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Basic amid acid-assisted synthesis of resorcinol-formaldehyde polymer and carbon nanospheres / Yong-Rong Dong in Industrial & engineering chemistry research, Vol. 47 n°14 (Juillet 2008) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 47 n°14 (Juillet 2008) . - p. 4712-4716 Titre : Basic amid acid-assisted synthesis of resorcinol-formaldehyde polymer and carbon nanospheres Type de document : texte imprimé Auteurs : Yong-Rong Dong, Auteur ; Norikazu Nishiyama, Auteur ; Yasuyuki Egashira, Auteur ; Korekazu Ueyama, Auteur Année de publication : 2008 Article en page(s) : p. 4712-4716 Note générale : Bibliogr. p. 4716 Langues : Anglais (eng) Mots-clés : Resorcinol/formaldehyde;  Amino  acid;  Polymer  nanospheres Résumé : Polymer nanospheres were synthesized through polymerization of resorcinol/formaldehyde (RF) in the presence of a basic amino acid, l-lysine, as a catalyst. The diameters of the RF polymer nanospheres can be tuned in the range of 30-650 nm by adjusting the molar ratios of l-lysine/H2O and resorcinol/H2O in the precursor solutions. The pH of l-lysine solution was reduced from 9.3 to 7.0 just after it was mixed with the RF solution, indicating that l-lysine molecules in the solution were consumed by interacting with resorcinol. As a result, particle growth rate extremely reduces. Thus, the particle size of the RF polymer was not much dependent with synthesis time. Thus, the use of l-lysine facilitates precise control of the size of the RF polymer nanospheres compared to the synthesis using an ammonia solution as a catalyst. Carbonized particles showed the same size as the RF polymer nanospheres. The resulting carbon nanospheres had mesopores and macropores with a surface area of 330-400 m2/g. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie7017417 [article] Basic amid acid-assisted synthesis of resorcinol-formaldehyde polymer and carbon nanospheres [texte imprimé] / Yong-Rong Dong, Auteur ; Norikazu Nishiyama, Auteur ; Yasuyuki Egashira, Auteur ; Korekazu Ueyama, Auteur . - 2008 . - p. 4712-4716. Bibliogr. p. 4716 Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 47 n°14 (Juillet 2008) . - p. 4712-4716 Mots-clés : Resorcinol/formaldehyde;  Amino  acid;  Polymer  nanospheres Résumé : Polymer nanospheres were synthesized through polymerization of resorcinol/formaldehyde (RF) in the presence of a basic amino acid, l-lysine, as a catalyst. The diameters of the RF polymer nanospheres can be tuned in the range of 30-650 nm by adjusting the molar ratios of l-lysine/H2O and resorcinol/H2O in the precursor solutions. The pH of l-lysine solution was reduced from 9.3 to 7.0 just after it was mixed with the RF solution, indicating that l-lysine molecules in the solution were consumed by interacting with resorcinol. As a result, particle growth rate extremely reduces. Thus, the particle size of the RF polymer was not much dependent with synthesis time. Thus, the use of l-lysine facilitates precise control of the size of the RF polymer nanospheres compared to the synthesis using an ammonia solution as a catalyst. Carbonized particles showed the same size as the RF polymer nanospheres. The resulting carbon nanospheres had mesopores and macropores with a surface area of 330-400 m2/g. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie7017417