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Interaction between phosphine oxide surfactant layers adsorbed on hydrophobed Mica
YKI – Ytkemiska institutet.
1991 (English)In: Journal of Colloid and Interface Science, ISSN 0021-9797, E-ISSN 1095-7103, Vol. 143, 1-8 p.Article in journal (Refereed)
Abstract [en]

The surface force apparatus has been used to determine the interactions between hydrophobed mica surfaces immersed in aqueous solutions of the nonionic surfactant, dimethyldodecylphosphine oxide (DDPO) . The adsorption of surfactant on hydrophobic surfaces was studied at different concentrations. When a densely packed nonionic surfactant layer had adsorbed, the surface intetaction was measured as a function of temperature. Contact angles on hydrophobed mica sheets immersed in DDPO solutions were also recorded at different concentrations. The results show that strong, long-range hydrophobic attraction vanishes completely. In contrast, the adhesjion, as measured by the pull-off force, is substanially redused as soon as any polar groups are present on the hydrophobic surface. A repulsive hydration force is present between the nonionic DDPO head groups at short separations . There is an adhesive minimum between surfaces covered with DDPO monolayers. A temperature dependence of the interactions between the head groups was recorded and related to the temperature-induced phase separation present in the bulkDDpo.water system.

Place, publisher, year, edition, pages
1991. Vol. 143, 1-8 p.
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:ri:diva-26778OAI: oai:DiVA.org:ri-26778DiVA: diva2:1053781
Note
A686Available from: 2016-12-08 Created: 2016-12-08Bibliographically approved

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