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A. Langer, C. Mayer

NMR-Characterization of Magnetic Fluids

Keywords: NMR, Magnetic Particles, Lateral Diffusion, Ferrofluids, Magnetic Stray Field

³¹P-NMR spectra have been measured on aqueous solutions and gels of phosphorylated polyvinyl alcohol in absence and in presence of dispersed magnetic nanoparticles. In this system, the rotational diffusion is still rapid enough for a sufficient averaging of the CSA tensor of the ³¹P nucleus. At the same time, the lateral diffusion of the ³¹P nuclei is significantly reduced. Under these circumstances, it is possible to detect the spatial distribution of the local field by ³¹P-NMR. The obtained line shape exhibits the characteristic shark fin pattern which has been predicted on a theoretical basis. This basically supports the proposed dependence of the NMR line shape on the velocity of lateral diffusion which allows for detailed analysis of lateral motion.

Zeitschrift für Physikalische Chemie, Oldenbourg Wissenschaftsverlag

Print ISSN: 0942-9352
Volume: 220, 01/2006
Pages: 079 - 087

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