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Temperature dependence on the mass susceptibility and mass magnetization of superparamagnetic Mn-Zn-ferrite nanoparticles as contrast agents for magnetic imaging of oil and gas reservoirs.
- Source :
- Journal of Experimental Nanoscience; Dec2018, Vol. 13 Issue 1, p107-118, 12p
- Publication Year :
- 2018
-
Abstract
- The mass susceptibility (χ<subscript>mass</subscript>) and mass magnetization (M<subscript>mass</subscript>) were determined for a series of ternary manganese and zinc ferrite nanoparticles (Mn-Zn ferrite NPs, Mn<subscript>x</subscript>Zn<subscript>1−</subscript><subscript>x</subscript>Fe<subscript>2</subscript>O<subscript>4</subscript>) with different Mn:Zn ratios (0.08 ≤ x ≤ 4.67), prepared by the thermal decomposition reaction of the appropriate metal acetylacetonate complexes, and for the binary homologs (M<subscript>x</subscript>Fe<subscript>3−x</subscript>O<subscript>4</subscript>, where M = Mn or Zn). Alteration of the Mn:Zn ratio in Mn-Zn ferrite NPs does not significantly affect the particle size. At room temperature and low applied field strength the mass susceptibility increases sharply as the Mn:Zn ratio increases, but above a ratio of 0.4 further increase in the amount of manganese results in the mass susceptibility decreasing slightly, reaching a plateau above Mn:Zn ≈ 2. The compositional dependence of the mass magnetization shows less of a variation at room temperature and high applied fields. The temperature dependence of the mass magnetization of Mn-Zn ferrite NPs is significantly less for Mn-rich compositions making them more suitable for downhole imaging at higher temperatures (>100 °C). For non-shale reservoirs, replacement of nMag by Mn-rich Mn-Zn ferrites will allow for significant signal-to-noise enhancement of 6.5× over NP magnetite. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 17458080
- Volume :
- 13
- Issue :
- 1
- Database :
- Complementary Index
- Journal :
- Journal of Experimental Nanoscience
- Publication Type :
- Academic Journal
- Accession number :
- 133743723
- Full Text :
- https://doi.org/10.1080/17458080.2018.1426894