L X-Rays RYIED Oscillations and Proton-NMRD of Gd2O3 Nanoparticles. (19th May 2011)

• Record Type: Journal Article
• Authors: Taborda, A.; Reis, M. A.; Chaves, P. C.; Carvalho, A.
• Other Names: Mirov Sergey B. Academic Editor.
• Is Part Of: Physics research international. Volume 2011(2011)
• Publication Date: 2011-05-19
• Subjects: Physics -- Periodicals; Physics; Periodicals; Electronic journals; 530
• DOI: 10.1155/2011/705686
• Languages: English
• ISSNs: 2090-2220

Abstract

Abstract : Recently, it was shown that relative yields of X-rays induced by ion impact are not constant but depend on beam energy. In the framework of this problem, pellets of Gd2 O3 and a Gd chelate, Gd-DOTA, as well as a 5 nm in diameter Gd2 O3 nanoparticles dispersion on a polycarbonate Nuclepore filter, were studied. In this work, it is shown that after subtraction of known matrix effects, relative yield variations still present different patterns for Gd2 O3 pellet and Gd2 O3 nanoparticles. Proton NMRDT 1 ( ω ) data for Gd2 O3 nanoparticles and Gd-DOTA water solutions published by Bridot et al. and Toth et al., respectively, were reproduced using a model for paramagnetic substances in water solutions and identical electronic relaxation times. The analysis of both techniques results points collective electron behaviour as the explanation for the different observations on X-ray data of Gd2 O3 nanoparticles and bulk material.