Documents disponibles écrits par cet auteur

Effects of process variables on poly-aluminum chloride (PAC)-rosin sizing performance under neutral papermaking conditions / Yahya Hamzeh in Industrial & engineering chemistry research, Vol. 47 N° 13 (Juillet 2008) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 47 N° 13 (Juillet 2008) . - p. 4302–4307 Titre : Effects of process variables on poly-aluminum chloride (PAC)-rosin sizing performance under neutral papermaking conditions Type de document : texte imprimé Auteurs : Yahya Hamzeh, Auteur ; Mohammad Hassan Ekhtera, Auteur ; Martin A. Hubbe, Auteur ; Soheila Izadyar, Auteur Année de publication : 2008 Article en page(s) : p. 4302–4307 Note générale : Bibliogr. p. 4307 Langues : Anglais (eng) Mots-clés : Poly-aluminum  chloride-rosin;  Sizing  variables Résumé : The effects of process variables, including poly-aluminum chloride (PAC) and rosin levels and equilibration time on PAC−rosin sizing performance, were investigated for three alternative sizing processes, include conventional, reverse sizing, and premixing under neutral papermaking conditions. The individual and interaction effects of sizing variables were determined. It was found that, in contrast to conventional sizing, the sizing efficiency increased with increasing equilibration time when reverse and premixing processes were used for the sizing treatment. In both processes, increasing equilibration time can lead to potential savings in PAC or rosin. Finally, the optimum conditions for more cost-effective sizing were determined for the three sizing processes. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie800107x [article] Effects of process variables on poly-aluminum chloride (PAC)-rosin sizing performance under neutral papermaking conditions [texte imprimé] / Yahya Hamzeh, Auteur ; Mohammad Hassan Ekhtera, Auteur ; Martin A. Hubbe, Auteur ; Soheila Izadyar, Auteur . - 2008 . - p. 4302–4307. Bibliogr. p. 4307 Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 47 N° 13 (Juillet 2008) . - p. 4302–4307 Mots-clés : Poly-aluminum  chloride-rosin;  Sizing  variables Résumé : The effects of process variables, including poly-aluminum chloride (PAC) and rosin levels and equilibration time on PAC−rosin sizing performance, were investigated for three alternative sizing processes, include conventional, reverse sizing, and premixing under neutral papermaking conditions. The individual and interaction effects of sizing variables were determined. It was found that, in contrast to conventional sizing, the sizing efficiency increased with increasing equilibration time when reverse and premixing processes were used for the sizing treatment. In both processes, increasing equilibration time can lead to potential savings in PAC or rosin. Finally, the optimum conditions for more cost-effective sizing were determined for the three sizing processes. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie800107x

Influence of pH and conductivity on properties of paper made of polyelectrolyte multilayered recycled fibers / Hamidreza Rudi in Industrial & engineering chemistry research, Vol. 51 N° 34 (Août 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 34 (Août 2012) . - pp. 11054–11058 Titre : Influence of pH and conductivity on properties of paper made of polyelectrolyte multilayered recycled fibers Type de document : texte imprimé Auteurs : Hamidreza Rudi, Auteur ; Yahya Hamzeh, Auteur ; Ghanbar Ebrahimi, Auteur Année de publication : 2012 Article en page(s) : pp. 11054–11058 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Properties  paper  Polyelectrolyte  Fibers Résumé : This study focuses on the modification of recycled fiber surface through polyelectrolyte multilayer (PEM) assembly of cationic and anionic starches using the layer-by layer (LbL) technique. The properties of handsheets made of those multilayered fibers under various pH values and salt concentrations of the pulp suspension were evaluated. It was found that ζ-potential variations had a close correlation with consecutive multilayer construction, and conductivity shifts influenced ζ-potential and strength characteristics more than varying the pH did. Mechanical properties of the handsheets, i.e., tensile index and internal bonding (Scott type), showed considerable improvement ranging from 125 to 365% depending on the pH and conductivity of the pulp suspension. Moreover, higher pH values between 7.5 and 10 and low electrolyte content around 0.001 M NaCl (140 μS/cm conductivity) were found to be the best conditions to assemble PEMs on recycled fibers, possibly as a consequence of the increased degree of fiber and polyelectrolyte ionization and more efficient conformation of polyelectrolyte. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie301467f [article] Influence of pH and conductivity on properties of paper made of polyelectrolyte multilayered recycled fibers [texte imprimé] / Hamidreza Rudi, Auteur ; Yahya Hamzeh, Auteur ; Ghanbar Ebrahimi, Auteur . - 2012 . - pp. 11054–11058. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 34 (Août 2012) . - pp. 11054–11058 Mots-clés : Properties  paper  Polyelectrolyte  Fibers Résumé : This study focuses on the modification of recycled fiber surface through polyelectrolyte multilayer (PEM) assembly of cationic and anionic starches using the layer-by layer (LbL) technique. The properties of handsheets made of those multilayered fibers under various pH values and salt concentrations of the pulp suspension were evaluated. It was found that ζ-potential variations had a close correlation with consecutive multilayer construction, and conductivity shifts influenced ζ-potential and strength characteristics more than varying the pH did. Mechanical properties of the handsheets, i.e., tensile index and internal bonding (Scott type), showed considerable improvement ranging from 125 to 365% depending on the pH and conductivity of the pulp suspension. Moreover, higher pH values between 7.5 and 10 and low electrolyte content around 0.001 M NaCl (140 μS/cm conductivity) were found to be the best conditions to assemble PEMs on recycled fibers, possibly as a consequence of the increased degree of fiber and polyelectrolyte ionization and more efficient conformation of polyelectrolyte. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie301467f