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Combined experimental and theoretical approach to the kinetics of magnetite crystal growth from primary particles

MPS-Authors
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Widdrat,  Marc
Damien Faivre, Biomaterialien, Max Planck Institute of Colloids and Interfaces, Max Planck Society;

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Schneck,  Emanuel
Emanuel Schneck, Biomaterialien, Max Planck Institute of Colloids and Interfaces, Max Planck Society;

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Reichel,  Victoria
Damien Faivre, Biomaterialien, Max Planck Institute of Colloids and Interfaces, Max Planck Society;

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Baumgartner,  Jens
Damien Faivre, Biomaterialien, Max Planck Institute of Colloids and Interfaces, Max Planck Society;

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Bertinetti,  Luca
Luca Bertinetti (Indep. Res.), Biomaterialien, Max Planck Institute of Colloids and Interfaces, Max Planck Society;

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Habraken,  Wouter
Wouter Habraken (Indep. Res.), Biomaterialien, Max Planck Institute of Colloids and Interfaces, Max Planck Society;

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Bente,  Klaas
Damien Faivre, Biomaterialien, Max Planck Institute of Colloids and Interfaces, Max Planck Society;

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Fratzl,  Peter
Peter Fratzl, Biomaterialien, Max Planck Institute of Colloids and Interfaces, Max Planck Society;

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Faivre,  Damien
Damien Faivre, Biomaterialien, Max Planck Institute of Colloids and Interfaces, Max Planck Society;

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Fulltext (public)

2407333.pdf
(Publisher version), 2MB

Supplementary Material (public)

2407333_si.pdf
(Supplementary material), 667KB

Citation

Widdrat, M., Schneck, E., Reichel, V., Baumgartner, J., Bertinetti, L., Habraken, W., et al. (2017). Combined experimental and theoretical approach to the kinetics of magnetite crystal growth from primary particles. The Journal of Physical Chemistry Letters, 8(6), 1132-1136. doi:10.1021/acs.jpclett.6b02977.


Cite as: http://hdl.handle.net/11858/00-001M-0000-002D-2EA1-7
Abstract
It is now recognized that nucleation and growth of crystals can occur not only by the addition of solvated ions but also by accretion of nanoparticles, in a process called nonclassical crystallization. The theoretical framework of such processes has only started to be described, partly due to the lack of kinetic or thermodynamic data. Here, we study the growth of magnetite nanoparticles from primary particles—nanometer-sized amorphous iron-rich precursors—in aqueous solution at different temperatures. We propose a theoretical framework to describe the growth of the nanoparticles and model both a diffusion-limited and a reaction-limited pathway to determine which of these best describes the rate-limiting step of the process. We show that, based on the measured iron concentration and the related calculated concentration of primary particles at the steady state, magnetite growth is likely a reaction-limited process, and within the framework of our model, we propose a phase diagram to summarize the observations.