期刊
ADVANCED FUNCTIONAL MATERIALS
卷 25, 期 5, 页码 711-719出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.201403585
关键词
biomimetic synthesis; biomineralization; Fe3O4; iron oxides; magnetic nanoparticles
类别
资金
- NanoNextNL, a micro and nanotechnology consortium of the government of The Netherlands
- European Research Council [240394]
- Dutch Science Foundation - Chemical Sciences (NWO-CW)
- European Research Council (ERC) [240394] Funding Source: European Research Council (ERC)
Control over magnetite (Fe3O4) formation is difficult to achieve in synthetic systems without using non-aqueous media and high temperatures. In contrast, Nature employs often intrinsically disordered proteins to tightly tailor the size, shape, purity, and organization of the nanocrystals to optimize their magnetic properties. Inspired by such flexible polyelectrolytes, here random copolypeptides having different amino acid compositions are used as control agents in the bioinspired coprecipitation of magnetite through a ferrihydrite precursor, following a recently developed mineralization protocol. Importantly, the copolypeptide library is designed such that the amino acid composition can be optimized to simultaneously direct the size of the nanoparticles as well as their dispersibility in aqueous media in a one-pot manner. Acidic amino acids are demonstrated to regulate the crystal size by delaying nucleation and reducing growth. Their relative content thus can be balanced to tune between the superparamagnetic and ferrimagnetic regimes, and high contents of negatively charged amino acids result in colloidal stabilization of superparamagnetic nanoparticles at high pH. Conversely, with positively charged lysine-rich copolypeptides ferrimagnetic crystals are obtained which are stabilized at neutral pH and self-organize in chains, as visualized by cryo-transmission electron microscopy. Altogether, the presented findings give important insights for the future development of additive-mediated nanomaterial syntheses.
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