SciELO - Scientific Electronic Library Online

 
vol.54 issue1CHITOSAN METAL COMPLEXES AND CHITOSAN- Cu ESR STUDIESRELEVANCE OF SECONDARY PROCESSES IN ORAC VALUES OBTAINED EMPLOYING PYROGALLOL RED AS TARGET MOLECULE author indexsubject indexarticles search
Home Pagealphabetic serial listing  

Services on Demand

Journal

Article

Indicators

Related links

Share


Journal of the Chilean Chemical Society

On-line version ISSN 0717-9707

Abstract

CARDENAS TRIVINO, GALO; GODOY GUZMAN, OLIVIA  and  CONTRERAS, GUILLERMO. DYSPROSIUM COLLOIDS PREPARED IN POLAR ORGANIC SOLVENTS. J. Chil. Chem. Soc. [online]. 2009, vol.54, n.1, pp.6-11. ISSN 0717-9707.  http://dx.doi.org/10.4067/S0717-97072009000100002.

Dysprosium colloids in organic solvents (2-methoxyethanol, 2-propanol and 1,2-dimethoxyethane) have been obtained by the CLD method al 77 K. These colloids were characterized by zeta potentials, UV-Vis, TEM, electron diffraction and EDX measurements. Colloid stability depends on both solvent and metal concentration. The highest stability was obtained in 2-methoxyethanol, which is in agreement with previous results for other lanthanide colloids already reported. Zeta Potential (ξ) of the colloids ranges between 0.1430 and 1.945 mV. UV-Vis spectra exhibit bands in the UV región. 2-methoxyethanol shows bands at 211 and 283 nm, which is very similar to 1, 2-dimethoxyethane colloids (222 and 273 nm). However, the 2-propanol exhibits a band at 207 nm for a 2.5E-4 M concentration. At the TEM particle size distribution, 2-methoxyethanol colloid exhibits ranges from 2.5 to 11.6 nm, but the 2-propanol shows ranges from 2.5 to 4.3 nm, depending on the polarity of the solvent. The electron diffraction gives the most common phases, corresponding to Dy (002) and Dy203 (110). EDX confirms the metal presence in the colloids. Luminescence measurements for Dy-2-methoxyethanol at 280 nm exhibit a higher quantum yield at 2.0E-3 and 5.0E-4 which indicates a higher transfer from the metal ion to the solvent.

Keywords : Dysprosium colloids; nanoparticles; luminescence; zeta potential.

        · text in English     · English ( pdf )

 

Creative Commons License All the contents of this journal, except where otherwise noted, is licensed under a Creative Commons Attribution License