Documents disponibles écrits par cet auteur

Membrane emulsification with oscillating and stationary membranes / Richard G. Holdich in Industrial & engineering chemistry research, Vol. 49 N° 8 (Avril 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 8 (Avril 2010) . - pp. 3810–3817 Titre : Membrane emulsification with oscillating and stationary membranes Type de document : texte imprimé Auteurs : Richard G. Holdich, Auteur ; Marijana M. Dragosavac, Auteur ; Goran T. Vladisavljević, Auteur Année de publication : 2010 Article en page(s) : pp. 3810–3817 Note générale : Industrial Chemistry Langues : Anglais (eng) Mots-clés : Membrane  Emulsification  Stationary  Membranes Résumé : Membrane emulsification of sunflower oil in aqueous solutions of 2% (v/v) Tween 20 was performed using a stationary disk membrane with a rotating paddle stirrer and, for comparison, a tubular membrane oscillating normal to the direction of oil flow in an otherwise stationary continuous phase. The oscillation frequency ranged from 10 to 90 Hz. The oil was injected through a sieve-type membrane with a 10 μm pore size and 180 μm between pore spacing at low flux rates to minimize any droplet interference. Using the same membrane material under identical peak shear conditions in both systems, smaller and more uniform drops (30−50 μm median sizes) were produced in the oscillating system. In oscillation, the drop size was modeled by a force balance, including a correction for neck formation at the pore surface, but in the rotating paddle system, neck formation did not appear to be relevant. Drop size was not found to be frequency of oscillation dependent, apart from its influence on the shear stress at the membrane surface. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie900531n [article] Membrane emulsification with oscillating and stationary membranes [texte imprimé] / Richard G. Holdich, Auteur ; Marijana M. Dragosavac, Auteur ; Goran T. Vladisavljević, Auteur . - 2010 . - pp. 3810–3817. Industrial Chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 8 (Avril 2010) . - pp. 3810–3817 Mots-clés : Membrane  Emulsification  Stationary  Membranes Résumé : Membrane emulsification of sunflower oil in aqueous solutions of 2% (v/v) Tween 20 was performed using a stationary disk membrane with a rotating paddle stirrer and, for comparison, a tubular membrane oscillating normal to the direction of oil flow in an otherwise stationary continuous phase. The oscillation frequency ranged from 10 to 90 Hz. The oil was injected through a sieve-type membrane with a 10 μm pore size and 180 μm between pore spacing at low flux rates to minimize any droplet interference. Using the same membrane material under identical peak shear conditions in both systems, smaller and more uniform drops (30−50 μm median sizes) were produced in the oscillating system. In oscillation, the drop size was modeled by a force balance, including a correction for neck formation at the pore surface, but in the rotating paddle system, neck formation did not appear to be relevant. Drop size was not found to be frequency of oscillation dependent, apart from its influence on the shear stress at the membrane surface. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie900531n

Production and evaluation of floating photocatalytic composite particles formed using pickering emulsions and membrane emulsification / Richard G. Holdich in Industrial & engineering chemistry research, Vol. 51 N° 38 (Septembre 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 38 (Septembre 2012) . - pp. 12509–12516 Titre : Production and evaluation of floating photocatalytic composite particles formed using pickering emulsions and membrane emulsification Type de document : texte imprimé Auteurs : Richard G. Holdich, Auteur ; Idil Yilmaz Ipek, Auteur ; Manal Lazrigh, Auteur Année de publication : 2012 Article en page(s) : pp. 12509–12516 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Photocatalytic  Membrane  emulsification Résumé : Floating photocatalytic composite particles were created by injecting a lipid (sunflower oil or liquefied cocoa butter) into an aqueous suspension of TiO2 nanoparticles using the process of membrane emulsification to control the (Pickering) emulsion size. The composite particle median diameters were controlled in a range from 80 to 300 μm. The composite particles floated in water and possessed photocatalytic activity, which was further enhanced by chemically incorporating silver particles into the TiO2 shell. The cocoa butter-based composite particles proved more robust and were not affected by the UV photocatalytic process. Using a combination of cocoa butter and hexane, for the core of the particles, it was possible to generate composite TiO2 and lipid particles with 36 mg of TiO2 per gram of particle. Optimal dye decolorization was achieved with a particle surface coverage of between 60 and 80%. Complete surface coverage resulted in a reduced reaction rate due possibly to reflection of the UV light. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie3001748 [article] Production and evaluation of floating photocatalytic composite particles formed using pickering emulsions and membrane emulsification [texte imprimé] / Richard G. Holdich, Auteur ; Idil Yilmaz Ipek, Auteur ; Manal Lazrigh, Auteur . - 2012 . - pp. 12509–12516. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 38 (Septembre 2012) . - pp. 12509–12516 Mots-clés : Photocatalytic  Membrane  emulsification Résumé : Floating photocatalytic composite particles were created by injecting a lipid (sunflower oil or liquefied cocoa butter) into an aqueous suspension of TiO2 nanoparticles using the process of membrane emulsification to control the (Pickering) emulsion size. The composite particle median diameters were controlled in a range from 80 to 300 μm. The composite particles floated in water and possessed photocatalytic activity, which was further enhanced by chemically incorporating silver particles into the TiO2 shell. The cocoa butter-based composite particles proved more robust and were not affected by the UV photocatalytic process. Using a combination of cocoa butter and hexane, for the core of the particles, it was possible to generate composite TiO2 and lipid particles with 36 mg of TiO2 per gram of particle. Optimal dye decolorization was achieved with a particle surface coverage of between 60 and 80%. Complete surface coverage resulted in a reduced reaction rate due possibly to reflection of the UV light. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie3001748