CHEMICAL REACTIONS AT NANOMETAL PARTICLES

The concept of nanochemistry and the reactions involved are discussed. The work is focused on nanoparticles obtained from colloidal dispersions. The colloidal particles by transmission electron microscopy of low and high resolution were analyzed. The high resolution electron miscroscopy (HRTEM) allo...

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Autor principal: CÁRDENAS-TRIVIÑO,GALO
Lenguaje:English
Publicado: Sociedad Chilena de Química 2005
Acceso en línea:http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-97072005000300014
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spelling oai:scielo:S0717-970720050003000142005-11-23CHEMICAL REACTIONS AT NANOMETAL PARTICLESCÁRDENAS-TRIVIÑO,GALOThe concept of nanochemistry and the reactions involved are discussed. The work is focused on nanoparticles obtained from colloidal dispersions. The colloidal particles by transmission electron microscopy of low and high resolution were analyzed. The high resolution electron miscroscopy (HRTEM) allow us to classify the nanostructure of the metal particles in some polyhedral models: cubooctahedron, truncated octahedron, tetracai decahedron and icosahedron. Some HRTEM of Pd-2 propanol and Ge-2-propanol are analyzed. The Pd atoms exhibit a high crystalline nanoparticles, cubooctahedral arrangement in the [001] orientation. On the other hand , the Ge atoms are ordered in a pseudohexagonal arrangement. The spacing in the last system are typical of a diamond cubic Ge structure. The structure of nanometals and also some relevant properties of nanoclusters are discussed. Some heterogeneous catalysis applications of supported metal clusters are discussed. Selective hydrogenation of a, b-unsaturated aldehydes are based on Pd, Rh, Ru, Os, Ir, Ni, Co and Pd.. In particular the crotonaldehyde hydrogenation in the presence of Pd/SiO2, Pd/Al2O3, PdSn/SiO2 and PdSn/Al2O3 was measured. The influence of the organic fragments incorporated on the surface of the particles in the systems mentioned above was studied. Finally, some remarks of the advantage of this technique in order to obtain nanoclusters are summarizedinfo:eu-repo/semantics/openAccessSociedad Chilena de QuímicaJournal of the Chilean Chemical Society v.50 n.3 20052005-09-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-97072005000300014en10.4067/S0717-97072005000300014
institution Scielo Chile
collection Scielo Chile
language English
description The concept of nanochemistry and the reactions involved are discussed. The work is focused on nanoparticles obtained from colloidal dispersions. The colloidal particles by transmission electron microscopy of low and high resolution were analyzed. The high resolution electron miscroscopy (HRTEM) allow us to classify the nanostructure of the metal particles in some polyhedral models: cubooctahedron, truncated octahedron, tetracai decahedron and icosahedron. Some HRTEM of Pd-2 propanol and Ge-2-propanol are analyzed. The Pd atoms exhibit a high crystalline nanoparticles, cubooctahedral arrangement in the [001] orientation. On the other hand , the Ge atoms are ordered in a pseudohexagonal arrangement. The spacing in the last system are typical of a diamond cubic Ge structure. The structure of nanometals and also some relevant properties of nanoclusters are discussed. Some heterogeneous catalysis applications of supported metal clusters are discussed. Selective hydrogenation of a, b-unsaturated aldehydes are based on Pd, Rh, Ru, Os, Ir, Ni, Co and Pd.. In particular the crotonaldehyde hydrogenation in the presence of Pd/SiO2, Pd/Al2O3, PdSn/SiO2 and PdSn/Al2O3 was measured. The influence of the organic fragments incorporated on the surface of the particles in the systems mentioned above was studied. Finally, some remarks of the advantage of this technique in order to obtain nanoclusters are summarized
author CÁRDENAS-TRIVIÑO,GALO
spellingShingle CÁRDENAS-TRIVIÑO,GALO
CHEMICAL REACTIONS AT NANOMETAL PARTICLES
author_facet CÁRDENAS-TRIVIÑO,GALO
author_sort CÁRDENAS-TRIVIÑO,GALO
title CHEMICAL REACTIONS AT NANOMETAL PARTICLES
title_short CHEMICAL REACTIONS AT NANOMETAL PARTICLES
title_full CHEMICAL REACTIONS AT NANOMETAL PARTICLES
title_fullStr CHEMICAL REACTIONS AT NANOMETAL PARTICLES
title_full_unstemmed CHEMICAL REACTIONS AT NANOMETAL PARTICLES
title_sort chemical reactions at nanometal particles
publisher Sociedad Chilena de Química
publishDate 2005
url http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-97072005000300014
work_keys_str_mv AT cardenastrivinogalo chemicalreactionsatnanometalparticles
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