Synthesis and Characterization of Gadolinium colloids in 2-methoxyethanol
|Galo Cardenas 1, Guillermo Contreras 2, Olivia Godoy 1|
1. University of Concepcion, Department of polymers, Chile, Chile
Gadolinium nanometric colloids were obtained in 2-methoxyethanol by CLD method. The colloids exhibit a low stability at room temperature. The UV spectrum show two bands at 227 and 278 nm, which are stable for several days. The solvent exhibit a band at 205 nm. The colloid concentration is approximate 6.45 x10-4 M.
The TEM studies reveal a wide average of particles size ranging from 20 to 30 nm. The particles look spherical and the electron diffraction shows the presence of Gd and Gd2O3. The EDX analysis gives the presence of Gd metal in the colloid. The colloidal particles exhibits a negative charge.
After solvent evaporation active white powders were obtained. The FTIR of the solid shows bands at 2183 cm-1 (ν CO), 1728 cm-1 (ν C=O), 1623 cm-1 (ν C=C) and 891 cm-1 (ν CH2). The ν OCH3 at 1260 cm-1 shows the presence of residual 2-methoxyethanol. The FAR-IR exhibit a very broad band at 384 cm-1 most likely due to metal-metal stretching mode.
The thermogravimetric studies reveal a first thermal decomposition at 105 ºC (water) and a second weight loss at 549 ºC (47%).
Presentation: poster at E-MRS Fall Meeting 2005, Symposium B, by Galo Cardenas
See On-line Journal of E-MRS Fall Meeting 2005
Submitted: 2005-05-11 21:00 Revised: 2009-06-07 00:44