| wo experiments have been performed in which surface light scattering and a mechanically generated capillary wave technique have been used to study the interface between two liquids. In the first experiment, surface light scattering was used to obtain quantitative values of the effective surface tension between two miscible liquids were obtained as a function of time. The system studied was a near-critical binary liquid mixture of isobutyric acid and water (IBW), originally at two-phase equilibrium slightly below its critical temperature ;In the second experiment, films of polystyrene-b-poly(methacrylic acid) (PS-PMAA) diblock copolymer were studied at the toluene/water interface. Values for the surface film mechanical parameters (surface tension and transverse viscosity) were obtained as a function of the overall diblock molecular weight... |
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