Publisher DOI: 10.1038/nmat4553
Title: Organically linked iron oxide nanoparticle supercrystals with exceptional isotropic mechanical properties
Language: English
Authors: Dreyer, Axel 
Feld, Artur 
Kornowski, Andreas 
Yilmaz, Ezgi D. 
Noei, Heshmat 
Meyer, Andreas 
Krekeler, Tobias 
Jiao, Chengge 
Stierle, Andreas 
Abetz, Volker 
Weller, Horst 
Schneider, Gerold A. 
Issue Date: 1-May-2016
Source: Nature Materials 5 (15): 522-528 (2016-05-01)
Abstract (english): 
It is commonly accepted that the combination of the anisotropic shape and nanoscale dimensions of the mineral constituents of natural biological composites underlies their superior mechanical properties when compared to those of their rather weak mineral and organic constituents. Here, we show that the self-assembly of nearly spherical iron oxide nanoparticles in supercrystals linked together by a thermally induced crosslinking reaction of oleic acid molecules leads to a nanocomposite with exceptional bending modulus of 114 GPa, hardness of up to 4 GPa and strength of up to 630 MPa. By using a nanomechanical model, we determined that these exceptional mechanical properties are dominated by the covalent backbone of the linked organic molecules. Because oleic acid has been broadly used as nanoparticle ligand, our crosslinking approach should be applicable to a large variety of nanoparticle systems.
URI: http://hdl.handle.net/11420/5717
ISSN: 1476-1122
Journal: Nature materials 
Institute: Keramische Hochleistungswerkstoffe M-9 
Document Type: Article
Project: SFB 986: Teilprojekt A6 - Herstellung und Charakterisierung hierarchischer, multi-funktionaler Keramik/Metall-Polymer Materialsysteme 
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