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Tuning the structure and habit of iron oxide mesocrystals
Stockholm University, Faculty of Science, Department of Materials and Environmental Chemistry (MMK). Uppsala University, Sweden.
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Number of Authors: 9
2016 (English)In: Nanoscale, ISSN 2040-3364, E-ISSN 2040-3372, Vol. 8, no 34, 15571-15580 p.Article in journal (Refereed) Published
Abstract [en]

A precise control over the meso-and microstructure of ordered and aligned nanoparticle assemblies, i.e., mesocrystals, is essential in the quest for exploiting the collective material properties for potential applications. In this work, we produced evaporation-induced self-assembled mesocrystals with different mesostructures and crystal habits based on iron oxide nanocubes by varying the nanocube size and shape and by applying magnetic fields. A full 3D characterization of the mesocrystals was performed using image analysis, high-resolution scanning electron microscopy and Grazing Incidence Small Angle X-ray Scattering (GISAXS). This enabled the structural determination of e.g. multi-domain mesocrystals with complex crystal habits and the quantification of interparticle distances with sub-nm precision. Mesocrystals of small nanocubes (l = 8.6-12.6 nm) are isostructural with a body centred tetragonal (bct) lattice whereas assemblies of the largest nanocubes in this study (l = 13.6 nm) additionally form a simple cubic (sc) lattice. The mesocrystal habit can be tuned from a square, hexagonal to star-like and pillar shapes depending on the particle size and shape and the strength of the applied magnetic field. Finally, we outline a qualitative phase diagram of the evaporation-induced self-assembled superparamagnetic iron oxide nanocube mesocrystals based on nanocube edge length and magnetic field strength.

Place, publisher, year, edition, pages
2016. Vol. 8, no 34, 15571-15580 p.
National Category
Chemical Sciences Nano Technology Materials Engineering Physical Sciences
URN: urn:nbn:se:su:diva-134193DOI: 10.1039/c6nr03776cISI: 000382053300017PubMedID: 27448065OAI: diva2:1040477
Available from: 2016-10-27 Created: 2016-10-03 Last updated: 2016-10-27Bibliographically approved

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Bergström, Lennart
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