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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