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Controlling factors on droplets uniformity in membrane emulsification / Dong-Xia Hao in Industrial & engineering chemistry research, Vol. 47 N°17 (Septembre 2008) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 47 N°17 (Septembre 2008) . - p. 6418–6425 Titre : Controlling factors on droplets uniformity in membrane emulsification : experiment and modeling analysis Type de document : texte imprimé Auteurs : Dong-Xia Hao, Auteur ; Fang-Ling Gong, Auteur ; Guo-Hua Hu, Auteur Année de publication : 2008 Article en page(s) : p. 6418–6425 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Membrane  emulsification  Oil-in-water  emulsion  Droplet  size  distribution Résumé : The membrane emulsification process is attracting great interest in many industrial fields. For optimization and scaling up of the emulsification process, controlling the emulsion uniformity using monitoring process and membrane parameters is especially important. In this study, the effects of phase physical property (viscosity, interfacial tension), and operation conditions (trans-membrane pressure shear stress), on droplet size distribution of an oil-in-water (o/w) emulsion were systemically investigated by membrane emulsification experiments with a cross-flowing continuous phase. Inspired by the idea that droplet spontaneous formation is one of the most important mechanisms to form a uniform emulsion, a simple model based on torque balance equations by describing the variable force torques on droplet formation process was proposed to predict experimental tendencies. The experiment phenomena showed a good coincidence with model prediction. The following experiment conditions were found to facilitate the production of uniform droplets: (1) low cross-flow velocity of the continuous phase, (2) low transmembrane pressure, (3) high viscosity of the dispersed phase, and (4) an emulsifier with great ability and rapid rate to decrease interfacial tension. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie8000315 [article] Controlling factors on droplets uniformity in membrane emulsification : experiment and modeling analysis [texte imprimé] / Dong-Xia Hao, Auteur ; Fang-Ling Gong, Auteur ; Guo-Hua Hu, Auteur . - 2008 . - p. 6418–6425. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 47 N°17 (Septembre 2008) . - p. 6418–6425 Mots-clés : Membrane  emulsification  Oil-in-water  emulsion  Droplet  size  distribution Résumé : The membrane emulsification process is attracting great interest in many industrial fields. For optimization and scaling up of the emulsification process, controlling the emulsion uniformity using monitoring process and membrane parameters is especially important. In this study, the effects of phase physical property (viscosity, interfacial tension), and operation conditions (trans-membrane pressure shear stress), on droplet size distribution of an oil-in-water (o/w) emulsion were systemically investigated by membrane emulsification experiments with a cross-flowing continuous phase. Inspired by the idea that droplet spontaneous formation is one of the most important mechanisms to form a uniform emulsion, a simple model based on torque balance equations by describing the variable force torques on droplet formation process was proposed to predict experimental tendencies. The experiment phenomena showed a good coincidence with model prediction. The following experiment conditions were found to facilitate the production of uniform droplets: (1) low cross-flow velocity of the continuous phase, (2) low transmembrane pressure, (3) high viscosity of the dispersed phase, and (4) an emulsifier with great ability and rapid rate to decrease interfacial tension. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie8000315

Dissipative particle dynamics and flory − huggins theories for predicting the rheological behavior of ultrahigh molecular weight polyethylene blends / Jing-Gang Gai in Industrial & engineering chemistry research, Vol. 49 N° 22 (Novembre 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 22 (Novembre 2010) . - pp. 11369-11379 Titre : Dissipative particle dynamics and flory − huggins theories for predicting the rheological behavior of ultrahigh molecular weight polyethylene blends Type de document : texte imprimé Auteurs : Jing-Gang Gai, Auteur ; Guo-Hua Hu, Auteur ; Hui-Lin Li, Auteur Année de publication : 2011 Article en page(s) : pp. 11369-11379 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Prediction Résumé : This work aims to experimentally and theoretically study the effects of normal molecular weight polymers (NMWP) such as high-density polyethylene, low-density polyethylene, and polypropylene as processing aids on the morphology and rheological behavior of ultrahigh molecular weight polyethylene (UHMWPE). As is shown by scanning electron microscope observations, rheological measurements, and dissipative particle dynamics simulations, formation of a lubricating phase between the UHMWPE particles is responsible for the viscosity reduction of the UHMWPE. Besides, phase diagram studies on the UHMWPE/NMWP blend suggest that the optimum composition ratio of the blends lies in their composition-sensitive region when the parameter χ and molecular weight of each component are fixed at low shear rates. Meanwhile, the optimum range of parameter χ is above but close to the corresponding binodal curve at high shear rates. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=23437834 [article] Dissipative particle dynamics and flory − huggins theories for predicting the rheological behavior of ultrahigh molecular weight polyethylene blends [texte imprimé] / Jing-Gang Gai, Auteur ; Guo-Hua Hu, Auteur ; Hui-Lin Li, Auteur . - 2011 . - pp. 11369-11379. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 22 (Novembre 2010) . - pp. 11369-11379 Mots-clés : Prediction Résumé : This work aims to experimentally and theoretically study the effects of normal molecular weight polymers (NMWP) such as high-density polyethylene, low-density polyethylene, and polypropylene as processing aids on the morphology and rheological behavior of ultrahigh molecular weight polyethylene (UHMWPE). As is shown by scanning electron microscope observations, rheological measurements, and dissipative particle dynamics simulations, formation of a lubricating phase between the UHMWPE particles is responsible for the viscosity reduction of the UHMWPE. Besides, phase diagram studies on the UHMWPE/NMWP blend suggest that the optimum composition ratio of the blends lies in their composition-sensitive region when the parameter χ and molecular weight of each component are fixed at low shear rates. Meanwhile, the optimum range of parameter χ is above but close to the corresponding binodal curve at high shear rates. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=23437834

Procédés d'extrusion réactive / Berzin, Françoise in Techniques de l'ingénieur AM, Vol. AM5 (Trimestriel) 

Public ISBD [article]  in Techniques de l'ingénieur AM > Vol. AM5 (Trimestriel) . - 16 p. Titre : Procédés d'extrusion réactive Type de document : texte imprimé Auteurs : Berzin, Françoise, Auteur ; Guo-Hua Hu, Auteur Année de publication : 2007 Article en page(s) : 16 p. Note générale : Plastiques et Composites Langues : Français (fre) Mots-clés : Extrusion  réactive REFERENCE : AM 3 654 DEWEY : 668.4 Date : Juillet 2004 RAMEAU : Extrusion En ligne : http://www.techniques-ingenieur.fr [article] Procédés d'extrusion réactive [texte imprimé] / Berzin, Françoise, Auteur ; Guo-Hua Hu, Auteur . - 2007 . - 16 p. Plastiques et Composites Langues : Français (fre) in Techniques de l'ingénieur AM > Vol. AM5 (Trimestriel) . - 16 p. Mots-clés : Extrusion  réactive REFERENCE : AM 3 654 DEWEY : 668.4 Date : Juillet 2004 RAMEAU : Extrusion En ligne : http://www.techniques-ingenieur.fr