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- W2884146524 abstract "Italian physicist Carlo Marangoni published a treatise in 1865 which first described thespontaneous flow of a liquid film caused by gradients in surface t ension at a gas/liquidinterface. Such gradients are established by variations in surface concentration of molecularspecies which lower the surface tension in proportion to the interface concentration.While the dynamics and power law behavior of the initial circular advancing front in surfactantcoated films has been studied for about two decades, there has been relatively littlework conducted on characterizing the fractal spreading patterns which develop behind thisfront. In this thesis, we examine the dynamics of front propagation and subsequent fractalevolution in ultrathin liquid films of glycerol driven to spread by concentration gradientsin Aerosol OT, an insoluble anionic surfactant. We vary only the initial deposition volumeand concentration while maintaining the initial liquid film thickness at 2.5 microns.Contrary to theoretical analyses in the literature, our results reveal that the coefficientand exponent characterizing the advance of both the first front as well as the followingunstable front is not a constant depending only on geometry (i.e. rectilinear vs axisymmetricspreading) but varies with the initial surfactant concentration of the depositionvolume. Furthermore, the overall speed of the fronts is observed to increase with ambientrelative humidity, an effect we ascribe to a reduction in the viscosity of the glycerol filmclue to absorption of water from the ambient atmosphere. Only in cases of relatively highhumidity (higher than approximately 40% relative humidity) do we observe the formationof fractal patterns in the unstable front. Measurements of the fractal dimension yieldvalues in the range 1.45-1.65. The largest values approximate those fractal dimensionsobserved in systems undergoing diffusion driven aggregation or viscous fingering, neitherof which mechanism is pertinent to Marangoni flow." @default.
- W2884146524 created "2018-08-03" @default.
- W2884146524 creator A5032662453 @default.
- W2884146524 date "2014-01-01" @default.
- W2884146524 modified "2023-09-23" @default.
- W2884146524 title "Experimental Characterization of Front Propagation by Marangoni Forces in Ultrathin Liquid Films" @default.
- W2884146524 doi "https://doi.org/10.7907/3pam-kd07." @default.
- W2884146524 hasPublicationYear "2014" @default.
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