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Confirmation of the heterocoagulation theory of flotation
YKI – Ytkemiska institutet.
YKI – Ytkemiska institutet.
1999 (English)In: Langmuir, ISSN 0743-7463, E-ISSN 1520-5827, Vol. 15, 7464-7471 p.Article in journal (Refereed)
Abstract [en]

To model the flotation process, we have used the microscopic method developed by Scheludko to study the stability of an aqueous thin film containing tetradecyltrimethylammonium bromide ( C14TAB ) between an air bubble and a silica substrate. Experiments were performed at a range of C14TAB concentrations and pH values. Spontaneous rupture of the thin aqueous film was interpretated in terms of heterocoagulation resulting from the preferential adsorption of relatively low surfactant concentrations at the vapour/solution interface causing a net positive charge while the solution/silica interface remained negatively charged. In addition, during the the three-phase-contact (TPC) expansion or de-wetting step following film rupture, the movement of TPC across the silica substrate leads to transfer of amine from the vapour/solution interface to the vapour/silica. This process resembles a Langmuir-Blodgett deposition process and emphasized the importance of the solution/vapour interface in the de-wetting process.

Place, publisher, year, edition, pages
1999. Vol. 15, 7464-7471 p.
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:ri:diva-27236OAI: oai:DiVA.org:ri-27236DiVA: diva2:1054240
Note
A1252Available from: 2016-12-08 Created: 2016-12-08Bibliographically approved

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