Documents disponibles écrits par cet auteur

Analysis of the princen and kiss equation to model the storage modulus of highly concentrated emulsions / Emilio Paruta-Tuarez in Industrial & engineering chemistry research, Vol. 50 N° 17 (Septembre 2011) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 50 N° 17 (Septembre 2011) . - pp. 10359-10365 Titre : Analysis of the princen and kiss equation to model the storage modulus of highly concentrated emulsions Type de document : texte imprimé Auteurs : Emilio Paruta-Tuarez, Auteur ; Philippe Marchal, Auteur ; Veronique Sadtler, Auteur Année de publication : 2011 Article en page(s) : pp. 10359-10365 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Emulsion  Storage  Modeling Résumé : The universality of the model proposed by Princen and Kiss is analyzed in the case of highly concentrated water-in-oil emulsions containing dispersed-phase volume fractions (φ) ranging from 0.89 to 0.97. Although Princen and Kiss equation has been rigorously established for a two-dimensional system and involves no adjustable parameter, the model for a tridimensional system, which is an extrapolation of the 2D model, requires the introduction of a phenomenological linear function E(φ) to account for experimental deviations. As mentioned by Princen and Kiss themselves, there is no satisfactory theoretical derivation of E(φ). Indeed, in this paper we point out that the linear dependence in φ of E(φ) is a consequence of the particular set of experimental data exploited by Princen and Kiss. Another choice of experimental data could have led to propose other mathematical functions since at very high volume fraction, some experimental data found in the literature show a more rapid increase of the storage modulus G′ with φ than predicted by Princen and Kiss equation, which tends to underestimate the values of G′. Finally, for the studied highly concentrated emulsions, the dispersed-phase volume fraction dependence of storage modulus is discussed. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24483682 [article] Analysis of the princen and kiss equation to model the storage modulus of highly concentrated emulsions [texte imprimé] / Emilio Paruta-Tuarez, Auteur ; Philippe Marchal, Auteur ; Veronique Sadtler, Auteur . - 2011 . - pp. 10359-10365. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 17 (Septembre 2011) . - pp. 10359-10365 Mots-clés : Emulsion  Storage  Modeling Résumé : The universality of the model proposed by Princen and Kiss is analyzed in the case of highly concentrated water-in-oil emulsions containing dispersed-phase volume fractions (φ) ranging from 0.89 to 0.97. Although Princen and Kiss equation has been rigorously established for a two-dimensional system and involves no adjustable parameter, the model for a tridimensional system, which is an extrapolation of the 2D model, requires the introduction of a phenomenological linear function E(φ) to account for experimental deviations. As mentioned by Princen and Kiss themselves, there is no satisfactory theoretical derivation of E(φ). Indeed, in this paper we point out that the linear dependence in φ of E(φ) is a consequence of the particular set of experimental data exploited by Princen and Kiss. Another choice of experimental data could have led to propose other mathematical functions since at very high volume fraction, some experimental data found in the literature show a more rapid increase of the storage modulus G′ with φ than predicted by Princen and Kiss equation, which tends to underestimate the values of G′. Finally, for the studied highly concentrated emulsions, the dispersed-phase volume fraction dependence of storage modulus is discussed. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24483682

Heteroflocculation of a cationic oil - in - water emulsion resulting from fontainebleau’s sandstone powder addition as a model for asphalt emulsion breakup / Ronald A. Mercado in Industrial & engineering chemistry research, Vol. 51 N° 36 (Septembre 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 36 (Septembre 2012) . - pp. 11688-11694 Titre : Heteroflocculation of a cationic oil - in - water emulsion resulting from fontainebleau’s sandstone powder addition as a model for asphalt emulsion breakup Type de document : texte imprimé Auteurs : Ronald A. Mercado, Auteur ; Veronique Sadtler, Auteur ; Philippe Marchal, Auteur Année de publication : 2012 Article en page(s) : pp. 11688-11694 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Modeling  Powder  Emulsion Résumé : The use of asphalt emulsions for road fabrication is rapidly gaining in importance mainly due to energy savings, less environmental impact, and better properties of the final product. However, the formulation of these emulsions still requires a better understanding, particularly concerning their breaking phenomena. When a cationic model emulsion is contacted with a solid having a negative-charged surface, physicochemical driving forces result in the emulsion destabilization. As a consequence, a viscosity reduction of the remaining emulsion is observed, as well as the emulsion breakup through a heteroflocculation mechanism provided the solid surface is large enough. Emulsion systems at equilibrium, containing cetylpyridinium chloride (CPC), paraffin oil, and Fontainebleau's sandstone powder and having different droplet sizes, are studied. The results show that the dispersed oil fraction decreases after each addition of sandstone aliquots, and this depends on the concentration of CPC in the continuous phase of the emulsion. As the droplet size and distribution remain constant during the process, it is assumed that the emulsion heteroflocculation is the result of direct oil droplets adhesion on the sand surface, followed by their coalescence around the sand particles. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26350336 [article] Heteroflocculation of a cationic oil - in - water emulsion resulting from fontainebleau’s sandstone powder addition as a model for asphalt emulsion breakup [texte imprimé] / Ronald A. Mercado, Auteur ; Veronique Sadtler, Auteur ; Philippe Marchal, Auteur . - 2012 . - pp. 11688-11694. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 36 (Septembre 2012) . - pp. 11688-11694 Mots-clés : Modeling  Powder  Emulsion Résumé : The use of asphalt emulsions for road fabrication is rapidly gaining in importance mainly due to energy savings, less environmental impact, and better properties of the final product. However, the formulation of these emulsions still requires a better understanding, particularly concerning their breaking phenomena. When a cationic model emulsion is contacted with a solid having a negative-charged surface, physicochemical driving forces result in the emulsion destabilization. As a consequence, a viscosity reduction of the remaining emulsion is observed, as well as the emulsion breakup through a heteroflocculation mechanism provided the solid surface is large enough. Emulsion systems at equilibrium, containing cetylpyridinium chloride (CPC), paraffin oil, and Fontainebleau's sandstone powder and having different droplet sizes, are studied. The results show that the dispersed oil fraction decreases after each addition of sandstone aliquots, and this depends on the concentration of CPC in the continuous phase of the emulsion. As the droplet size and distribution remain constant during the process, it is assumed that the emulsion heteroflocculation is the result of direct oil droplets adhesion on the sand surface, followed by their coalescence around the sand particles. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26350336