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Magnetic properties of the MRI enhancement agent Feridex from Mössbauer spectra.
- Source :
-
Hyperfine Interactions . 10/21/2021, Vol. 242 Issue 1, p1-5. 5p. - Publication Year :
- 2021
-
Abstract
- Mössbauer spectra of Feridex, an MRI enhancement agent, show that it contains superparamagnetic γ-Fe2O3 nanoparticles. From spectra in magnetic fields applied at room temperature the magnetic moment of the particles was measured to be 11,250 μB, from which the diameters of the single-domain particles are estimated to be about 8 nm. This is smaller than the hydrodynamic particle size of 30 nm which includes a protective coating of dextran. The particles are monodisperse, as shown by the continuous change from a broad superparamagnetic line to a magnetic 6-line pattern as the temperature is lowered below the blocking temperature TB of about 90 K. The magnetic moments and blocking temperature are consistent with those of γ-Fe2O3 samples of known sizes. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 03043843
- Volume :
- 242
- Issue :
- 1
- Database :
- Academic Search Index
- Journal :
- Hyperfine Interactions
- Publication Type :
- Academic Journal
- Accession number :
- 153159290
- Full Text :
- https://doi.org/10.1007/s10751-021-01739-1