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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

Rapid synthesis of uniform magnetic microspheres by combing premix membrane emulsification and in situ formation techniques / Jian Yang in Industrial & engineering chemistry research, Vol. 49 N° 13 (Juillet 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 13 (Juillet 2010) . - pp. 6047–6053 Titre : Rapid synthesis of uniform magnetic microspheres by combing premix membrane emulsification and in situ formation techniques Type de document : texte imprimé Auteurs : Jian Yang, Auteur ; Dong-Xia Hao, Auteur ; Cai-Xia Bi, Auteur Année de publication : 2010 Article en page(s) : pp. 6047–6053 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Magnetic  Microspheres Résumé : Uniform magnetic poly(styrene-co-2-hydroxyethyl methacrylate) (PST-HEMA) microspheres were fabricated by a novel route combining premix membrane emulsification of double emulsion and an in situ magnetization technique. The fabrication involved, first, the preparation of uniform double W/O/W emulsions with ferrous ferric solution as the internal water phase and dichloromethane dissolved with PST-HEMA as the oil phase by premix SPG membrane emulsification. Then, the inner ferrous ferric solution was in situ magnetized into nanoparticles by adding the ammonia solution into the external water phase. This W/O/S emulsion was finally solidified into microspores by solvent evaporation. Results showed that the in situ magnetization technique could effectively overcome the encapsulation difficulties in traditional synthesis routes due to poorer affinity between iron oxide nanoparticles and polymer, and facilitated the enhancement of encapsulation efficiency with a high magnetization up to 14.23 emu/g. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie902053u [article] Rapid synthesis of uniform magnetic microspheres by combing premix membrane emulsification and in situ formation techniques [texte imprimé] / Jian Yang, Auteur ; Dong-Xia Hao, Auteur ; Cai-Xia Bi, Auteur . - 2010 . - pp. 6047–6053. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 13 (Juillet 2010) . - pp. 6047–6053 Mots-clés : Magnetic  Microspheres Résumé : Uniform magnetic poly(styrene-co-2-hydroxyethyl methacrylate) (PST-HEMA) microspheres were fabricated by a novel route combining premix membrane emulsification of double emulsion and an in situ magnetization technique. The fabrication involved, first, the preparation of uniform double W/O/W emulsions with ferrous ferric solution as the internal water phase and dichloromethane dissolved with PST-HEMA as the oil phase by premix SPG membrane emulsification. Then, the inner ferrous ferric solution was in situ magnetized into nanoparticles by adding the ammonia solution into the external water phase. This W/O/S emulsion was finally solidified into microspores by solvent evaporation. Results showed that the in situ magnetization technique could effectively overcome the encapsulation difficulties in traditional synthesis routes due to poorer affinity between iron oxide nanoparticles and polymer, and facilitated the enhancement of encapsulation efficiency with a high magnetization up to 14.23 emu/g. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie902053u