Change search
ReferencesLink to record
Permanent link

Direct link
Globotriose- and oligo(ethylene glycol)-terminated self-assembled monolayers: Surface forces, wetting, and surfactant adsorption
KTH, School of Chemical Science and Engineering (CHE), Chemistry, Surface Chemistry (closed 20081231).ORCID iD: 0000-0001-7496-1101
KTH, School of Chemical Science and Engineering (CHE), Chemistry, Surface Chemistry (closed 20081231).
Department of Physics, Chemistry and Biology, Linköping University.
Department of Physics, Chemistry and Biology, Linköping University.
2006 (English)In: Langmuir, ISSN 0743-7463, E-ISSN 1520-5827, Vol. 22, no 24, 10038-10046 p.Article in journal (Refereed) Published
Abstract [en]

A set of oligo( ethylene glycol)-terminated and globotriose-terminated self-assembled monolayers (SAMs) has been prepared on gold substrates. Such model surfaces are well defined and have good stability due to the strong binding of thiols and disulfides to the gold substrate. They are thus very suitable for addressing questions related to effects of surface composition on wetting properties, surface interactions, and surfactant adsorption. These issues are addressed in this report. Accurate wetting tension measurements have been performed as a function of temperature using the Wilhelmy plate technique. The results show that the nonpolar character of oligo( ethylene glycol)-terminated SAMs increases slightly but significantly with temperature in the range 20-55 degrees C. On the other hand, globotriose-terminated SAMs are fully wetted by water at room temperature. Surface forces measurements have been performed and demonstrated that the interactions between oligo( ethylene glycol)-terminated SAMs are purely repulsive and similar to those determined between adsorbed surfactant layers with the same terminal headgroup. On the other hand, the interactions between globotriose-terminated SAMs include a short-range attractive force component that is strongly affected by the packing density in the layer. In some cases it is found that the attractive force component increases with contact time. Both these observations are rationalized by an orientation- and conformation-dependent interaction between globotriose headgroups, and it is suggested that hydrogen-bond formation, directly or via bridging water molecules, is the molecular origin of these effects.

Place, publisher, year, edition, pages
2006. Vol. 22, no 24, 10038-10046 p.
Keyword [en]
Oligo(ethylene glycol), Packing density, Tension measurements, Wilhelmy plate technique
National Category
Chemical Sciences Physical Chemistry
URN: urn:nbn:se:kth:diva-24558DOI: 10.1021/la061857yISI: 000242022100035ScopusID: 2-s2.0-33846184082OAI: diva2:351782

QC 20150721

Available from: 2010-09-16 Created: 2010-09-16 Last updated: 2015-07-21Bibliographically approved

Open Access in DiVA

No full text

Other links

Publisher's full textScopus

Search in DiVA

By author/editor
Blomberg, EvaClaesson, Per Martin
By organisation
Surface Chemistry (closed 20081231)
In the same journal
Chemical SciencesPhysical Chemistry

Search outside of DiVA

GoogleGoogle Scholar
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

Altmetric score

Total: 39 hits
ReferencesLink to record
Permanent link

Direct link