Mesoporous Cobalt Ferrite Nanosystems Obtained by Surfactant-Assisted Hydrothermal Method: Tuning Morpho-structural and Magnetic Properties via pH-Variation

Nanomaterials
Petru PaladeVictor Kuncser

Abstract

A facile and cheap surfactant-assisted hydrothermal method was used to prepare mesoporous cobalt ferrite nanosystems with BET surface area up to 151 m2/g. These mesostructures with high BET surface areas and pore sizes are made from assemblies of nanoparticles (NPs) with average sizes between 7.8 and 9.6 nm depending on the initial pH conditions. The pH proved to be the key factor for controlling not only NP size, but also the phase purity and the porosity properties of the mesostructures. At pH values lower than 7, a parasite hematite phase begins to form. The sample obtained at pH = 7.3 has magnetization at saturation Ms = 38 emu/g at 300 K (54.3 emu/g at 10 K) and BET surface area SBET = 151 m2/g, whereas the one obtained at pH = 8.3 has Ms = 68 emu/g at 300 K (83.6 emu/g at 10 K) and SBET = 101 m2/g. The magnetic coercive field values at 10 K are high at up to 12,780 Oe, with a maximum coercive field reached for the sample obtained at pH = 8.3. Decreased magnetic performances are obtained at pH values higher than 9. The iron occupancies of the tetrahedral and octahedral sites belonging to the cobalt ferrite spinel structure were extracted through decomposition of the Mössbauer patterns in spectral components. The magnetic a...Continue Reading

References

Oct 1, 1996·Physical Review. B, Condensed Matter·J P ChenA Kostikas
Jan 8, 2004·Journal of the American Chemical Society·Shouheng SunGuanxiong Li
Nov 29, 2011·Journal of Physics. Condensed Matter : an Institute of Physics Journal·Mathieu ArtusFernand Fiévet
Nov 10, 2012·Acta Biomaterialia·Noppakun SanpoJames Wang
Mar 29, 2014·Dalton Transactions : an International Journal of Inorganic Chemistry·Michal SedlacikPetr Filip
Sep 28, 2017·Ultrasonics Sonochemistry·Raghvendra Singh YadavMartin Holek

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Methods Mentioned

BETA
thermal decomposition
X-ray
transmission
electron diffraction

Software Mentioned

NORMOS
MAUD

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