Documents disponibles écrits par cet auteur

Preparation of nickel nanoparticles in spherical polyelectrolyte brush nanoreactor and their catalytic activity / Zhongming Zhu 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) . - pp. 13848-13853 Titre : Preparation of nickel nanoparticles in spherical polyelectrolyte brush nanoreactor and their catalytic activity Type de document : texte imprimé Auteurs : Zhongming Zhu, Auteur ; Xuhong Guo, Auteur ; Shuang Wu, Auteur Année de publication : 2012 Article en page(s) : pp. 13848-13853 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Catalyst  activity  Polyelectrolyte  Nanoparticle  Preparation Résumé : Nickel nanoparticles (Ni-NPs) with controlled size and narrow size distribution were successfully prepared in spherical poly (acrylic acid) (PAA) brushes (SPBs). The brushes act as nanoreactors for generating the Ni-NPs via adsorption of nickel ions in the brushes and subsequent reduction by addition of NaBH4. The size of Ni-NPs can be well-controlled in several nanometers and with narrow size-distribution. Most interestingly, the size can be tuned by the reaction temperature: the average size increased from 3 to 7 nm upon increasing the reaction temperature from 273 to 303 K. The catalytic activity of these Ni-NPs trapped in SPBs were evaluated using a model reaction based on the reduction of 4-nitrophenol to 4-aminophenol by NaBH4. The kinetic data were observed to follow the pseudofirst-order rate law, and the apparent rate constant was linearly dependent on the total surface area of the Ni-NPs and the reaction temperatures. This work opens a new way to prepare well-controlled Ni-NPs which should be ideal candidates for catalysts with high performance. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=25299850 [article] Preparation of nickel nanoparticles in spherical polyelectrolyte brush nanoreactor and their catalytic activity [texte imprimé] / Zhongming Zhu, Auteur ; Xuhong Guo, Auteur ; Shuang Wu, Auteur . - 2012 . - pp. 13848-13853. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 24 (Décembre 2011) . - pp. 13848-13853 Mots-clés : Catalyst  activity  Polyelectrolyte  Nanoparticle  Preparation Résumé : Nickel nanoparticles (Ni-NPs) with controlled size and narrow size distribution were successfully prepared in spherical poly (acrylic acid) (PAA) brushes (SPBs). The brushes act as nanoreactors for generating the Ni-NPs via adsorption of nickel ions in the brushes and subsequent reduction by addition of NaBH4. The size of Ni-NPs can be well-controlled in several nanometers and with narrow size-distribution. Most interestingly, the size can be tuned by the reaction temperature: the average size increased from 3 to 7 nm upon increasing the reaction temperature from 273 to 303 K. The catalytic activity of these Ni-NPs trapped in SPBs were evaluated using a model reaction based on the reduction of 4-nitrophenol to 4-aminophenol by NaBH4. The kinetic data were observed to follow the pseudofirst-order rate law, and the apparent rate constant was linearly dependent on the total surface area of the Ni-NPs and the reaction temperatures. This work opens a new way to prepare well-controlled Ni-NPs which should be ideal candidates for catalysts with high performance. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=25299850

Recoverable platinum nanocatalysts immobilized on magnetic spherical polyelectrolyte brushes / Shuang Wu in Industrial & engineering chemistry research, Vol. 51 N° 15 (Avril 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 15 (Avril 2012) . - pp. 5608-5614 Titre : Recoverable platinum nanocatalysts immobilized on magnetic spherical polyelectrolyte brushes Type de document : texte imprimé Auteurs : Shuang Wu, Auteur ; Julian Kaiser, Auteur ; Xuhong Guo, Auteur Année de publication : 2012 Article en page(s) : pp. 5608-5614 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Polyelectrolyte Résumé : Recoverable platinum nanocatalysts immobilized on magnetic spherical polyelectrolyte brushes (MSPB) were synthesized and characterized by high resolution transmission electron microscope (HRTEM), thermal gravimetric analysis (TGA), X-ray diffraction (XRD), and vibrating sample magnetometer (VSM). High catalytic activity was found by photometrically monitoring the reduction of 4-nitrophenol by NaBH4 in the presence of MSPB-Pt composites. An excellent stability and recyclability of catalyst was observed after consecutive eight runs following by external magnetic-separation and redispersion. This novel approach provides an excited potential application in preparation of recyclable metal nanocatalysts with high activity. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=25815841 [article] Recoverable platinum nanocatalysts immobilized on magnetic spherical polyelectrolyte brushes [texte imprimé] / Shuang Wu, Auteur ; Julian Kaiser, Auteur ; Xuhong Guo, Auteur . - 2012 . - pp. 5608-5614. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 15 (Avril 2012) . - pp. 5608-5614 Mots-clés : Polyelectrolyte Résumé : Recoverable platinum nanocatalysts immobilized on magnetic spherical polyelectrolyte brushes (MSPB) were synthesized and characterized by high resolution transmission electron microscope (HRTEM), thermal gravimetric analysis (TGA), X-ray diffraction (XRD), and vibrating sample magnetometer (VSM). High catalytic activity was found by photometrically monitoring the reduction of 4-nitrophenol by NaBH4 in the presence of MSPB-Pt composites. An excellent stability and recyclability of catalyst was observed after consecutive eight runs following by external magnetic-separation and redispersion. This novel approach provides an excited potential application in preparation of recyclable metal nanocatalysts with high activity. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=25815841

Synthesis of spherical polyelectrolyte brushes by photoemulsion polymerization with different photoinitiators / Xiang Wang in Industrial & engineering chemistry research, Vol. 50 N° 6 (Mars 2011) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 50 N° 6 (Mars 2011) . - pp. 3564–3569 Titre : Synthesis of spherical polyelectrolyte brushes by photoemulsion polymerization with different photoinitiators Type de document : texte imprimé Auteurs : Xiang Wang, Auteur ; Shuang Wu, Auteur ; Li, Li, Auteur Année de publication : 2011 Article en page(s) : pp. 3564–3569 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : kinetics  Photoemulsion  Polymerization Résumé : Nanosized spherical polyelectrolyte brushes (SPBs) with tunable size and grafting density were synthesized successfully by photoemulsion polymerization using three photoinitiators. Due to their difference in structure, UV absorption, and mechanism of photoinitiation, the kinetics of photoemulsion polymerization using these respective photoinitiators are different. The grafting densities of poly(acrylic acid) (PAA) brushes varied from 0.012 to 0.081 nm−2 by using different photoinitiators, as determined by cutting off the PAA chains from the core particles. All of the spherical PAA brushes prepared by these three photoinitiators are pH and ionic strength sensitive as demonstrated by DLS measurements. Well-defined spherical morphology with narrow size distribution for all of the brushes prepared has been observed by FESEM. This work opens a new way to control the synthesis of SPBs with tunable structure for potential applications in catalysis, wastewater treatment, disease diagnosis, and protein immobilization. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie101764s [article] Synthesis of spherical polyelectrolyte brushes by photoemulsion polymerization with different photoinitiators [texte imprimé] / Xiang Wang, Auteur ; Shuang Wu, Auteur ; Li, Li, Auteur . - 2011 . - pp. 3564–3569. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 6 (Mars 2011) . - pp. 3564–3569 Mots-clés : kinetics  Photoemulsion  Polymerization Résumé : Nanosized spherical polyelectrolyte brushes (SPBs) with tunable size and grafting density were synthesized successfully by photoemulsion polymerization using three photoinitiators. Due to their difference in structure, UV absorption, and mechanism of photoinitiation, the kinetics of photoemulsion polymerization using these respective photoinitiators are different. The grafting densities of poly(acrylic acid) (PAA) brushes varied from 0.012 to 0.081 nm−2 by using different photoinitiators, as determined by cutting off the PAA chains from the core particles. All of the spherical PAA brushes prepared by these three photoinitiators are pH and ionic strength sensitive as demonstrated by DLS measurements. Well-defined spherical morphology with narrow size distribution for all of the brushes prepared has been observed by FESEM. This work opens a new way to control the synthesis of SPBs with tunable structure for potential applications in catalysis, wastewater treatment, disease diagnosis, and protein immobilization. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie101764s

Thermal properties and combustion behaviors of chitosan based flame retardant combining phosphorus and nickel / Shuang Wu in Industrial & engineering chemistry research, Vol. 51 N° 9 (Mars 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 9 (Mars 2012) . - pp. 3663-3669 Titre : Thermal properties and combustion behaviors of chitosan based flame retardant combining phosphorus and nickel Type de document : texte imprimé Auteurs : Shuang Wu, Auteur ; Lei Song, Auteur ; Haifeng Pan, Auteur Année de publication : 2012 Article en page(s) : pp. 3663-3669 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Flame  retardant  Combustion  Thermal  properties Résumé : A renewable carbonization agent based compound nickel chitosan phosphate (NiPCS) has been prepared, which was the combination of flame retardant and synergist. Its effect on thermal properties and flammability of poly(vinyl alcohol) (PVA) has been investigated. Microscale combustion calorimetry (MCC) test proved that NiPCS can decrease the intensities of heat release rate (PHRR) and total heat release rate (THR) greatly. Thermogravimetric analysis (TGA) results indicated that NiPCS possessed a high formation of char. With the increase of the flame retardant, the thermal stability of materials enhanced in high temperature. Real time Fourier transform infrared (RT-IR) data confirmed that the flame retardant can promote the dehydration effect as well as accelerate the char forming. The volatilized products and the synergistic effect of nickel on thermal properties were both investigated with thermogravimetric analysis/infrared spectrometry (TGA-IR) and laser Raman spectroscopy (LRS). The results revealed that nickel restrained the thermal degradation of materials as well as improved the structural organization level of char. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=25595794 [article] Thermal properties and combustion behaviors of chitosan based flame retardant combining phosphorus and nickel [texte imprimé] / Shuang Wu, Auteur ; Lei Song, Auteur ; Haifeng Pan, Auteur . - 2012 . - pp. 3663-3669. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 9 (Mars 2012) . - pp. 3663-3669 Mots-clés : Flame  retardant  Combustion  Thermal  properties Résumé : A renewable carbonization agent based compound nickel chitosan phosphate (NiPCS) has been prepared, which was the combination of flame retardant and synergist. Its effect on thermal properties and flammability of poly(vinyl alcohol) (PVA) has been investigated. Microscale combustion calorimetry (MCC) test proved that NiPCS can decrease the intensities of heat release rate (PHRR) and total heat release rate (THR) greatly. Thermogravimetric analysis (TGA) results indicated that NiPCS possessed a high formation of char. With the increase of the flame retardant, the thermal stability of materials enhanced in high temperature. Real time Fourier transform infrared (RT-IR) data confirmed that the flame retardant can promote the dehydration effect as well as accelerate the char forming. The volatilized products and the synergistic effect of nickel on thermal properties were both investigated with thermogravimetric analysis/infrared spectrometry (TGA-IR) and laser Raman spectroscopy (LRS). The results revealed that nickel restrained the thermal degradation of materials as well as improved the structural organization level of char. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=25595794