Longitudinal Water Proton Relaxivities of Gd(OH)3 Nanorods, Gd(OH)3 Nanoparticles, and Gd2O3 Nanoparticles: Dependence on Particle Diameter, Composition, and Morphology
J. Korean Phy. Soc. 2011; 59: 2376~2380
Published online September 15, 2011 © 2011 The Korean Physical Society.

Abstract

Gd(OH)3 nanorods, Gd(OH)3 nanoparticles, and Gd2O3 nanoparticles were prepared and their longitudinal water proton relaxivities (r1s) were investigated. They are important for application to a highly sensitive T1 MRI contrast agent. The r1s did not much depend on either composition or morphology but on particle diameter such that an optimal particle diameter (¡­1.7 nm) exists for a maximal r1 (~ 15.2 s-1mM-1). This is interpreted such that surface Gd(III) ions mainly contribute to the r1.

Keywords: Longitudinal water proton relaxivity, Gd(OH)3, Gd2O3, Nanorod, Nanoparticle


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