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Collective particle interactions in the sedimentation of charged colloidal suspensions / Jan Vesaratchanon in Industrial & engineering chemistry research, Vol. 48 N°1 (Janvier 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N°1 (Janvier 2009) . - p. 80-84 Titre : Collective particle interactions in the sedimentation of charged colloidal suspensions Type de document : texte imprimé Auteurs : Jan Vesaratchanon, Editeur scientifique ; Alex Nikolov, Editeur scientifique ; Darsh T. Wasan, Editeur scientifique Année de publication : 2009 Article en page(s) : p. 80-84 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Sedimentation  Monodisperse  colloidal  Microstructure  formation Résumé : The sedimentation of a similarly charged monodisperse colloidal suspension was studied to investigate the role of collective particle interactions affecting the rate of sedimentation and thereby the stability. The particle concentration profiles, microstructure formation, and the sedimentation rates were determined using a nondestructive back-light scattering technique. Stochastic particle dynamics simulations using the Beresford-Smith and Derjaguin−Landau−Verwey−Overbeek repulsive pair potentials were carried out to predict the sedimentation rates. In addition, Monte Carlo simulations were performed to reveal the particle microstructure formation. The collective particle interactions result in an oscillatory effective potential of interaction between the identically charged particles, even though the pair potential is repulsive, and lead to a more ordered microstructure formation and reduction in the sedimentation rate. The theoretical predictions, which were in good agreement with the experimental measurements, clearly showed the importance of the collective particle interaction effect in stabilizing the monodisperse suspension. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie8004176 [article] Collective particle interactions in the sedimentation of charged colloidal suspensions [texte imprimé] / Jan Vesaratchanon, Editeur scientifique ; Alex Nikolov, Editeur scientifique ; Darsh T. Wasan, Editeur scientifique . - 2009 . - p. 80-84. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N°1 (Janvier 2009) . - p. 80-84 Mots-clés : Sedimentation  Monodisperse  colloidal  Microstructure  formation Résumé : The sedimentation of a similarly charged monodisperse colloidal suspension was studied to investigate the role of collective particle interactions affecting the rate of sedimentation and thereby the stability. The particle concentration profiles, microstructure formation, and the sedimentation rates were determined using a nondestructive back-light scattering technique. Stochastic particle dynamics simulations using the Beresford-Smith and Derjaguin−Landau−Verwey−Overbeek repulsive pair potentials were carried out to predict the sedimentation rates. In addition, Monte Carlo simulations were performed to reveal the particle microstructure formation. The collective particle interactions result in an oscillatory effective potential of interaction between the identically charged particles, even though the pair potential is repulsive, and lead to a more ordered microstructure formation and reduction in the sedimentation rate. The theoretical predictions, which were in good agreement with the experimental measurements, clearly showed the importance of the collective particle interaction effect in stabilizing the monodisperse suspension. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie8004176

Vertical Spreading of Aqueous Trisiloxane Solution Driven by a Spontaneously Developing Surface Tension Gradient / Anoop Chengara in Industrial & engineering chemistry research, Vol. 47 N°10 (Mai 2008) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 47 N°10 (Mai 2008) . - p. 3639–3644 Titre : Vertical Spreading of Aqueous Trisiloxane Solution Driven by a Spontaneously Developing Surface Tension Gradient Type de document : texte imprimé Auteurs : Anoop Chengara, Auteur ; Alex D. Nikolov, Auteur ; Darsh T. Wasan, Auteur Année de publication : 2008 Article en page(s) : p. 3639–3644 Langues : Anglais (eng) Mots-clés : Spontaneous  ;  Trisiloxane  surfactants  ;  Aqueous  film Résumé : This article reports the results of experiments conducted on the spontaneous climbing of an aqueous film of trisiloxane surfactants (“superspreaders”) on a vertical strongly hydrophobic solid surface. The final height achieved is much in excess of that expected purely on the basis of the capillary wetting action and suggests that a spontaneously developing surface tension gradient aids in film climbing. Maxima are observed in both the spreading rate and the height achieved as a function of the surfactant concentration, similar to the spreading of a superspreader drop on a horizontal hydrophobic surface. En ligne : https://pubs.acs.org/doi/abs/10.1021/ie070862%2B [article] Vertical Spreading of Aqueous Trisiloxane Solution Driven by a Spontaneously Developing Surface Tension Gradient [texte imprimé] / Anoop Chengara, Auteur ; Alex D. Nikolov, Auteur ; Darsh T. Wasan, Auteur . - 2008 . - p. 3639–3644. Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 47 N°10 (Mai 2008) . - p. 3639–3644 Mots-clés : Spontaneous  ;  Trisiloxane  surfactants  ;  Aqueous  film Résumé : This article reports the results of experiments conducted on the spontaneous climbing of an aqueous film of trisiloxane surfactants (“superspreaders”) on a vertical strongly hydrophobic solid surface. The final height achieved is much in excess of that expected purely on the basis of the capillary wetting action and suggests that a spontaneously developing surface tension gradient aids in film climbing. Maxima are observed in both the spreading rate and the height achieved as a function of the surfactant concentration, similar to the spreading of a superspreader drop on a horizontal hydrophobic surface. En ligne : https://pubs.acs.org/doi/abs/10.1021/ie070862%2B