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Instruments / Technical Area	Publication Details	Published	Actions
I20-Scanning-X-ray spectroscopy (XAS/XES)	Wettability of magnetite nanoparticles guides growth from stabilized amorphous ferrihydrite Lucas Kuhrts , Sylvain Prévost , Daniel M. Chevrier , Péter Pekker , Oliver Spaeker , Mathias Egglseder , Jens Baumgartner , Mihály Pósfai , Damien Faivre Journal Of The American Chemical Society DOI: 10.1021/jacs.1c02687 Diamond Proposal Number(s): [21532] Open Access Show Abstract ▼ Abstract: Crystal formation via amorphous precursors is a long-sought-after gateway to engineer nanoparticles with well-controlled size and morphology. Biomineralizing organisms, like magnetotactic bacteria, follow such a nonclassical crystallization pathway to produce magnetite nanoparticles with sophistication unmatched by synthetic efforts at ambient conditions. Here, using in situ small-angle X-ray scattering, we demonstrate how the addition of poly(arginine) in the synthetic formation of magnetite nanoparticles induces a biomineralization-reminiscent pathway. The addition of poly(arginine) stabilizes an amorphous ferrihydrite precursor, shifting the magnetite formation pathway from thermodynamic to kinetic control. Altering the energetic landscape of magnetite formation by catalyzing the pH-dependent precursor attachment, we tune magnetite nanoparticle size continuously, exceeding sizes observed in magnetotactic bacteria. This mechanistic shift we uncover here further allows for crystal morphology control by adjusting the pH-dependent interfacial interaction between liquidlike ferrihydrite and nascent magnetite nanoparticles, establishing a new strategy to control nanoparticle morphology. Synthesizing compact single crystals at wetting conditions and unique semicontinuous single-crystalline nanoparticles at dewetting conditions in combination with an improved control over magnetite crystallite size, we demonstrate the versatility of bio-inspired, kinetically controlled nanoparticle formation pathways.	Jul 2021

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I20-Scanning-X-ray spectroscopy (XAS/XES)

Wettability of magnetite nanoparticles guides growth from stabilized amorphous ferrihydrite

Lucas Kuhrts , Sylvain Prévost , Daniel M. Chevrier , Péter Pekker , Oliver Spaeker , Mathias Egglseder , Jens Baumgartner , Mihály Pósfai , Damien Faivre

Journal Of The American Chemical Society

DOI: 10.1021/jacs.1c02687

Diamond Proposal Number(s): [21532]