PMID: 11902889Mar 21, 2002Paper

Solution synthesis of gadolinium nanoparticles

Journal of the American Chemical Society
Jennifer A NelsonMichael J Wagner

Abstract

Gadolinium nanoparticles have been produced at subambient temperature by alkalide reduction. The nanoparticles display maxima in the temperature dependence of their magnetization, cooled in the absence of an applied external field, at T(max) of 5.0 and 17.5 K for unheated samples and samples annealed at 1000 degrees C for 4 h, respectively. Field cooled behavior deviates at temperatures slightly above T(max), increasing at lower temperature. Curie-Weiss law fits of the high-temperature data yield magnetic moments in close agreement with those expected for noninteracting Gd(3+) ions, suggesting that the behavior seen is due to a magnetic transition rather than superparamagnetism. Magnetization is linearly dependent on field at temperatures higher than 7-8 times T(max) and shows remanence-free hysteresis at lower temperature, suggesting metamagnetism. Some annealed samples show evidence of additional ferromagnetic interactions below approximately 170 K. Magnetic entropy curves generated from magnetization data are consistent with that expected for a paramagnet.

Citations

May 13, 2009·Journal of the American Chemical Society·Changzheng WuYi Xie
May 3, 2013·Nano Letters·Chao Yan, Michael J Wagner
Jan 20, 2007·Journal of Controlled Release : Official Journal of the Controlled Release Society·Hila EpsteinGershon Golomb
Mar 24, 2006·Academic Radiology·Michael Alexander McDonald, Kenneth L Watkin
Oct 17, 2018·Physical Chemistry Chemical Physics : PCCP·Stephen G DaleErin R Johnson
Jul 18, 2018·Beilstein Journal of Nanotechnology·Marvin SiebelsChristoph Janiak
Jul 5, 2018·Journal of Cardiovascular Electrophysiology·Moshe Rav Acha, Ben W Corn
May 1, 2021·Angewandte Chemie·Daniel BartenbachClaus Feldmann
Jan 9, 2003·Journal of the American Chemical Society·Jennifer A Nelson, Michael J Wagner

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