DOI: 10.1063/1.478435. Theory of proton relaxation induced by superparamagnetic particles

Theory of proton relaxation induced by superparamagnetic particles

10.1063/1.478435

Crossref journal-article

AIP Publishing

The Journal of Chemical Physics (317)

Abstract

Evaluating and understanding the performances of magnetic colloids as contrast agents for MRI requires a theory describing their magnetic interactions with water protons. The field dependence of the proton longitudinal relaxation rate (nuclear magnetic relaxation dispersion profiles) in aqueous colloidal suspensions of superparamagnetic particles is based on the so-called Curie relaxation, which essentially accounts for the high field part of the NMRD profiles (B0&gt;0.02 T). The low-field part of the NMRD profiles can only be explained by the crystal’s internal anisotropy energy, a concept which clarifies the important difference between superpara- and paramagnetic compounds: the anisotropy energy modifies both the electronic precession frequencies and the thermodynamic probability of occupation of the crystal magnetic states. Our theory clearly explains why a low-field dispersion exists for suspensions of small size crystals, and why it does not for large crystals’ suspensions. This important effect is due to the Boltzmann factors depending on the anisotropy energy, which is itself proportional to the particle volume.

Bibliography

Roch, A., Muller, R. N., & Gillis, P. (1999). Theory of proton relaxation induced by superparamagnetic particles. The Journal of Chemical Physics, 110(11), 5403â5411.

Authors 3

Alain Roch (first)
Robert N. Muller (additional)
Pierre Gillis (additional)

References 24 Referenced 372

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Dates

Type	When
Created	23 years, 1 month ago (July 26, 2002, 8:17 a.m.)
Deposited	1 year, 6 months ago (Feb. 11, 2024, 6:32 a.m.)
Indexed	3 weeks ago (Aug. 6, 2025, 7:59 a.m.)
Issued	26 years, 5 months ago (March 15, 1999)
Published	26 years, 5 months ago (March 15, 1999)
Published Print	26 years, 5 months ago (March 15, 1999)

Funders 0

None

BibTeX

@article{Roch_1999, title={Theory of proton relaxation induced by superparamagnetic particles}, volume={110}, ISSN={1089-7690}, url={http://dx.doi.org/10.1063/1.478435}, DOI={10.1063/1.478435}, number={11}, journal={The Journal of Chemical Physics}, publisher={AIP Publishing}, author={Roch, Alain and Muller, Robert N. and Gillis, Pierre}, year={1999}, month=mar, pages={5403–5411} }

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