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Article

Characterization of Magnetite–Silica Magnetic Fluids by Laser Scattering

1
Institute of Physics, Nanotechnology and Telecommunications, Peter the Great St. Petersburg Polytechnic University, 195251 Saint Petersburg, Russia
2
Department of Micro and Nanoelectronics, Saint Petersburg Electrotechnical University “LETI”, 197376 Saint Petersburg, Russia
3
Institute for Optoelectronics and Microtechnologies (ISOM), Universidad Politécnica de Madrid, 28040 Madrid, Spain
*
Authors to whom correspondence should be addressed.
Appl. Sci. 2021, 11(1), 183; https://doi.org/10.3390/app11010183
Received: 28 November 2020 / Revised: 19 December 2020 / Accepted: 24 December 2020 / Published: 27 December 2020
(This article belongs to the Special Issue Nanocomposite Materials: Synthesis, Properties and Applications)
The paper is concerned with structural, morphological and magnetic properties of magnetite-silica magnetic fluids. The granulometric composition of the magnetic fluids was investigated by scanning and transmission electron microscopy, the phase composition was studied by X-ray diffraction and reflection high-energy electron diffraction, and magnetic properties were studied by vibrating sample magnetometry. In order to reveal the particle size distribution, dynamic light scattering and a proposed modification of depolarized dynamic light scattering were employed. The shape and dimensions of magnetic nanoparticles and also their aggregates are described. While the aspect ratio for the aggregates was 0.5–0.99, individual nanoparticles had an average aspect ratio of 0.9 and were nearly spherical. The sedimentation stability of a diluted magnetic fluid was also investigated. When the fluids were diluted 200 times, the stability was partially lost, and the nanoparticles aggregated, thereby forming clusters, and precipitated. View Full-Text
Keywords: magnetic fluid; sedimentation stability; sizes of nanoparticles; dynamic light scattering; depolarized light scattering; magnetometry; reflection high-energy electron diffraction magnetic fluid; sedimentation stability; sizes of nanoparticles; dynamic light scattering; depolarized light scattering; magnetometry; reflection high-energy electron diffraction
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MDPI and ACS Style

Velichko, E.N.; Nepomnyashchaya, E.K.; Gareev, K.G.; Martínez, J.; Maicas, M.C. Characterization of Magnetite–Silica Magnetic Fluids by Laser Scattering. Appl. Sci. 2021, 11, 183. https://doi.org/10.3390/app11010183

AMA Style

Velichko EN, Nepomnyashchaya EK, Gareev KG, Martínez J, Maicas MC. Characterization of Magnetite–Silica Magnetic Fluids by Laser Scattering. Applied Sciences. 2021; 11(1):183. https://doi.org/10.3390/app11010183

Chicago/Turabian Style

Velichko, Elena N., Elina K. Nepomnyashchaya, Kamil G. Gareev, Javier Martínez, and Marco C. Maicas 2021. "Characterization of Magnetite–Silica Magnetic Fluids by Laser Scattering" Applied Sciences 11, no. 1: 183. https://doi.org/10.3390/app11010183

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