Surface tensions, densities, and speeds of sound for aqueous solutions of lauryl ether ethoxylates
作者： José Luis López-Cervantes , Jesús Gracia-Fadrique , Encina Calvo , Alfredo Amigo
DOI: 10.1016/J.FLUID.2013.07.031
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摘要: Abstract Surface tensions for aqueous solutions of lauryl ether ethoxylates at the temperature 298.15 K were measured using a Lauda drop volume tensiometer. The non-ionic surfactants analyzed in this work polyoxyethylene 9 (polidocanol) and 4 (brij 30). surface tension values used to determine critical micelle concentrations (CMC) surfactant as well calculate infinite dilution activity coefficient following two different models: first one combines Volmer equation state Gibbs adsorption equation, second is group contribution model that takes into account mass spectra surfactants. Density sound velocity measurements above CMC wide range also determined with aim analyze aggregate structure these ethoxylates. Van der Waals was behavior solutions.
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