Superparamagnetic colloid suspensions: Water magnetic relaxation and clustering

被引：231

作者：

Roch, A

Gossuin, Y

Muller, RN

Gillis, P

机构：

[1] Univ Mons, Biol Phys Dept, B-7000 Mons, Belgium

[2] Univ Mons, Dept Organ Chem, B-7000 Mons, Belgium

[3] Univ Mons, NMR Lab, B-7000 Mons, Belgium

来源：

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS | 2005年 / 293卷 / 01期

关键词：

MRI contrast agents; nuclear magnetic relaxation dispersion; clustering; aggregation; diffusion; nanoparticles; T1; shortening; magnetite; SPIO; USPIO;

D O I：

10.1016/j.jmmm.2005.01.070

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Ferrite superparamagnetic (SPM) nanoparticles in aqueous suspensions shorten the nuclear magnetic relaxation of water protons. For transverse relaxation, that effect is enhanced when agglomeration of elementary SPM cores occurs, because of an increase of the secular part of the transverse relaxivity. On the contrary, clustering weakens the T1-shortening, in agreement with the prediction of a new model for diffusion. (c) 2005 Elsevier B.V. All rights reserved.

引用

页码：532 / 539

页数：8

共 16 条

[1] CALCULATION OF SPECTRAL DENSITIES FOR RELAXATION RESULTING FROM RANDOM MOLECULAR TRANSLATIONAL MODULATION OF MAGNETIC DIPOLAR COUPLING IN LIQUIDS [J].