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The influence of pH and temperature on the equilibrium and dynamic surface tension of aqueous solutions of sodium oleate
YKI – Ytkemiska institutet.
2001 (English)In: Journal of Colloid and Interface Science, ISSN 0021-9797, E-ISSN 1095-7103, Vol. 239, 209-216 p.Article in journal (Refereed)
Abstract [en]

For aqueous solutions of sodium oleate solution, the dynamic surface tension (using the maximum bubble pressure technique) and the equilibrium surface tensions (using the du Noüy ring method) were studied. Experiments were carried out within the pH range 7 to 13 and at temperatures from 20 to 60∞C. From the equilibrium surface tension studies at 25 ∞C, a wide variation in surface activity was found to occur in the premicellar concentration range, depending on pH and oleate concentration and this was explained by the formation of strongly surface active premicellar species. It was also shown that the cmc of the system increased with pH within the pH range 7-12. Dynamic surface tension experiments were carried out from 20 to 60∞C at concentrations beyond the cmc in alkaline solutions, and the adsorption kinetics at the air/solution interface were analysed using established theoretical diffusion models. From this data, the effective diffusion coefficient (Deff) for the oleate species was determined and the presence of an interfacial activation barrier in the diffusion process was confirmed. It was found that the Deff obtained within the temperature range from 40–60∞C at 2-3 mM were in general agreement with previous reported values for the oleate dimer obtained by pulse-gradient FT-NMR. Furthermore, Deff significantly increased with temperature and also increased with concentration at the higher temperature range (> 40 ∞C).

Place, publisher, year, edition, pages
2001. Vol. 239, 209-216 p.
Keyword [en]
Dynamic surface tension, equilibrium surface tension, sodium oleate, diffusion coefficient
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:ri:diva-26699OAI: oai:DiVA.org:ri-26699DiVA: diva2:1053702
Note
A1435Available from: 2016-12-08 Created: 2016-12-08Bibliographically approved

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