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Rapid Microwave-Assisted Synthesis of Pvp-Coated Ultrasmall Gadolinium Oxide Nanoparticles for Magnetic Resonance Imaging Publisher



Vahdatkhah P1 ; Madaah Hosseini HR1 ; Khodaei A1 ; Montazerabadi AR3 ; Irajirad R2 ; Oghabian MA2, 3 ; Delavari H H4
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Source: Chemical Physics Published:2015


Abstract

Synthesis of polyvinyl pyrrolidone (PVP) coated ultrasmall Gd2O3 nanoparticles (NPs) with enhanced T1-weighted signal intensity and r2/r1 ratio close to unity is performed by a microwave-assisted polyol process. PVP coated Gd2O3NPs with spherical shape and uniform size of 2.5 ± 0.5 nm have been synthesized below 5 min and structure and morphology confirmed by HRTEM, XRD and FTIR. The longitudinal (r1) and transversal relaxation (r2) of Gd2O3NPs is measured by a 3 T MRI scanner. The results showed considerable increasing of relaxivity for Gd2O3NPs in comparison to gadolinium chelates which are commonly used for clinical magnetic resonance imaging. In addition, a mechanism for Gd2O3NPs formation and in situ surface modification of PVP-grafted Gd2O3NPs is proposed. © 2015 Elsevier B.V. All rights reserved.