Functionalized membranes by layer-by-layer assembly of polyelectrolytes and in situ polymerization of acrylic acid for applications in enzymatic catalysis / Saurav Datta in Industrial & engineering chemistry research, Vol. 47 n°14 (Juillet 2008)  

Public ISBD [article]  inIndustrial & engineering chemistry research > Vol. 47 n°14 (Juillet 2008) . - p. 4586–4597 Titre : Functionalized membranes by layer-by-layer assembly of polyelectrolytes and in situ polymerization of acrylic acid for applications in enzymatic catalysis Type de document : texte imprimé Auteurs : Saurav Datta, Auteur ; Caitlyn Cecil, Auteur ; Bhattacharyya, D., Auteur Année de publication : 2008 Article en page(s) : p. 4586–4597 Note générale : Bibliogr. p. 4595-4597 Langues : Anglais (eng) Mots-clés : Functionalized polymeric membrane  Enzymatic catalysis  Layer-by-layer assembly technique Résumé : This research work was directed toward the development of highly active, stable, and reusable functionalized polymeric membrane domains for enzymatic catalysis. Functionalized membranes were created by two different approaches. In the first approach, which involved alternative attachment of cationic and anionic polyelectrolytes, functionalization was performed using a layer-by-layer (LBL) assembly technique within a nylon-based microfiltration (MF) membrane. In the second approach, a hydrophobic polyvinylidene fluoride (PVDF) MF membrane was functionalized by the in situ polymerization of acrylic acid. The enzyme, glucose oxidase (GOX), was then electrostatically immobilized inside the functionalized membrane domains to study the catalytic oxidation of glucose to gluconic acid and H2O2. Characterization of the functionalized membranes, in terms of polyelectrolyte/polymer domains and permeate flux, was also conducted. The kinetics of H2O2 formation was discussed, along with the effects of residence time and pH on the activity of GOX. The stability and reusability of the electrostatically immobilized enzymatic system were also investigated. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie800142d [article] Functionalized membranes by layer-by-layer assembly of polyelectrolytes and in situ polymerization of acrylic acid for applications in enzymatic catalysis [texte imprimé] / Saurav Datta, Auteur ; Caitlyn Cecil, Auteur ; Bhattacharyya, D., Auteur . - 2008 . - p. 4586–4597. Bibliogr. p. 4595-4597 Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 47 n°14 (Juillet 2008) . - p. 4586–4597 Mots-clés : Functionalized polymeric membrane  Enzymatic catalysis  Layer-by-layer assembly technique Résumé : This research work was directed toward the development of highly active, stable, and reusable functionalized polymeric membrane domains for enzymatic catalysis. Functionalized membranes were created by two different approaches. In the first approach, which involved alternative attachment of cationic and anionic polyelectrolytes, functionalization was performed using a layer-by-layer (LBL) assembly technique within a nylon-based microfiltration (MF) membrane. In the second approach, a hydrophobic polyvinylidene fluoride (PVDF) MF membrane was functionalized by the in situ polymerization of acrylic acid. The enzyme, glucose oxidase (GOX), was then electrostatically immobilized inside the functionalized membrane domains to study the catalytic oxidation of glucose to gluconic acid and H2O2. Characterization of the functionalized membranes, in terms of polyelectrolyte/polymer domains and permeate flux, was also conducted. The kinetics of H2O2 formation was discussed, along with the effects of residence time and pH on the activity of GOX. The stability and reusability of the electrostatically immobilized enzymatic system were also investigated. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie800142d

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Solid oxide fuel cell modeling / Gebregergis, A. in IEEE transactions on industrial electronics, Vol. 56 N°1 (Janvier 2009)  

Public ISBD [article]  inIEEE transactions on industrial electronics > Vol. 56 N°1 (Janvier 2009) . - pp. 139 - 148 Titre : Solid oxide fuel cell modeling Type de document : texte imprimé Auteurs : Gebregergis, A., Auteur ; Pillay, P., Auteur ; Bhattacharyya, D., Auteur Année de publication : 2009 Article en page(s) : pp. 139 - 148 Note générale : electronic Langues : Anglais (eng) Mots-clés : equivalent circuits  lumped parameter networks  real-time systems  solid oxide fuel cells Résumé : This paper discusses the modeling of a solid oxide fuel cell using both lumped and distributed modeling approaches. In particular, the focus of this paper is on the development of a computationally efficient lumped-parameter model for real-time emulation and control. The performance of this model is compared with a detailed distributed model and experimental results. The fundamental relations that govern a fuel cell operation are utilized in both approaches. However, the partial pressure of the species (fuel, air, and water) in the distributed model is assumed to vary through the length of the fuel cell. The lumped model approach uses the partial pressure of the species at the exit point of the fuel cell. The partial pressure of the species is represented by an equivalent RC circuit in the lumped model. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=4682693&sortType%3Das [...] [article] Solid oxide fuel cell modeling [texte imprimé] / Gebregergis, A., Auteur ; Pillay, P., Auteur ; Bhattacharyya, D., Auteur . - 2009 . - pp. 139 - 148. electronic Langues : Anglais (eng) in IEEE transactions on industrial electronics > Vol. 56 N°1 (Janvier 2009) . - pp. 139 - 148 Mots-clés : equivalent circuits  lumped parameter networks  real-time systems  solid oxide fuel cells Résumé : This paper discusses the modeling of a solid oxide fuel cell using both lumped and distributed modeling approaches. In particular, the focus of this paper is on the development of a computationally efficient lumped-parameter model for real-time emulation and control. The performance of this model is compared with a detailed distributed model and experimental results. The fundamental relations that govern a fuel cell operation are utilized in both approaches. However, the partial pressure of the species (fuel, air, and water) in the distributed model is assumed to vary through the length of the fuel cell. The lumped model approach uses the partial pressure of the species at the exit point of the fuel cell. The partial pressure of the species is represented by an equivalent RC circuit in the lumped model. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=4682693&sortType%3Das [...]

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