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The dependence of the dynamic surface tension of water at the interface with saturated hexane and cyclohexane vapours was measured by the drop profile analysis method. The surface tension for the adsorption layers of cyclohexane at different temperatures was compared with the results reported earlier for the adsorption of hexane and other alkanes from the vapour phase on water drops. It is shown that...
Surface tension and dilational viscoelasticity of solutions of various surfactants measured with bubble and drop profile analysis tensiometry are discussed. The study also includes experiments on the co-adsorption of surfactant molecules from a solution drop and alkane molecules from saturated alkane vapor phase. Using experimental data for 12 surfactants with different surface activities, it is shown...
A new set-up for studying the dynamic behaviour of soluble adsorption layers and insoluble monolayers is presented. The apparatus consists of a hydrophobic funnel and a counterbody. By moving the funnel through the liquid surface the surface area inside the funnel is expanded or compressed. The counterbody compensates for the liquid displaced by the funnel by moving in the direction opposite to the...
The MPT1 allows to determine the bubble dead time and to calculate the effective surface age of a bubble. The developed theory for describing adsorption processes at the surface of a growing bubble and useful approximate solutions of this theory give access to a quantitative interpretation of experiments. The standard version of the automated maximum bubble pressure tensiometer MPT1 has a time...
The dynamic surface tension of surfactant and polymer solutions can be measured by different experimental techniques, each of them having a specific time window, from the range of milliseconds up to seconds, minutes, and hours. In the present paper, the application is described of a new design of maximum bubble pressure instrument for measuring the dynamic surface tension of surfactant solutions in...
In the framework of the parametric method 3 quantum chemical approximation reasonable values are obtained for the thermo-dynamic characteristics of the cluster formation for the fatty alcohol series CnH2n+1OH (n = 8–16) with various structures at the air/water interface. The calculated values of the enthalpy, the entropy and the Gibbs energy for the formation of a definite cluster structure can be...
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