopic polymer chains (1-9 mum) 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 FLA methodology, we systematically investigated different conditions and demonstrated that dispersed ferromagnetic colloids possess sufficient dipolar interactions to organize into mesoscopic assemblies. Application of an external magnetic field during assembly enabled the formation of micron-sized chains which were aligned in the direction of the applied field. This universal methodology is an attractive alternative technique to cryogenic transmission electron microscopy (cryo-TEM) for the visualization of nanoparticle assembly in dispersed organic media. |
| Databáze: |
MEDLINE |
| Externí odkaz: |
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