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Boletín de la Sociedad Chilena de Química

versão impressa ISSN 0366-1644

Resumo

CARDENAS T., GALO  e  ACUNA E., JOSE. SYNTHESIS AND CHARACTERIZATION OF MANGANESE COLLOIDS AND ACTIVE SOLIDS PREPARED WITH ORGANICS SOLVENTS. Bol. Soc. Chil. Quím. [online]. 2000, vol.45, n.3, pp.499-507. ISSN 0366-1644.  http://dx.doi.org/10.4067/S0366-16442000000300022.

Manganese colloids were prepared by cocondensation of the metal at 77K with ethanol, 2-propanol, 1,2-dimethoxyethane, 2-methoxyethanol and acetone. The distribution of particle sizes was determined by transmission electron microscopy of the most stable dispersions. Electrophoretic measurements such as: colloid load and zeta potential were achieved. lt was found that the colloids do not possess electrical charge, therefore it is postulated that their stability is by simple solvation. The colloids showed instability at room temperature. In some colloids absorption bands in the UV region were observed. In the visible region no plasma absorption was found. Active solids obtained by evaporation of the solvent contain certain amount of the solvent incorporated, and due to their reactivity they produce a mixture with manganese oxide. The presence of solvents can be observed and their incorporation in the finely divided solids can be observed by FT-IR. Characteristic bands for each solvent were measured. The TGA - FTIR shows the presence of the C = O and C - H bands indicating the acetone in the solid. By means of thermogravimetric analysis and DSC the thermal stability of the solids and the transition heat from the thermal analysis can be determined.

Palavras-chave : Nanostructures; metal colloids; vapor deposition; electron microscopy; infrared spectroscopy.

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