Accumulation of dissolved gases at hydrophobic surfaces in water and sodium chloride solutions: Implications for coal flotation

Hampton, M. A. and Nguyen, A. V. (2009) Accumulation of dissolved gases at hydrophobic surfaces in water and sodium chloride solutions: Implications for coal flotation. Minerals Engineering, 22 9-10: 786-792.


Author Hampton, M. A.
Nguyen, A. V.
Title Accumulation of dissolved gases at hydrophobic surfaces in water and sodium chloride solutions: Implications for coal flotation
Journal name Minerals Engineering   Check publisher's open access policy
ISSN 0892-6875
Publication date 2009-08-13
Year available 2009
Sub-type Article (original research)
DOI 10.1016/j.mineng.2009.02.006
Volume 22
Issue 9-10
Start page 786
End page 792
Total pages 7
Editor Wills, B.A.
Place of publication Amstedam, Netherlands
Publisher Elsevier
Collection year 2010
Language eng
Subject C1
030603 Colloid and Surface Chemistry
970103 Expanding Knowledge in the Chemical Sciences
Abstract 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
Keyword Coal
Froth Flotation
Atomic-force Microscopy
Self-assembled Monolayers
Long-range Attraction
Bubble Coalescence
Inorganic electrolytes
Neutron Reflectivity
Nonwetting Liquid
Wetting Films
Fine Coal
Q-Index Code C1
Q-Index Status Confirmed Code

Document type: Journal Article
Sub-type: Article (original research)
Collections: 2010 Higher Education Research Data Collection
School of Chemical Engineering Publications
 
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Created: Wed, 24 Feb 2010, 13:48:00 EST by Mr Marc Hampton on behalf of School of Chemical Engineering