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Formation, stability, and rheology of particle stabilized emulsions / W. J. Frith in Industrial & engineering chemistry research, Vol. 47 N°17 (Septembre 2008) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 47 N°17 (Septembre 2008) . - p. 6434–6444 Titre : Formation, stability, and rheology of particle stabilized emulsions : influence of multivalent cations Type de document : texte imprimé Auteurs : W. J. Frith, Auteur ; R. Pichot, Auteur ; M. Kirkland, Auteur Année de publication : 2008 Article en page(s) : p. 6434–6444 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Oil/Water  emulsions  Hydrophilic  colloidal  silica  particles  Rheology Résumé : Recently, it has been shown that hydrophilic colloidal silica particles (Ludox) can be rendered sufficiently hydrophobic to stabilize oil in water (O/W) emulsions simply by changing the pH of the suspending medium to ∼2, and such emulsions have been shown to display novel rheology (shear thickening) compared to conventional emulsions (Wolf et al. J. Rheol., 2007, 51, 465). However, while lowering pH can render nanosized silica (∼10 nm) sufficiently hydrophobic so as to stabilize O/W emulsions, this method does not appear to generalize to larger silica particles (∼200 nm). In this present study, we explore a different approach, which employs hydrophilic, (i.e., not surface modified) colloidal silica particles to stabilize O/W emulsions in the presence of a range of cations. It appears that certain cations at high pH (in particular La3+) will render various inorganic oxide surfaces more hydrophobic. As such this makes the combination of silica particles with appropriate concentrations of Lanthanum cations an attractive model system for the study of the formulation, stability, and rheological behavior of Pickering emulsions. We present initial investigations exploring the formulation of such emulsions and of how their rheology and stability compare with more conventional emulsions. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie071629e [article] Formation, stability, and rheology of particle stabilized emulsions : influence of multivalent cations [texte imprimé] / W. J. Frith, Auteur ; R. Pichot, Auteur ; M. Kirkland, Auteur . - 2008 . - p. 6434–6444. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 47 N°17 (Septembre 2008) . - p. 6434–6444 Mots-clés : Oil/Water  emulsions  Hydrophilic  colloidal  silica  particles  Rheology Résumé : Recently, it has been shown that hydrophilic colloidal silica particles (Ludox) can be rendered sufficiently hydrophobic to stabilize oil in water (O/W) emulsions simply by changing the pH of the suspending medium to ∼2, and such emulsions have been shown to display novel rheology (shear thickening) compared to conventional emulsions (Wolf et al. J. Rheol., 2007, 51, 465). However, while lowering pH can render nanosized silica (∼10 nm) sufficiently hydrophobic so as to stabilize O/W emulsions, this method does not appear to generalize to larger silica particles (∼200 nm). In this present study, we explore a different approach, which employs hydrophilic, (i.e., not surface modified) colloidal silica particles to stabilize O/W emulsions in the presence of a range of cations. It appears that certain cations at high pH (in particular La3+) will render various inorganic oxide surfaces more hydrophobic. As such this makes the combination of silica particles with appropriate concentrations of Lanthanum cations an attractive model system for the study of the formulation, stability, and rheological behavior of Pickering emulsions. We present initial investigations exploring the formulation of such emulsions and of how their rheology and stability compare with more conventional emulsions. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie071629e