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• W2980580125 startingPage "14180" @default.
• W2980580125 abstract "Surface diffusion is an important mass transfer mechanism of surfactant molecules within adsorbed layers, which has to be taken into account in many fluid dynamics problems. Although considerable research has been devoted to studying the thermodynamic and rheological properties of surface films, rather less attention has been paid to surface diffusivity measurements. Current measurement methods, which are based on marking part of surfactant molecules in uniform motionless layers with the radiotracer or fluorescence technique, are well suited for use in quite condensed layers, but they do not work in rarefied layers due to increasing contribution of density fluctuations at an interface. In this study, we propose a method for measuring the surface diffusion coefficient in gaseous monolayers of an insoluble surfactant under dynamic conditions, i.e., in the presence of a flow at an interface. Our approach is based on measuring the velocity of thermocapillary flow on the water surface, which contains molecules of an insoluble surfactant. We show that under conditions of the balance between thermo- and solutocapillary tangential stresses the convective motion exists at an interface, which is caused by a blurring of the surface concentration gradient of surfactant molecules due to the surface diffusion mechanism. For calculations of the surface diffusion coefficient, we use the equation proposed earlier in the theoretical study [ Homsy , G. M. ; et al.J. Fluid Mech. 1984 139 , 443 - 459 ]. The surface diffusion coefficient measured by us in gaseous layers is 2-3 orders of magnitude larger than the results for liquid-expanded and liquid-condensed layers obtained by other researchers. Finally, we compare the obtained results with the known measurements of surface diffusion and discuss the limitations of the proposed method." @default.
• W2980580125 created "2019-10-25" @default.
• W2980580125 creator A5059738749 @default.
• W2980580125 creator A5087950895 @default.
• W2980580125 date "2019-10-16" @default.
• W2980580125 modified "2023-10-18" @default.
• W2980580125 title "Surface Diffusion in Gaseous Monolayers of an Insoluble Surfactant" @default.
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• W2980580125 doi "https://doi.org/10.1021/acs.langmuir.9b02156" @default.
• W2980580125 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/31618037" @default.
• W2980580125 hasPublicationYear "2019" @default.
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