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Open AccessArticle

Fabrication of Maghemite Nanoparticles with High Surface Area

Department of Materials and Environmental Chemistry, Arrhenius Laboratory, Stockholm University, SE-10691 Stockholm, Sweden
Author to whom correspondence should be addressed.
Nanomaterials 2019, 9(7), 1004;
Received: 5 June 2019 / Revised: 29 June 2019 / Accepted: 3 July 2019 / Published: 12 July 2019
Maghemite nanoparticles with high surface area were obtained from the dehydroxylation of lepidocrocite prismatic nanoparticles. The synthesis pathway from the precursor to the porous maghemite nanoparticles is inexpensive, simple and gives high surface area values for both lepidocrocite and maghemite. The obtained maghemite nanoparticles contained intraparticle and interparticle pores with a surface area ca. 30 × 103 m2/mol, with pore volumes in the order of 70 cm3/mol. Both the surface area and pore volume depended on the heating rate and annealing temperature, with the highest value near the transformation temperature (180–250 °C). Following the transformation, in situ X-ray diffraction (XRD) allowed us to observe the temporal decoupling of the decomposition of lepidocrocite and the growth of maghemite. The combination of high-angle annular dark-field imaging using scanning transmission electron microscopy (HAADF-STEM) and surface adsorption isotherms is a powerful approach for the characterization of nanomaterials with high surface area and porosity. View Full-Text
Keywords: porous materials; iron oxide; nanostructures; transformation; characterization porous materials; iron oxide; nanostructures; transformation; characterization
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MDPI and ACS Style

Trushkina, Y.; Tai, C.-W.; Salazar-Alvarez, G. Fabrication of Maghemite Nanoparticles with High Surface Area. Nanomaterials 2019, 9, 1004.

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