Documents disponibles écrits par cet auteur

Influence of semibatch emulsification process conditions on the physical characteristics of highly concentrated water - in - oil emulsions / Oscar A. Alvarez 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. 6042–6046 Titre : Influence of semibatch emulsification process conditions on the physical characteristics of highly concentrated water - in - oil emulsions Type de document : texte imprimé Auteurs : Oscar A. Alvarez, Auteur ; Lionel Choplin, Auteur ; Veronique Sadtler, Auteur Année de publication : 2010 Article en page(s) : pp. 6042–6046 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Oil  Emulsions Résumé : We studied the energy consumption per unit volume during preparation of highly concentrated water-in-oil emulsions in a two-step semibatch process. In particular, we studied the effect of two process variables, the water addition flow rate (Qw) and the agitation speed (N). The oil used for emulsion preparation was n-dodecane, the surfactant was sorbitan monooleate (Span 80) and deionized water was used for the dispersed phase. The results obtained showed that two steps were required to get complete incorporation of the dispersed phase and a homogeneous and stable gel-emulsion. With the help of independent physical characteristics measurement performed at the end of the preparation process, we established two functional relationships, relating storage modulus (G′) with energy consumption (Ev), (G′ Ev0.6), and average liquid cell size (Rm) of the dispersed phase with energy consumption (Ev), (Rm EV−0.3). A structural scaling law can be deduced that relates the elastic modulus to the reciprocal of the square of the average liquid’s cell size of the gel-emulsion, corroborated by independent measurements and predicted by recent published models. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie9020073 [article] Influence of semibatch emulsification process conditions on the physical characteristics of highly concentrated water - in - oil emulsions [texte imprimé] / Oscar A. Alvarez, Auteur ; Lionel Choplin, Auteur ; Veronique Sadtler, Auteur . - 2010 . - pp. 6042–6046. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 13 (Juillet 2010) . - pp. 6042–6046 Mots-clés : Oil  Emulsions Résumé : We studied the energy consumption per unit volume during preparation of highly concentrated water-in-oil emulsions in a two-step semibatch process. In particular, we studied the effect of two process variables, the water addition flow rate (Qw) and the agitation speed (N). The oil used for emulsion preparation was n-dodecane, the surfactant was sorbitan monooleate (Span 80) and deionized water was used for the dispersed phase. The results obtained showed that two steps were required to get complete incorporation of the dispersed phase and a homogeneous and stable gel-emulsion. With the help of independent physical characteristics measurement performed at the end of the preparation process, we established two functional relationships, relating storage modulus (G′) with energy consumption (Ev), (G′ Ev0.6), and average liquid cell size (Rm) of the dispersed phase with energy consumption (Ev), (Rm EV−0.3). A structural scaling law can be deduced that relates the elastic modulus to the reciprocal of the square of the average liquid’s cell size of the gel-emulsion, corroborated by independent measurements and predicted by recent published models. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie9020073

Viscous oil emulsification by catastrophic phase inversion / Johanna Galindo-Alvarez in Industrial & engineering chemistry research, Vol. 50 N° 9 (Mai 2011) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 50 N° 9 (Mai 2011) . - pp. 5575-5583 Titre : Viscous oil emulsification by catastrophic phase inversion : influence of oil viscosity and process conditions Type de document : texte imprimé Auteurs : Johanna Galindo-Alvarez, Auteur ; Veronique Sadtler, Auteur ; Lionel Choplin, Auteur Année de publication : 2011 Article en page(s) : pp. 5575-5583 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Viscosity  Phase  reversal  Emulsification Résumé : This study deals with the description of the influence of oil viscosity and process conditions on catastrophic phase inversion, through the analysis of the effects of formulation and process variables on the dispersed phase fraction at which the inversion is triggered. The in situ simultaneous follow-up of viscosity and conductivity measurements allowed, from a process point of view, to emphasize the effect of the aqueous phase addition rate on the catastrophic phase inversion point (PIP) and multiple w/ O/W emulsion formation. Thus if the aqueous phase is added by very small fractions, formulation dominates and the inversion phenomenon can be accelerated, as a consequence of multiple emulsion formation, that greatly increases the volume of effective dispersed phase. An increase in oil viscosity greatly increased the tendency of the oily phase to become the dispersed phase and promoted the formation of highly concentrated emulsions (about 80 to 95% in volume) after inversion. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24128680 [article] Viscous oil emulsification by catastrophic phase inversion : influence of oil viscosity and process conditions [texte imprimé] / Johanna Galindo-Alvarez, Auteur ; Veronique Sadtler, Auteur ; Lionel Choplin, Auteur . - 2011 . - pp. 5575-5583. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 9 (Mai 2011) . - pp. 5575-5583 Mots-clés : Viscosity  Phase  reversal  Emulsification Résumé : This study deals with the description of the influence of oil viscosity and process conditions on catastrophic phase inversion, through the analysis of the effects of formulation and process variables on the dispersed phase fraction at which the inversion is triggered. The in situ simultaneous follow-up of viscosity and conductivity measurements allowed, from a process point of view, to emphasize the effect of the aqueous phase addition rate on the catastrophic phase inversion point (PIP) and multiple w/ O/W emulsion formation. Thus if the aqueous phase is added by very small fractions, formulation dominates and the inversion phenomenon can be accelerated, as a consequence of multiple emulsion formation, that greatly increases the volume of effective dispersed phase. An increase in oil viscosity greatly increased the tendency of the oily phase to become the dispersed phase and promoted the formation of highly concentrated emulsions (about 80 to 95% in volume) after inversion. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24128680