Crystallization of nanocrystals in spherical confinement probed by in Situ X-ray scattering

Federico Montanarella, Jaco J. Geuchies, Tonnishtha Dasgupta, P. Tim Prins, Carlo Van Overbeek, Rajeev Dattani, Patrick Baesjou, Marjolein Dijkstra, Andrei V. Petukhov, Alfons Van Blaaderen, Daniel Vanmaekelbergh

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We studied the formation of supraparticles from nanocrystals confined in slowly evaporating oil droplets in an oil-in-water emulsion. The nanocrystals consist of an FeO core, a CoFe2O4 shell, and oleate capping ligands, with an overall diameter of 12.5 nm. We performed in situ small- and wide-angle X-ray scattering experiments during the entire period of solvent evaporation and colloidal crystallization. We observed a slow increase in the volume fraction of nanocrystals inside the oil droplets up to 20%, at which a sudden crystallization occurs. Our computer simulations show that crystallization at such a low volume fraction is only possible if attractive interactions between colloidal nanocrystals are taken into account in the model as well. The spherical supraparticles have a diameter of about 700 nm and consist of a few crystalline face-centered cubic domains. Nanocrystal supraparticles bear importance for magnetic and optoelectronic applications, such as color tunable biolabels, color tunable phosphors in LEDs, and miniaturized lasers.

Originele taal-2Engels
Pagina's (van-tot)3675-3681
Aantal pagina's7
TijdschriftNano Letters
Volume18
Nummer van het tijdschrift6
DOI's
StatusGepubliceerd - 13 jun 2018

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Montanarella, F., Geuchies, J. J., Dasgupta, T., Prins, P. T., Van Overbeek, C., Dattani, R., ... Vanmaekelbergh, D. (2018). Crystallization of nanocrystals in spherical confinement probed by in Situ X-ray scattering. Nano Letters, 18(6), 3675-3681. https://doi.org/10.1021/acs.nanolett.8b00809