Adsorption of ionic surfactants in particulate systems: flotation, stability, and interaction forces

Bremmell, K. E., Jameson, G. J. and Biggs, S. (1999) Adsorption of ionic surfactants in particulate systems: flotation, stability, and interaction forces. Colloids and Surfaces A: Physicochemical and Engineering Aspects, 146 1-3: 75-87. doi:10.1016/S0927-7757(98)00802-4


Author Bremmell, K. E.
Jameson, G. J.
Biggs, S.
Title Adsorption of ionic surfactants in particulate systems: flotation, stability, and interaction forces
Journal name Colloids and Surfaces A: Physicochemical and Engineering Aspects   Check publisher's open access policy
ISSN 0927-7757
1873-4359
Publication date 1999-01-15
Year available 1999
Sub-type Article (original research)
DOI 10.1016/S0927-7757(98)00802-4
Volume 146
Issue 1-3
Start page 75
End page 87
Total pages 13
Place of publication Amsterdam, Netherlands
Publisher Elsevier
Language eng
Abstract The flotation efficiency of silica particles using the ionic surfactants, sodium dodecylbenzenesulfonate (SDbS) and cetyltrimethylammonium bromide (CPB), have been investigated. Results from adsorption, electrophoretic mobility, dispersion stability and direct interaction force measurements are used to develop an understanding of the role of ionic surfactants in particulate flotation. Adsorption and mobility data indicate that SDbS adsorbs at the silica/solution interface, though without improving the flotation efficiency. CPB was found to adsorb on the silica particles as a result of electrostatic interaction; initially to neutralize the surface charge and destabilize the suspension, and at higher surfactant concentrations, to reverse the particle charge and re-stabilize the suspension. Direct force measurements in the presence of CPB confirm that the electrostatic interactions between approaching surfaces are neutralized at low CPB concentrations. Additionally, evidence for a strong adhesive interaction after contact is seen. At higher concentrations, the surfaces begin to recharge, and the adhesive interaction decreases in magnitude. The flotation efficiency was found to correlate well with the measured particle interactions, and to be a function of the particulate electrophoretic mobility.
Keyword Ionic surfactants
Adsorption
Direct interaction forces
Electrophoretic mobility
Stability
Flotation
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Faculty of Engineering, Architecture and Information Technology Publications
Non HERDC
 
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