SYNTHESIS AND TEM STUDIES OF GALLIUM COLLOIDS PREPARED IN NONAQUEOUS SOLVENTS

In this work metallic colloidal dispersions were obtained by simultaneous co-condensation of gallium atoms with organic solvents at 77 K. The atoms were produced by resistive heating and were reacted with ethanol, 2-propanol, 2-methoxyethanol, acetone and 2-butanone to produce colloids. The kinetic...

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Autores principales:	CÁRDENAS,GALO, SALINAS,SILVANA, OLIVA,RICARDO
Lenguaje:	English
Publicado:	Sociedad Chilena de Química 2003
Materias:	metal colloids nanostructures vapor deposition electron diffraction electron microscopy
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-97072003000100003
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spelling	oai:scielo:S0717-970720030001000032003-05-15SYNTHESIS AND TEM STUDIES OF GALLIUM COLLOIDS PREPARED IN NONAQUEOUS SOLVENTSCÁRDENAS,GALOSALINAS,SILVANAOLIVA,RICARDO metal colloids nanostructures vapor deposition electron diffraction electron microscopy In this work metallic colloidal dispersions were obtained by simultaneous co-condensation of gallium atoms with organic solvents at 77 K. The atoms were produced by resistive heating and were reacted with ethanol, 2-propanol, 2-methoxyethanol, acetone and 2-butanone to produce colloids. The kinetic stability of colloid dispersions was related to the solvation effect of organic molecules, e.g. low stability for ketones and higher stability for 2-propanol colloids. The electrophoretic measurements reveal that particles are negatively charged being 5.1 V for 2-propanol and 0.5 V for 2-butanone. The colloids of Ga-2-propanol and Ga-2-methoxyethanol exhibit an absorption band at 213 and 209 nm, respectively. The transmission electron microscopy studies reveals an average particle size distribution ranging from 1.0 to 1.2 mm depending on the solvent. Most of the colloids exhibit a spherical shape with some degree of agglomeration. The electron diffraction of Ga-colloids shows the presence of a mixture of Ga and Ga2O3 particles. After solvent evaporation, amorphous active powders were obtained. The solids were analyzed by thermogravimetry being Ga-2-methoxyethanol the most stable with a decomposition temperature of 308° C. The Ga-acetone shows two decomposition decays at 98 and 223° C, respectively. Similar behavior was obtained with 2-butanone. The FT-IR confirms the presence of the solvent in the powders. In the case of Ga-acetone and Ga-2-butanone a nu C=O at 1728 cm-1 reveals the solvent incorporation in the active solids.info:eu-repo/semantics/openAccessSociedad Chilena de QuímicaJournal of the Chilean Chemical Society v.48 n.1 20032003-03-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-97072003000100003en10.4067/S0717-97072003000100003
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	metal colloids nanostructures vapor deposition electron diffraction electron microscopy
spellingShingle	metal colloids nanostructures vapor deposition electron diffraction electron microscopy CÁRDENAS,GALO SALINAS,SILVANA OLIVA,RICARDO SYNTHESIS AND TEM STUDIES OF GALLIUM COLLOIDS PREPARED IN NONAQUEOUS SOLVENTS
description	In this work metallic colloidal dispersions were obtained by simultaneous co-condensation of gallium atoms with organic solvents at 77 K. The atoms were produced by resistive heating and were reacted with ethanol, 2-propanol, 2-methoxyethanol, acetone and 2-butanone to produce colloids. The kinetic stability of colloid dispersions was related to the solvation effect of organic molecules, e.g. low stability for ketones and higher stability for 2-propanol colloids. The electrophoretic measurements reveal that particles are negatively charged being 5.1 V for 2-propanol and 0.5 V for 2-butanone. The colloids of Ga-2-propanol and Ga-2-methoxyethanol exhibit an absorption band at 213 and 209 nm, respectively. The transmission electron microscopy studies reveals an average particle size distribution ranging from 1.0 to 1.2 mm depending on the solvent. Most of the colloids exhibit a spherical shape with some degree of agglomeration. The electron diffraction of Ga-colloids shows the presence of a mixture of Ga and Ga2O3 particles. After solvent evaporation, amorphous active powders were obtained. The solids were analyzed by thermogravimetry being Ga-2-methoxyethanol the most stable with a decomposition temperature of 308° C. The Ga-acetone shows two decomposition decays at 98 and 223° C, respectively. Similar behavior was obtained with 2-butanone. The FT-IR confirms the presence of the solvent in the powders. In the case of Ga-acetone and Ga-2-butanone a nu C=O at 1728 cm-1 reveals the solvent incorporation in the active solids.
author	CÁRDENAS,GALO SALINAS,SILVANA OLIVA,RICARDO
author_facet	CÁRDENAS,GALO SALINAS,SILVANA OLIVA,RICARDO
author_sort	CÁRDENAS,GALO
title	SYNTHESIS AND TEM STUDIES OF GALLIUM COLLOIDS PREPARED IN NONAQUEOUS SOLVENTS
title_short	SYNTHESIS AND TEM STUDIES OF GALLIUM COLLOIDS PREPARED IN NONAQUEOUS SOLVENTS
title_full	SYNTHESIS AND TEM STUDIES OF GALLIUM COLLOIDS PREPARED IN NONAQUEOUS SOLVENTS
title_fullStr	SYNTHESIS AND TEM STUDIES OF GALLIUM COLLOIDS PREPARED IN NONAQUEOUS SOLVENTS
title_full_unstemmed	SYNTHESIS AND TEM STUDIES OF GALLIUM COLLOIDS PREPARED IN NONAQUEOUS SOLVENTS
title_sort	synthesis and tem studies of gallium colloids prepared in nonaqueous solvents
publisher	Sociedad Chilena de Química
publishDate	2003
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-97072003000100003
work_keys_str_mv	AT cardenasgalo synthesisandtemstudiesofgalliumcolloidspreparedinnonaqueoussolvents AT salinassilvana synthesisandtemstudiesofgalliumcolloidspreparedinnonaqueoussolvents AT olivaricardo synthesisandtemstudiesofgalliumcolloidspreparedinnonaqueoussolvents
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SYNTHESIS AND TEM STUDIES OF GALLIUM COLLOIDS PREPARED IN NONAQUEOUS SOLVENTS

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