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Foaming and dynamic surface tension of aqueous polymer/surfactants solutions 1: ethyl(hydroxyethyl) cellulose and sodium dodecyl sulphate
YKI – Ytkemiska institutet.
2001 (English)In: Colloids and Surfaces A: Physicochemical and Engineering Aspects, ISSN 0927-7757, E-ISSN 1873-4359, Vol. 186, 189-202 p.Article in journal (Refereed)
Abstract [en]

Foaming (in a column) and dynamic surface tension behaviour of aqueous solutions of sodium dodecyl sulphate (SDS), and ethyl (hydroxy ethyl) cellulose/ sodium dodecyl sulphate (EHEC/SDS) mixtures was determined. The results indicated a synergism in foaming and surface activity for the EHEC/SDS mixtures over a specific concentration range. For the SDS solution, the maximum value in Marangoni Elasticity (EM max), as determined from dynamic surface tension data, was reached within a surface age of 0.05s and it could be suggested that in this case EM max was relevant to foam stability. However, for the EHEC (non-foaming solutions), EM max was reached after longer surface ageing periods (0.05-0.1 s). For the EHEC/SDS solutions, EM max occurred over a range of surface ageing periods depending on the polymer/surfactant ratio and no correlation was obtained between EM max and foaming. The EM max time lag for the polymer and polymer/surfactant mixtures was explained by the slower diffusion from solution to the new surface. For the EHEC/SDS, the enhanced the foaming behaviour was explained by the adsorption of surface active polymer/surfactant (clusters) species at the air/solution interface. It was suggested that this could lead to coherent (gelatinous) interfacial layers in the thin film lamella which reduce drainage from the central fluid.

Place, publisher, year, edition, pages
2001. Vol. 186, 189-202 p.
Keyword [en]
Polymer/surfactant interactions, foaming, foam stability, ethyl(hydroxy) ethyl cellulose, sodium dodecyl sulphonate
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:ri:diva-26435OAI: oai:DiVA.org:ri-26435DiVA: diva2:1053437
Note
A1291Available from: 2016-12-08 Created: 2016-12-08Bibliographically approved

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