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More benign synthesis of palladium nanoparticles in dimethyl sulfoxide and their extraction into an organic pohase / Juncheng Liu in Industrial & engineering chemistry research, Vol. 49 N° 17 (Septembre 1, 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 17 (Septembre 1, 2010) . - pp 8174–8179 Titre : More benign synthesis of palladium nanoparticles in dimethyl sulfoxide and their extraction into an organic pohase Type de document : texte imprimé Auteurs : Juncheng Liu, Auteur ; Nicholas Ruffini, Auteur ; Pamela Pollet, Auteur Année de publication : 2010 Article en page(s) : pp 8174–8179 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Nanoparticles  Dimethyl  Organic  phase. Résumé : We present the successful synthesis and stabilization of 3.5 nm Pd nanoparticles (standard deviation of 0.49 nm) within dimethyl sulfoxide (DMSO) via fast, homogeneous reduction of a Pd salt using NaBH4 in the absence of traditional capping ligands. These Pd nanoparticles were found to be extremely stable and did not exhibit precipitation and/or agglomeration within the DMSO solvent even after more than 9 months. Moreover, these Pd nanoparticles were conveniently separated from the DMSO solvent medium via vacuum freeze drying by taking advantage of the high freezing point of DMSO. We have also successfully extracted the Pd nanoparticles from the DMSO phase into an organic phase (i.e., hexane), thereby providing a facile and efficient means for the generation of organic phase dispersible metal nanoparticles with complete recycle of the DMSO solvent. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie902013g [article] More benign synthesis of palladium nanoparticles in dimethyl sulfoxide and their extraction into an organic pohase [texte imprimé] / Juncheng Liu, Auteur ; Nicholas Ruffini, Auteur ; Pamela Pollet, Auteur . - 2010 . - pp 8174–8179. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 17 (Septembre 1, 2010) . - pp 8174–8179 Mots-clés : Nanoparticles  Dimethyl  Organic  phase. Résumé : We present the successful synthesis and stabilization of 3.5 nm Pd nanoparticles (standard deviation of 0.49 nm) within dimethyl sulfoxide (DMSO) via fast, homogeneous reduction of a Pd salt using NaBH4 in the absence of traditional capping ligands. These Pd nanoparticles were found to be extremely stable and did not exhibit precipitation and/or agglomeration within the DMSO solvent even after more than 9 months. Moreover, these Pd nanoparticles were conveniently separated from the DMSO solvent medium via vacuum freeze drying by taking advantage of the high freezing point of DMSO. We have also successfully extracted the Pd nanoparticles from the DMSO phase into an organic phase (i.e., hexane), thereby providing a facile and efficient means for the generation of organic phase dispersible metal nanoparticles with complete recycle of the DMSO solvent. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie902013g

One-step “green” synthesis of Pd nanoparticles of controlled size and their catalytic activity for trichloroethene hydrodechlorination / Feng He in Industrial & engineering chemistry research, Vol. 48 N° 14 (Juillet 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N° 14 (Juillet 2009) . - pp. 6550–6557 Titre : One-step “green” synthesis of Pd nanoparticles of controlled size and their catalytic activity for trichloroethene hydrodechlorination Type de document : texte imprimé Auteurs : Feng He, Auteur ; Juncheng Liu, Auteur ; Christopher B. Roberts, Auteur Année de publication : 2009 Article en page(s) : pp. 6550–6557 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Pd  nanoparticles  Controlled  size  One-step  “green”  approach Résumé : We present here a straightforward, one-step “green” approach for preparing Pd nanoparticles of controlled size and size distribution. The new catalysts were synthesized using a low-cost, biocompatible cellulose, sodium carboxymethyl cellulose (CMC), as a stabilizer and ascorbic acid as a reducing agent at temperatures ranging from 22 to 95 °C. The mean size and polydispersivity (expressed as standard deviation, SD) of the Pd nanoparticles was exponentially reduced by increasing the preparation temperature from 22 to 95 °C. At 95 °C, nearly monodisperse Pd nanoparticles were obtained with a mean diameter of 3.6 nm (SD = 0.5 nm). The Pd nanoparticles exhibited high catalytic reactivity when tested for hydrodechlorination of trichloroethene in the presence of H2. The observed pseudofirst-order reaction rate constant, kobs, was up to 692 L g−1 min−1, which is comparable to the Pd nanoparticles synthesized per the conventional borohydride reduction method. This new approach not only offers a simple way to manipulate particle size and size distribution but also eliminates the need of borohydride, which is much more costly and less environmentally friendly than the ascorbic acid used in this work. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie801962f [article] One-step “green” synthesis of Pd nanoparticles of controlled size and their catalytic activity for trichloroethene hydrodechlorination [texte imprimé] / Feng He, Auteur ; Juncheng Liu, Auteur ; Christopher B. Roberts, Auteur . - 2009 . - pp. 6550–6557. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 14 (Juillet 2009) . - pp. 6550–6557 Mots-clés : Pd  nanoparticles  Controlled  size  One-step  “green”  approach Résumé : We present here a straightforward, one-step “green” approach for preparing Pd nanoparticles of controlled size and size distribution. The new catalysts were synthesized using a low-cost, biocompatible cellulose, sodium carboxymethyl cellulose (CMC), as a stabilizer and ascorbic acid as a reducing agent at temperatures ranging from 22 to 95 °C. The mean size and polydispersivity (expressed as standard deviation, SD) of the Pd nanoparticles was exponentially reduced by increasing the preparation temperature from 22 to 95 °C. At 95 °C, nearly monodisperse Pd nanoparticles were obtained with a mean diameter of 3.6 nm (SD = 0.5 nm). The Pd nanoparticles exhibited high catalytic reactivity when tested for hydrodechlorination of trichloroethene in the presence of H2. The observed pseudofirst-order reaction rate constant, kobs, was up to 692 L g−1 min−1, which is comparable to the Pd nanoparticles synthesized per the conventional borohydride reduction method. This new approach not only offers a simple way to manipulate particle size and size distribution but also eliminates the need of borohydride, which is much more costly and less environmentally friendly than the ascorbic acid used in this work. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie801962f