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Wettability of magnetite nanoparticles guides growth from stabilized amorphous ferrihydrite

DOI: 10.1021/jacs.1c02687 DOI Help

Authors: Lucas Kuhrts (Max Planck Institute of Colloids and Interfaces) , Sylvain Prévost (nstitut Laue-Langevin) , Daniel M. Chevrier (Max Planck Institute of Colloids and Interfaces; CNRS, CEA, BIAM, Aix-Marseille University) , Péter Pekker (University of Pannonia) , Oliver Spaeker (Max Planck Institute of Colloids and Interfaces) , Mathias Egglseder (Max Planck Institute of Colloids and Interfaces) , Jens Baumgartner (Max Planck Institute of Colloids and Interfaces) , Mihály Pósfai (University of Pannonia) , Damien Faivre (Max Planck Institute of Colloids and Interfaces; CNRS, CEA, BIAM, Aix-Marseille University)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Journal Of The American Chemical Society

State: Published (Approved)
Published: July 2021
Diamond Proposal Number(s): 21532

Open Access Open Access

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.

Journal Keywords: Morphology; Magnetite; Crystallization; Precursors; Nanoparticles

Subject Areas: Chemistry, Materials

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

Other Facilities: ID02 at ESRF

Added On: 17/07/2021 21:53


Discipline Tags:

Chemistry Materials Science Inorganic Chemistry Nanoscience/Nanotechnology

Technical Tags:

Spectroscopy X-ray Absorption Spectroscopy (XAS) Extended X-ray Absorption Fine Structure (EXAFS) X-ray Absorption Near Edge Structure (XANES)