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Wrap-bake-peel process for nanostructural transformation from Β-FeOOH nanorods to biocompatible iron oxide nanocapsules

Cited 394 time in Web of Science Cited 412 time in Scopus
Authors

Piao, Yuanzhe; Kim, Jaeyun; Na, Hyon Bin; Kim, Dokyoon; Baek, Ji Seon; Ko, Mi Kyeong; Lee, Jung Hee; Shokouhimehr, Mohammadreza; Hyeon, Taeghwan

Issue Date
2008-03
Publisher
Nature Publishing Group
Citation
Nature Materials, Vol.7 No.3, pp.242-247
Abstract
The thermal treatment of nanostructured materials to improve their properties generally results in undesirable aggregation and sintering. Here, we report on a novel wrap-bake-peel process, which involves silica coating, heat treatment and finally the removal of the silica layer, to transform the phases and structures of nanostructured materials while preserving theirnanostructural characteristics. We demonstrate, as a proof-of-concept, the fabrication of water-dispersible and biocompatible hollow iron oxide nanocapsules by applying this wrap-bake-peel process to spindle-shaped akagenite (beta-FeOOH) nanoparticles. Depending on the heat treatment conditions, hollow nanocapsules of either haematite or magnetite were produced. The synthesized water-dispersible magnetite nanocapsules were successfully used not only as a drug-delivery vehicle, but also as a T-2 magnetic resonance imaging contrast agent. The current process is generally applicable, and was used to transform heterostructured FePt nanoparticles to high-temperature face-centred-tetragonal-phase FePt alloy nanocrystals.
ISSN
1476-1122
URI
https://hdl.handle.net/10371/165866
DOI
https://doi.org/10.1038/nmat2118
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Graduate School of Convergence Science and Technology (융합과학기술대학원)Dept. of Applied Bioengineering (응용바이오공학과)Journal Papers (저널논문_응용바이오공학과)
College of Engineering/Engineering Practice School (공과대학/대학원)Dept. of Chemical and Biological Engineering (화학생물공학부)Journal Papers (저널논문_화학생물공학부)
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