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Hydrogel nanopowder production by inverse - miniemulsion polymerization and supercritical drying / Melinda G. Hemingway in Industrial & engineering chemistry research, Vol. 49 N° 20 (Octobre 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 20 (Octobre 2010) . - pp. 10094–10099 Titre : Hydrogel nanopowder production by inverse - miniemulsion polymerization and supercritical drying Type de document : texte imprimé Auteurs : Melinda G. Hemingway, Auteur ; Gupta, Ram B., Auteur ; David J. Elton, Auteur Année de publication : 2011 Article en page(s) : pp. 10094–10099 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Drying  Supercritical  state  Polymerization  Production Résumé : Hydrogel nanoparticles can be successfully produced by polymerization in inverse miniemulsions, for use in a variety of applications including diagnosis, drug delivery, separation, soil stabilization, and absorption. Unfortunately, conventional drying techniques result in agglomerated powder due to the sticky nature of the wet hydrogel particles. This work utilizes supercritical CO2 drying to obtain free-flowing hydrogel nanoparticles. Polyacrylamide hydrogel nanoparticles (100 nm in diameter) are produced in an inverse miniemulsion composed of a cyclohexane continuous phase, a water dispersed phase, and a nonionic surfactant. The polymerized miniemulsion is dried by injection into supercritical CO2 which results in rapid removal of cyclohexane, water, and surfactant. The morphology, particle size, and size distribution of the nanoparticles are determined using dynamic light scattering and scanning electron microscopy. The proposed miniemulsion polymerization supercritical drying (MPSD) method produces a hydrogel nanopowder with much lower agglomeration or residual surfactant as compared to convention drying. In addition, the MPSD method produced solvent-free nanoparticles due to efficient extraction by supercritical CO2. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=23325832 [article] Hydrogel nanopowder production by inverse - miniemulsion polymerization and supercritical drying [texte imprimé] / Melinda G. Hemingway, Auteur ; Gupta, Ram B., Auteur ; David J. Elton, Auteur . - 2011 . - pp. 10094–10099. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 20 (Octobre 2010) . - pp. 10094–10099 Mots-clés : Drying  Supercritical  state  Polymerization  Production Résumé : Hydrogel nanoparticles can be successfully produced by polymerization in inverse miniemulsions, for use in a variety of applications including diagnosis, drug delivery, separation, soil stabilization, and absorption. Unfortunately, conventional drying techniques result in agglomerated powder due to the sticky nature of the wet hydrogel particles. This work utilizes supercritical CO2 drying to obtain free-flowing hydrogel nanoparticles. Polyacrylamide hydrogel nanoparticles (100 nm in diameter) are produced in an inverse miniemulsion composed of a cyclohexane continuous phase, a water dispersed phase, and a nonionic surfactant. The polymerized miniemulsion is dried by injection into supercritical CO2 which results in rapid removal of cyclohexane, water, and surfactant. The morphology, particle size, and size distribution of the nanoparticles are determined using dynamic light scattering and scanning electron microscopy. The proposed miniemulsion polymerization supercritical drying (MPSD) method produces a hydrogel nanopowder with much lower agglomeration or residual surfactant as compared to convention drying. In addition, the MPSD method produced solvent-free nanoparticles due to efficient extraction by supercritical CO2. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=23325832