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Controlled size silver nanoparticles synthesis with water - in - oil microemulsion method / Jignasa N. Solanki in Industrial & engineering chemistry research, Vol. 50 N° 22 (Novembre 2011) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 50 N° 22 (Novembre 2011) . - pp. 12311–12323 Titre : Controlled size silver nanoparticles synthesis with water - in - oil microemulsion method : a topical review Type de document : texte imprimé Auteurs : Jignasa N. Solanki, Auteur ; Zagabathuni Venkata Panchakshari Murthy, Auteur Année de publication : 2012 Article en page(s) : pp. 12311–12323 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Nanoparticles  Microemulsion Résumé : Synthesis of noble metallic nanoparticles, in general, and silver nanoparticles (SNPs), in particular, currently are of special interest. In the present paper, an overview of the enhanced properties of SNPs and consequential applications of SNPs are discussed. Common synthesis methods and their comparison with the microemulsion technology, particularly advantages of SNPs formation with microemulsion technology, are discussed. A brief overview of the basics of microemulsion technology for nanoparticles formation is also presented. The complete topical review of microemulsion synthesis technique used to date for the generation of SNPs is discussed comprehensively. Control parameters have been explicated for influencing size, size uniformity, and stability aspects of the SNPs reported in the literature, allowing a tailored synthesis for specific application. Recent modifications made on the synthesis of SNPs to obtain monodisperse, high yield and stability are also discussed. Lastly, some future trends and perspectives in these research areas are outlined. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie201649x [article] Controlled size silver nanoparticles synthesis with water - in - oil microemulsion method : a topical review [texte imprimé] / Jignasa N. Solanki, Auteur ; Zagabathuni Venkata Panchakshari Murthy, Auteur . - 2012 . - pp. 12311–12323. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 22 (Novembre 2011) . - pp. 12311–12323 Mots-clés : Nanoparticles  Microemulsion Résumé : Synthesis of noble metallic nanoparticles, in general, and silver nanoparticles (SNPs), in particular, currently are of special interest. In the present paper, an overview of the enhanced properties of SNPs and consequential applications of SNPs are discussed. Common synthesis methods and their comparison with the microemulsion technology, particularly advantages of SNPs formation with microemulsion technology, are discussed. A brief overview of the basics of microemulsion technology for nanoparticles formation is also presented. The complete topical review of microemulsion synthesis technique used to date for the generation of SNPs is discussed comprehensively. Control parameters have been explicated for influencing size, size uniformity, and stability aspects of the SNPs reported in the literature, allowing a tailored synthesis for specific application. Recent modifications made on the synthesis of SNPs to obtain monodisperse, high yield and stability are also discussed. Lastly, some future trends and perspectives in these research areas are outlined. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie201649x

Reduction of 4 - chlorophenol by Mg and Mg – Ag bimetallic nanocatalysts / Jignasa N. Solanki in Industrial & engineering chemistry research, Vol. 50 N° 24 (Décembre 2011) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 50 N° 24 (Décembre 2011) Titre : Reduction of 4 - chlorophenol by Mg and Mg – Ag bimetallic nanocatalysts Type de document : texte imprimé Auteurs : Jignasa N. Solanki, Auteur ; Zagabathuni Venkata, Auteur ; Panchakshari Murthy, Auteur Année de publication : 2012 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Chlorophenol  Nanocatalysts Résumé : Mg nanocatalyst is successfully synthesized in the present study using wet chemical method via the chemical reduction of magnesium sulfate and a reducing agent (sodium borohydride). Size/size distribution characterization is performed by dynamic light scattering (DLS) and scanning electron microscopy (SEM). Subsequently, 4-chlorophenol compound reduction is systematically studied with Mg catalyst. An ultraviolet―visible light (UV―vis) spectrophotometer is used to study the absorption spectra of in situ reduction reaction with time. Gradual disappearance of the peak corresponding to chloro compounds reveals the degradation of chloro compounds with time. Furthermore, the appearance of a new peak reveals the formation of a respective product (phenol). Mg―Ag bimetallic nanocatalyst is also synthesized via an equivalent chemical method and analogous reduction is performed with the catalyst. The performance of the Mg―Ag bimetallic catalyst is compared with that of the Mg nanocatalyst. Superior dechlorination percentage is observed with the Mg―Ag bimetallic nanocatalyst. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie2022338 [article] Reduction of 4 - chlorophenol by Mg and Mg – Ag bimetallic nanocatalysts [texte imprimé] / Jignasa N. Solanki, Auteur ; Zagabathuni Venkata, Auteur ; Panchakshari Murthy, Auteur . - 2012. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 24 (Décembre 2011) Mots-clés : Chlorophenol  Nanocatalysts Résumé : Mg nanocatalyst is successfully synthesized in the present study using wet chemical method via the chemical reduction of magnesium sulfate and a reducing agent (sodium borohydride). Size/size distribution characterization is performed by dynamic light scattering (DLS) and scanning electron microscopy (SEM). Subsequently, 4-chlorophenol compound reduction is systematically studied with Mg catalyst. An ultraviolet―visible light (UV―vis) spectrophotometer is used to study the absorption spectra of in situ reduction reaction with time. Gradual disappearance of the peak corresponding to chloro compounds reveals the degradation of chloro compounds with time. Furthermore, the appearance of a new peak reveals the formation of a respective product (phenol). Mg―Ag bimetallic nanocatalyst is also synthesized via an equivalent chemical method and analogous reduction is performed with the catalyst. The performance of the Mg―Ag bimetallic catalyst is compared with that of the Mg nanocatalyst. Superior dechlorination percentage is observed with the Mg―Ag bimetallic nanocatalyst. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie2022338

Reduction of nitro aromatic compounds over Ag/Al2O3 nanocatalyst prepared in water-in-oil microemulsion / Jignasa N. Solanki in Industrial & engineering chemistry research, Vol. 50 N° 12 (Juin 2011) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 50 N° 12 (Juin 2011) . - pp. 7338-7344 Titre : Reduction of nitro aromatic compounds over Ag/Al2O3 nanocatalyst prepared in water-in-oil microemulsion : effects of water-to-surfactant mole ratio and type of reducing agent Type de document : texte imprimé Auteurs : Jignasa N. Solanki, Auteur ; Zagabathuni Venkata Panchakshari Murthy, Auteur Année de publication : 2011 Article en page(s) : pp. 7338-7344 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Surfactant  Microemulsion Résumé : Silver nanoparticles, with controlled sizes, are synthesized by chemical reduction of silver nitrate with sodium borohydride reducing agent by microemulsion method. To obtain small and monodisperse particles, as-synthesized Ag nanoparticles are readily tuned by varying the water-to-surfactant mole ratio, ω (most crucial operating parameter), and the type of reducing agent. Superior nanoparticles are obtained at intermediate ω (ω = 3). When hydrazine hydrate is used as reducing agent, further superior nanoparticles are obtained with a calculated surface area of 9.76 x 108 mm2/g and hence are chosen for further nanocatalyst synthesis by proper deposition of the same on alumina support. The catalyst is analyzed with UV―visible spectroscopy and X-ray diffraction techniques to confirm the presence of metallic silver. The synthesized catalyst can be conveniently recovered from the reaction system, leading to easy monitoring of the catalytic reaction by spectroscopic methods. Accordingly, reduction of model nitro aromatic compounds, viz., 4-nitrophenol and 4-nitroaniline, are studied. Gradual disappearance of the peak corresponding to nitro compounds reveals the degradation of nitro compounds with time. Furthermore, the appearance and increase of new peaks with time reveal the progressive formation of respective products. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24239049 [article] Reduction of nitro aromatic compounds over Ag/Al2O3 nanocatalyst prepared in water-in-oil microemulsion : effects of water-to-surfactant mole ratio and type of reducing agent [texte imprimé] / Jignasa N. Solanki, Auteur ; Zagabathuni Venkata Panchakshari Murthy, Auteur . - 2011 . - pp. 7338-7344. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 12 (Juin 2011) . - pp. 7338-7344 Mots-clés : Surfactant  Microemulsion Résumé : Silver nanoparticles, with controlled sizes, are synthesized by chemical reduction of silver nitrate with sodium borohydride reducing agent by microemulsion method. To obtain small and monodisperse particles, as-synthesized Ag nanoparticles are readily tuned by varying the water-to-surfactant mole ratio, ω (most crucial operating parameter), and the type of reducing agent. Superior nanoparticles are obtained at intermediate ω (ω = 3). When hydrazine hydrate is used as reducing agent, further superior nanoparticles are obtained with a calculated surface area of 9.76 x 108 mm2/g and hence are chosen for further nanocatalyst synthesis by proper deposition of the same on alumina support. The catalyst is analyzed with UV―visible spectroscopy and X-ray diffraction techniques to confirm the presence of metallic silver. The synthesized catalyst can be conveniently recovered from the reaction system, leading to easy monitoring of the catalytic reaction by spectroscopic methods. Accordingly, reduction of model nitro aromatic compounds, viz., 4-nitrophenol and 4-nitroaniline, are studied. Gradual disappearance of the peak corresponding to nitro compounds reveals the degradation of nitro compounds with time. Furthermore, the appearance and increase of new peaks with time reveal the progressive formation of respective products. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24239049