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
Nummer van het tijdschrift6
StatusGepubliceerd - 13 jun 2018


Citeer dit

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.