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- W2026854548 abstract "The surface force apparatus has been used to determine the interactions between two 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 interaction 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 persists, even when some nonionic surfactant is adsorbed on the hydrophobic surfaces. The molecules are lying down on the mica surfaces at these concentrations. However, when a densely packed monolayer of nonionic surfactant has formed on the hydrophobic surface, the hydrophobic attraction vanishes completely. In contrast, the adhesion, as measured by the pull-off force, is substantially reduced 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 bulk DDPO-water system." @default.
- W2026854548 created "2016-06-24" @default.
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- W2026854548 date "1991-04-01" @default.
- W2026854548 modified "2023-10-16" @default.
- W2026854548 title "Interaction between phosphine oxide surfactant layers adsorbed on hydrophobed mica" @default.
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- W2026854548 doi "https://doi.org/10.1016/0021-9797(91)90432-8" @default.
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