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Accumulation of dissolved gases at hydrophobic surfaces in water and sodium chloride solutions / Marc A. Hampton in Minerals engineering, Vol. 22 N° 9/10 (Août/Septembre 2009) 

Public ISBD [article]  in Minerals engineering > Vol. 22 N° 9/10 (Août/Septembre 2009) . - pp. 786–792 Titre : Accumulation of dissolved gases at hydrophobic surfaces in water and sodium chloride solutions : Implications for coal flotation Type de document : texte imprimé Auteurs : Marc A. Hampton, Auteur ; Anh V. Nguyen, Auteur Année de publication : 2009 Article en page(s) : pp. 786–792 Note générale : Génie Minier Langues : Anglais (eng) Mots-clés : Coal  Froth  flotation  Mineral  processing Résumé : Dissolved gases can preferentially accumulate at the hydrophobic solid–water interface as revealed by neutron reflectivity measurements. In this paper, atomic force microscopy (AFM) was used to examine accumulation of dissolved gases at a hydrophobic surface in water and sodium chloride solutions. The solvent-exchange method was used to artificially form gaseous domains accumulated at the interface suitable for AFM imaging. Smooth graphite surfaces were used as model surfaces to minimize the secondary effect of surface roughness on the imaging. The concentration of NaCl up to 1 M was found to have a negligible influence on the geometry and population of pre-existing nanobubbles, nanopancakes and nanobubble–nanopancake composites. The implications of the findings on coal flotation in saline water are discussed in terms of attraction between hydrophobic surfaces in water, bubble–particle attachment and hydrophobic coagulation between particles. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S089268750900048X [article] Accumulation of dissolved gases at hydrophobic surfaces in water and sodium chloride solutions : Implications for coal flotation [texte imprimé] / Marc A. Hampton, Auteur ; Anh V. Nguyen, Auteur . - 2009 . - pp. 786–792. Génie Minier Langues : Anglais (eng) in Minerals engineering > Vol. 22 N° 9/10 (Août/Septembre 2009) . - pp. 786–792 Mots-clés : Coal  Froth  flotation  Mineral  processing Résumé : Dissolved gases can preferentially accumulate at the hydrophobic solid–water interface as revealed by neutron reflectivity measurements. In this paper, atomic force microscopy (AFM) was used to examine accumulation of dissolved gases at a hydrophobic surface in water and sodium chloride solutions. The solvent-exchange method was used to artificially form gaseous domains accumulated at the interface suitable for AFM imaging. Smooth graphite surfaces were used as model surfaces to minimize the secondary effect of surface roughness on the imaging. The concentration of NaCl up to 1 M was found to have a negligible influence on the geometry and population of pre-existing nanobubbles, nanopancakes and nanobubble–nanopancake composites. The implications of the findings on coal flotation in saline water are discussed in terms of attraction between hydrophobic surfaces in water, bubble–particle attachment and hydrophobic coagulation between particles. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S089268750900048X