Facility for adsorption and surface tension studies (FAST) on board of shuttle STS-107 mission: Determination of the surface dilational modulus as a function of concentration and temperature for aqueous solutions of dodecyl-dimethyl-phosphine-oxide, in the 0.01–0.32 Hz frequency range
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Measurements of dynamic-surface-tension responses to harmonic surface perturbations, in the low-frequency range, are reported for aqueous solutions of n-dodecyl-dimethyl-phosphine-oxide. From the primary observed results of the steady-state surface oscillation behaviour, the inherent surface dilational modulus is determined at different frequencies, at various concentrations up to the critical micellar concentration and at three temperatures (i.e., at T=15, 25 and 35 °C). The obtained experimental values are successfully interpreted in terms of the diffusion-controlled model. The experiments grant reliable information about the constitutive dynamic properties of air-liquid single interfaces.
KeywordsCritical Micellar Concentration Dilational Elasticity Inherent Surface Equilibrium Thermodynamic Property Surface Tension Study
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