The effects of hydrophobicity and orientation of cubic particles on the stability of thin films / G. Morris in Minerals engineering, Vol. 23 N° 11-13 (Octobre 2010)  

Public ISBD [article]  inMinerals engineering > Vol. 23 N° 11-13 (Octobre 2010) . - pp. 979–984 Titre : The effects of hydrophobicity and orientation of cubic particles on the stability of thin films Type de document : texte imprimé Auteurs : G. Morris, Auteur ; S.J. Neethling, Auteur ; J. J. Cilliers, Auteur Année de publication : 2011 Article en page(s) : pp. 979–984 Note générale : Génie Minier Langues : Anglais (eng) Mots-clés : Flotation froths Froth flotation Modelling Simulation Résumé : A three-dimensional model of a single cubic particle in a thin liquid film has been developed using the Surface Evolver (Brakke, 1992) program. It has been used to investigate the effect of a particle’s contact angle on its energetically stable orientations at a liquid–vapour interface and how these, in turn, affect the particle’s ability to stabilise a thin film. It has been found that depending on the contact angle there are two possible stable orientations for a cubic particle (termed horizontal and rotated) at a liquid–vapour interface. For a film containing a cubic particle in a rotated orientation it has been found that the capillary pressure required to rupture the film is roughly 30% of that required for a film containing a particle of the same contact angle but in a horizontal orientation. The probability of a particle adopting one orientation over another is also investigated, showing that this too is affected by contact angle and leading to the conclusion that contact angle has a profound effect on non-spherical particles behaviour in thin films. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687510000956 [article] The effects of hydrophobicity and orientation of cubic particles on the stability of thin films [texte imprimé] / G. Morris, Auteur ; S.J. Neethling, Auteur ; J. J. Cilliers, Auteur . - 2011 . - pp. 979–984. Génie Minier Langues : Anglais (eng) in Minerals engineering > Vol. 23 N° 11-13 (Octobre 2010) . - pp. 979–984 Mots-clés : Flotation froths Froth flotation Modelling Simulation Résumé : A three-dimensional model of a single cubic particle in a thin liquid film has been developed using the Surface Evolver (Brakke, 1992) program. It has been used to investigate the effect of a particle’s contact angle on its energetically stable orientations at a liquid–vapour interface and how these, in turn, affect the particle’s ability to stabilise a thin film. It has been found that depending on the contact angle there are two possible stable orientations for a cubic particle (termed horizontal and rotated) at a liquid–vapour interface. For a film containing a cubic particle in a rotated orientation it has been found that the capillary pressure required to rupture the film is roughly 30% of that required for a film containing a particle of the same contact angle but in a horizontal orientation. The probability of a particle adopting one orientation over another is also investigated, showing that this too is affected by contact angle and leading to the conclusion that contact angle has a profound effect on non-spherical particles behaviour in thin films. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687510000956

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