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A comparative study of surfactant adsorption on model surfaces using the quartz crystal microbalance and the ellipsometer
YKI – Ytkemiska institutet.
YKI – Ytkemiska institutet.
2002 (English)In: Journal of Colloid and Interface Science, ISSN 0021-9797, E-ISSN 1095-7103, Vol. 253, 190-195 p.Article in journal (Refereed)
Abstract [en]

The nature of hexaethylene glycol mono-n-tetradecyl ether (C14EO6) layers adsorbed onto different model surfaces was systematically investigated by means of QCM-D (quartz crystal microbalance-dissipation) and ellipsometry. The amount of non-ionic surfactant adsorbed is determined both at hydrophilic and hydrophobic surfaces. In particular, the substrates employed were hydrophilic silica, hydrophobized silica (using dimethyldichlorosilane), and hydrophobized gold surfaces (using 10-thiodecane and 16-thiohexadecane). It was shown that the frequency shift obtained from the QCM-D experiments results in an overestimation of the adsorbed mass. This is attributed to two different effects, viz. water that is coupled to the adsorbed layer due to hydration of the polar region of the surfactant and second water that for other reasons is trapped within the adsorbed layer. Furthermore, from the ellipsometry data the adsorbed layer thickness is determined. By combining the thickness information and the dissipation parameter (obtained from the QCM-D experiments), we note that the dissipation parameter is insufficient in describing the viscoelastic character of thin surfactant films

Place, publisher, year, edition, pages
2002. Vol. 253, 190-195 p.
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:ri:diva-26692OAI: oai:DiVA.org:ri-26692DiVA: diva2:1053695
Note
A1568Available from: 2016-12-08 Created: 2016-12-08Bibliographically approved

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