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The role of surfactant head group in the dynamic emulsification process. Single surfactant systems
YKI – Ytkemiska institutet.
2003 (English)In: Journal of Colloid and Interface Science, ISSN 0021-9797, E-ISSN 1095-7103, Vol. 257, 337-343 p.Article in journal (Refereed)
Abstract [en]

To clarify the effect of the surfactant head group on the emulsification process, dilute dodecane in water emulsions were prepared in a small flow-through cell with three surfactants which had the same hydrocarbon tail length but different head groups. The different surfactants types were (a) a nonionic, hexa(ethyleneglycol) mono n-dodecyl ether (C12E6), (b) an anionic, sodium dodecyl sulfate (SDS), and (c) a cationic, n-dodecyl pyridinium chloride (DPC), and the emulsions were prepared under the same conditions. From dynamic light scattering measurements, it was shown that the mean steady state droplet size of the emulsions (obtained after 20 min dispersion) could be related to the interfacial tension at concentrations in the region of the cmc. This result was in agreement with laminar and turbulent viscous flow theory. However, the particle size versus surface tension data for the different surfactant systems did not fall on a single line. This behavior suggested that the surfactant played a secondary role in defining the droplet size (in addition to reducing the interfacial tension) possibly through diffusion and relaxation, during deformation of the interface. In addition, it was found that the values of the equilibrium "surfactant packing densities" of the different surfactants at the oil/water interface were almost equal near the cmc, but the mean droplet size and the interfacial tension at the cmc decreased following the order DPC>SDS>C12E6

Place, publisher, year, edition, pages
2003. Vol. 257, 337-343 p.
Keyword [en]
Surfactant head group, emulsification, shear, emulsion droplet size
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:ri:diva-26682OAI: oai:DiVA.org:ri-26682DiVA: diva2:1053685
Note
A1516Available from: 2016-12-08 Created: 2016-12-08Bibliographically approved

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