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Surfactant distribution in waterborne acrylic films. 2 Surface Investigation
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2011 (English)In: Colloids and Surfaces A: Physicochemical and Engineering Aspects, ISSN 0927-7757, E-ISSN 1873-4359, Vol. 374, no 1-3, p. 58-68Article in journal (Refereed)
Abstract [en]

This paper presents results on sodium dodecyl sulfate (SDS) enrichment at the surface of pure acrylic or acrylic/laponite composite latex films. Surface concentrations were measured by Confocal Raman Spectroscopy leading to higher values than the nominal concentration of 6 wt%. X-ray Photoelectron Spectroscopy (XPS) analyses showed uppermost surface layers saturated with SDS in most cases. High resolution Atomic Force Microscopy (AFM) revealed a variety of morphologies for these surfactant top layers, highlighting the occurrence of SDS bilayers in different configurations. In an attempt to check for a correlation between the surface concentration of the surfactant in dry films and the concentration of free surfactant in water in the initial latex, this latter concentration was determined from the level of the plateau in adsorption isotherms. Adsorption studies by conductimetry showed an unexpected increase of the amount of adsorbed SDS with pH. The proposed interpretation is that, upon acrylic acid neutralization, the chains at the surface become more hydrophilic and spread out in water, revealing more sites for SDS to adsorb on. No correlation between free surfactant and surface enrichment could be established, indicating that the enrichment process is more complex than expected.

Place, publisher, year, edition, pages
2011. Vol. 374, no 1-3, p. 58-68
Keyword [en]
Latex film, Surfactant distribution, Surface enrichment, SDS, Adsorption isotherm, Confocal Raman Spectroscopy, XPS, AFM Surfactant distribution in waterborne acrylic films Surface Investigation
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Natural Sciences
Identifiers
URN: urn:nbn:se:ri:diva-26385DOI: 10.1016/j.colsurfa.2010.11.008OAI: oai:DiVA.org:ri-26385DiVA, id: diva2:1053387
Note
A2086Available from: 2016-12-08 Created: 2016-12-08 Last updated: 2017-11-29Bibliographically approved

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