Next Article in Journal
Achieving Secondary Dispersion of Modified Nanoparticles by Hot-Stretching to Enhance Dielectric and Mechanical Properties of Polyarylene Ether Nitrile Composites
Previous Article in Journal
Conformational Effects of Pt-Shells on Nanostructures and Corresponding Oxygen Reduction Reaction Activity of Au-Cluster-Decorated NiOx@Pt Nanocatalysts
Previous Article in Special Issue
A Flexible and Highly Sensitive Pressure Sensor Based on AgNWs/NRLF for Hand Motion Monitoring
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; https://doi.org/10.3390/nano9071004
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
Show Figures

Graphical abstract

MDPI and ACS Style

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

Show more citation formats Show less citations formats
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map

1
Back to TopTop