Dynamics of Superparamagnetic Iron Oxide Nanoparticles with Various Polymeric Coatings

Autor: Czesław Kapusta, D. Rybicki, Janusz Przewoźnik, Kamil Goc, Weronika Mazur, Maria Nowakowska, Sylwia Fiejdasz, Szczepan Zapotoczny, Tomasz Strączek, Stanisław Rumian
Jazyk: angličtina
Rok vydání: 2019
Předmět:
Materials science
Nanoparticle
Maghemite
02 engineering and technology
macromolecular substances
engineering.material
010402 general chemistry
superparamagnetism
01 natural sciences
lcsh:Technology
Article
chemistry.chemical_compound
magnetic dynamics
Dynamic light scattering
Scanning transmission electron microscopy
General Materials Science
lcsh:Microscopy
lcsh:QC120-168.85
polymer coatings
lcsh:QH201-278.5
Mössbauer spectroscopy
lcsh:T
technology
industry
and agriculture
iron oxide nanoparticles
alternating current magnetic susceptometry (ACMS)
021001 nanoscience & nanotechnology
equipment and supplies
Magnetic susceptibility
0104 chemical sciences
chemistry
Chemical engineering
lcsh:TA1-2040
engineering
lcsh:Descriptive and experimental mechanics
lcsh:Electrical engineering. Electronics. Nuclear engineering
0210 nano-technology
lcsh:Engineering (General). Civil engineering (General)
human activities
lcsh:TK1-9971
Excitation
Iron oxide nanoparticles
Superparamagnetism
Zdroj: Materials, Vol 12, Iss 11, p 1793 (2019)
Materials
Volume 12
Issue 11
ISSN: 1996-1944
Popis: In this article, the results of a study of the magnetic dynamics of superparamagnetic iron oxide nanoparticles (SPIONs) with chitosan and polyethylene glycol (PEG) coatings are reported. The materials were prepared by the co-precipitation method and characterized by X-ray diffraction, dynamic light scattering and scanning transmission electron microscopy. It was shown that the cores contain maghemite, and their hydrodynamic diameters vary from 49 nm for PEG-coated to 200 nm for chitosan-coated particles. The magnetic dynamics of the nanoparticles in terms of the function of temperature was studied with magnetic susceptometry and Mö
ssbauer spectroscopy. Their superparamagnetic fluctuations frequencies, determined from the fits of Mö
ssbauer spectra, range from tens to hundreds of megahertz at room temperature and mostly decrease in the applied magnetic field. For water suspensions of nanoparticles, maxima are observed in the absorption part of magnetic susceptibility and they shift to higher temperatures with increasing excitation frequency. A step-like decrease of the susceptibility occurs at freezing, and from that, the Brown&rsquo
s and Né
el&rsquo
s contributions are extracted and compared for nanoparticles differing in core sizes and types of coating. The results are analyzed and discussed with respect to the tailoring of the dynamic properties of these nanoparticle materials for requirements related to the characteristic frequency ranges of MRI and electromagnetic field hyperthermia.
Databáze: OpenAIRE
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