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Magnetic properties and heating efficacy of magnesium doped magnetite nanoparticles obtained by co-precipitation method
- Source :
- Journal of Magnetism and Magnetic Materials
- Publication Year :
- 2019
- Publisher :
- Elsevier BV, 2019.
-
Abstract
- Ferrofluids based on magnesium substituted magnetite nanoparticles MgxFe3−xO4 (x = 0.1; 0.2; 0.4) were synthesised by a chemical co-precipitation method. Their physical properties have been compared with those of the magnetite based ferrofluid obtained by the same synthesis route. Both XRD and TEM studies showed particle size decrease with the increased Mg content while DLS experiments pointed to the more prominent aggregation of Mg-containing nanoparticles. Magnetic properties investigation conducted on the powder (i.e. dried) specimens showed decrease of magnetization values with increased Mg content except for the lowest concentration of x = 0.1 where substantial saturation magnetization rise of about 40% was recorded at room temperature. Heating abilities of the studied ferrofluids under the applied AC fields (SAR values) also showed decreasing trend with the increased Mg content even for x = 0.1 sample despite its elevated magnetization value. This trend has been understood as a consequence of the changed intrinsic nanoparticle properties such as size and magnetic anisotropy, as well as contribution of a collective behaviour due to an increased nanoparticle aggregation in Mg-doped systems.
- Subjects :
- Ferrofluid
Materials science
Analytical chemistry
Nanoparticle
chemistry.chemical_element
02 engineering and technology
01 natural sciences
Magnetization
chemistry.chemical_compound
Magnetic properties
0103 physical sciences
Magnetic hyperthermia
Magnetite
010302 applied physics
Oxide materials
Magnesium
Nanostructured materials
021001 nanoscience & nanotechnology
Condensed Matter Physics
Electronic, Optical and Magnetic Materials
Magnetic anisotropy
Ferrofluids
chemistry
Particle size
0210 nano-technology
human activities
Subjects
Details
- ISSN :
- 03048853
- Volume :
- 475
- Database :
- OpenAIRE
- Journal :
- Journal of Magnetism and Magnetic Materials
- Accession number :
- edsair.doi.dedup.....f454dc132d455e42f183b13691e7f7e9