NMR Relaxation Efficiency of Aqueous Solutions of Composite Mg x Zn y Fe3−x−y O4 Nanoparticles
| Autor: | Tatsiana G. Shutava, V. A. Sabitova, A. V. Nikitina, A. A. Kostina, E. Petrova, Kanstantsin S. Livanovich, D. Kotsikau, V.O. Natarov, Vladimir Pankov, Yu. V. Bogachev |
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| Rok vydání: | 2017 |
| Předmět: |
Aqueous solution
Chemistry Relaxation (NMR) Analytical chemistry Nanoparticle 02 engineering and technology 021001 nanoscience & nanotechnology Atomic and Molecular Physics and Optics Polyelectrolyte 030218 nuclear medicine & medical imaging 03 medical and health sciences chemistry.chemical_compound 0302 clinical medicine Adsorption Proton NMR Magnetic nanoparticles 0210 nano-technology Magnetite |
| Zdroj: | Applied Magnetic Resonance. 48:715-722 |
| ISSN: | 1613-7507 0937-9347 |
| Popis: | The results of proton nuclear magnetic resonance (NMR) relaxation measurements in aqueous solutions of Mg x Zn y Fe3−x−y O4 magnetite-based composite magnetic nanoparticles (MNPs) are discussed. It is shown that their transverse relaxivity (relaxation efficiency) r 2 is significantly higher than the longitudinal relaxivity r 1 and depends on the magnetic nanoparticles composition and preparation method. A polyelectrolyte layer adsorbed on the nanoparticle surface increases both relaxivity values. The carbonate-synthesized MNPs possess higher values of r 2 and r 1 as compared with base-precipitated complex oxides. Relaxivity r 2 is shown to be affected by stability of MNPs in aqueous solutions and the aggregation behavior apparently can be assessed through the NMR relaxation measurements. |
| Databáze: | OpenAIRE |
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