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Effect of short-chain xanthate on electrostatic interactions and equilibrium thickness of foam films from aqueous solutions of non-ionic frother
YKI – Ytkemiska institutet.
1991 (English)In: Surface and Interface Analysis, ISSN 0142-2421, E-ISSN 1096-9918, Vol. 17, 681-685 p.Article in journal (Refereed)
Abstract [en]

Equilibrium thickness of free thin films produced from aqueous solutions of C12(EO)5 surfactant (a model frother) with potassium ethylxanthate-KEX (a model collector) were studied in a wide range of concentrations (from 10-7 M to 2x10-2 M C12(EO)5; up to 10-2 M xanthate). The xanthate was found to behave similar to com_x001F__x001F_mon electrolytes and upon its addition the equilibrium film thickness was reduced, apparently due to the suppression of the electrostatic repulsion. However, at higher C12(EO)5 concentrations (>10-5 M ) the equilibrium thickness of the film increased relative to the thickness established with simple inorganic electrolytes at the same ionic strength. This was explained by the nega_x001F__x001F_tively charged xanthate interacting with the non-ionic frother at the interface and causing a build-up of charge. Higher frother concentrations were necessary to produce non-rupturing films upon increasing KEX content. This "antifoaming" effect of the xanthate compliments its influence on the electrostatic interactions in the film.

Place, publisher, year, edition, pages
1991. Vol. 17, 681-685 p.
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:ri:diva-27473OAI: oai:DiVA.org:ri-27473DiVA: diva2:1054478
Note
A705Available from: 2016-12-08 Created: 2016-12-08Bibliographically approved

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