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The surface tensions of five different liquids water, glycerol, ethylene glycol, benzaldehyde and toluene, are measured at 25°C by using the pendant bubble shape technique at different bubble volumes. It is found that the surface tension measured is a function of the bubble volume: the larger the volume, the more accurate the tension. This phenomenon is simply due to the accuracy limit on the edge...
The idea that surfactants may have purely diffusive adsorption and mixed re-equilibration relaxations is verified experimentally in this study. Dynamic surface tension data of 1-decanol for both adsorption and desorption are compared with the theoretical tension profiles predicted by a phase transition model for the entire relaxation period. The fit is good. The adsorption of 1-decanol onto a clean...
Surfactants with strong cohesion can have purely diffusive adsorption and mixed re-equilibration relaxations. This idea is illustrated in this study by theoretical simulations of the relaxation in surface tension due to adsorption onto an initially clean planar interface and re-equilibration of an interface containing a monolayer which has been perturbed. A phase transition model is utilized to...
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