Documents disponibles écrits par cet auteur

Covalent functionalization of graphene with polysaccharides / Qiang Yang in Industrial & engineering chemistry research, Vol. 51 N° 1 (Janvier 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 1 (Janvier 2012) . - pp. 310-317 Titre : Covalent functionalization of graphene with polysaccharides Type de document : texte imprimé Auteurs : Qiang Yang, Auteur ; Xuejun Pan, Auteur Année de publication : 2012 Article en page(s) : pp. 310-317 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Functionalization Résumé : Stable aqueous suspension of graphenes was fabricated from chemical reduction of graphene oxide with the assistance of hydroxypropyl cellulose or chitosan covalently grafted on the graphenes. First, pristine graphite was oxidized using a two-step method (H2SO4 + HNO3 followed by KMnO4). The oxidation-introduced carboayl groups in graphene oxide were then converted into acyl chloride with thionyl chloride. Subsequently, hydroxypropyl cellulose or chitosan was covalently grafted onto the activated graphene oxide through esterification reactions. Finally, the functionalized graphene oxide was chemically reduced to graphene nanosheets with hydrazine. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=25476475 [article] Covalent functionalization of graphene with polysaccharides [texte imprimé] / Qiang Yang, Auteur ; Xuejun Pan, Auteur . - 2012 . - pp. 310-317. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 1 (Janvier 2012) . - pp. 310-317 Mots-clés : Functionalization Résumé : Stable aqueous suspension of graphenes was fabricated from chemical reduction of graphene oxide with the assistance of hydroxypropyl cellulose or chitosan covalently grafted on the graphenes. First, pristine graphite was oxidized using a two-step method (H2SO4 + HNO3 followed by KMnO4). The oxidation-introduced carboayl groups in graphene oxide were then converted into acyl chloride with thionyl chloride. Subsequently, hydroxypropyl cellulose or chitosan was covalently grafted onto the activated graphene oxide through esterification reactions. Finally, the functionalized graphene oxide was chemically reduced to graphene nanosheets with hydrazine. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=25476475

Preliminary study on converting hybrid poplar to high - value chemicals and lignin using organosolv ethanol process / Da-Eun Kim in Industrial & engineering chemistry research, Vol. 49 N° 23 (Décembre 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 23 (Décembre 2010) . - pp. 12156–12163 Titre : Preliminary study on converting hybrid poplar to high - value chemicals and lignin using organosolv ethanol process Type de document : texte imprimé Auteurs : Da-Eun Kim, Auteur ; Xuejun Pan, Auteur Année de publication : 2011 Article en page(s) : pp. 12156–12163 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Organosolv  Ethanol  process Résumé : The organosolv ethanol process was adapted for converting hybrid poplar (Populus nigra L. × P. maximowiczii) into organosolv lignin and saccharide-derived chemicals, such as levulinic acid (LA), hydroxymethylfurfural (HMF), and furfural. The effect of process conditions (temperature, ethanol concentration, sulfuric acid dosage, and reaction time) on product yields was investigated using an experimental matrix designed with response surface methodology (RSM) and small Hartley composite design. The conditions ranged over 173−207 °C, 15−66 min, 2.3−5.7% H2SO4 (SA) on oven-dry wood (w/w), and 33−67% ethanol concentration (v/v). Results indicated that temperature, sulfuric acid loading, and their interaction had a significant effect on the yields of lignin and saccharide-derived chemicals. Comparative investigation of the organosolv process and acid process indicated that ethanol not only enhanced the delignification and production of organosolv lignin, but also improved the conversion yields of pentoses to furfural and hexoses to HMF and LA. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie101671r [article] Preliminary study on converting hybrid poplar to high - value chemicals and lignin using organosolv ethanol process [texte imprimé] / Da-Eun Kim, Auteur ; Xuejun Pan, Auteur . - 2011 . - pp. 12156–12163. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 23 (Décembre 2010) . - pp. 12156–12163 Mots-clés : Organosolv  Ethanol  process Résumé : The organosolv ethanol process was adapted for converting hybrid poplar (Populus nigra L. × P. maximowiczii) into organosolv lignin and saccharide-derived chemicals, such as levulinic acid (LA), hydroxymethylfurfural (HMF), and furfural. The effect of process conditions (temperature, ethanol concentration, sulfuric acid dosage, and reaction time) on product yields was investigated using an experimental matrix designed with response surface methodology (RSM) and small Hartley composite design. The conditions ranged over 173−207 °C, 15−66 min, 2.3−5.7% H2SO4 (SA) on oven-dry wood (w/w), and 33−67% ethanol concentration (v/v). Results indicated that temperature, sulfuric acid loading, and their interaction had a significant effect on the yields of lignin and saccharide-derived chemicals. Comparative investigation of the organosolv process and acid process indicated that ethanol not only enhanced the delignification and production of organosolv lignin, but also improved the conversion yields of pentoses to furfural and hexoses to HMF and LA. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie101671r

Preparation and characterization of water-soluble single-walled carbon nanotubes by hybridization with hydroxypropyl cellulose derivatives / Qiang Yang in Industrial & engineering chemistry research, Vol. 49 N° 6 (Mars 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 6 (Mars 2010) . - pp. 2747–2751 Titre : Preparation and characterization of water-soluble single-walled carbon nanotubes by hybridization with hydroxypropyl cellulose derivatives Type de document : texte imprimé Auteurs : Qiang Yang, Auteur ; Xuejun Pan, Auteur Année de publication : 2010 Article en page(s) : pp. 2747–2751 Note générale : Industrial Chemistry Langues : Anglais (eng) Mots-clés : Characterization;  Water-Soluble;  Carbon  Nanotubes;  Hybridization;  Hydroxypropyl;  Cellulose Résumé : Single-walled carbon nanotube (SWNT) hybrids were prepared through noncovalent functionalization with pyrene-containing hydroxypropyl cellulose derivatives (HPC-Py) that were synthesized by simple condensation and substitution reactions. The obtained SWNT hybrids were structurally characterized with UV−vis, fluorescence, ATR FT-IR, and Raman spectroscopies. The prepared SWNT hybrids were soluble in water with good storage stability, and their statistical average size was approximately 260 nm. The hybridization extent of the SWNTs was dependent on the content of pyrene moieties in HPC-Py. The hydroxypropyl cellulose attached to the surface of the SWNTs was hydrolyzable or removable by cellulases, whereas the SWNTs underwent no structural changes during the enzymatic treatment. Note de contenu : Bibiogr. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie9014149 [article] Preparation and characterization of water-soluble single-walled carbon nanotubes by hybridization with hydroxypropyl cellulose derivatives [texte imprimé] / Qiang Yang, Auteur ; Xuejun Pan, Auteur . - 2010 . - pp. 2747–2751. Industrial Chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 6 (Mars 2010) . - pp. 2747–2751 Mots-clés : Characterization;  Water-Soluble;  Carbon  Nanotubes;  Hybridization;  Hydroxypropyl;  Cellulose Résumé : Single-walled carbon nanotube (SWNT) hybrids were prepared through noncovalent functionalization with pyrene-containing hydroxypropyl cellulose derivatives (HPC-Py) that were synthesized by simple condensation and substitution reactions. The obtained SWNT hybrids were structurally characterized with UV−vis, fluorescence, ATR FT-IR, and Raman spectroscopies. The prepared SWNT hybrids were soluble in water with good storage stability, and their statistical average size was approximately 260 nm. The hybridization extent of the SWNTs was dependent on the content of pyrene moieties in HPC-Py. The hydroxypropyl cellulose attached to the surface of the SWNTs was hydrolyzable or removable by cellulases, whereas the SWNTs underwent no structural changes during the enzymatic treatment. Note de contenu : Bibiogr. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie9014149