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- W2737701355 abstract "Surface tension is one of the important physical properties in the multiphase process. Most of the surface tension measurements are obtained under static and stable condition. However, in the dilute aqueous solutions of surfactant, the surface tension may be affected by a rate of increasing in the liquid surface due to the absorption process of surfactants. In this study, we present a dynamic surface tension measurement, which uses a cyclical change in shape of a small droplet on a vertically vibrating plate, and showed an effect of frequency on the surface tension of aqueous surfactant liquids. The measurement system consists of following 3 steps, (1) prepare the droplet radial coordinates on a video frame at the lowest position of the vibrating plate, (2) calculate droplet radial coordinates by a numerical analysis at given parameters, and (3) optimizing the parameters used in the numerical analysis until both droplet shapes reach the same at a given tolerance. Because size of the droplet was small (about 2mm in diameter) and the droplet (including the contact-line) was nearly-stationary at the highest and lowest positions of the vibrating plate instantaneously, we applied stationary condition to the whole droplet at the lowest position. Therefore, the shape of axisymmetrical droplet can be calculated theoretically at given parameters (the apparent gravitational acceleration and surface tension to be optimized) and proper initial values (a mean curvature at the top of the droplet, the droplet height, and radius of a three-phase contact line of the droplet). This method was made for SDS, CTAB, and Triton-X100 aqueous solutions, respectively. The results showed that surface tension increased gradually as increasing in the frequency of the vibrating plate for the surfactant solutions, while the constant surface tension was observed for distilled water." @default.
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- W2737701355 date "2012-06-25" @default.
- W2737701355 modified "2023-09-24" @default.
- W2737701355 title "Surface tension measurement for water surfactant solutions using a small droplet on a vertically vibrating plate" @default.
- W2737701355 hasPublicationYear "2012" @default.
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