文摘
Densities (d) and sound velocities (v) of an ethoxylated alkyl phenol surfactant in aqueous solutions of two amino acids, namely glycine and leucine, have been measured over a temperature range of 25-0?°C at intervals of 5?°C by using density and sound analyzers. Experimental data have been used to calculate the isentropic compressibilities (κ s ), apparent molar volumes (? v ) and apparent molar adiabatic compressions (? κ ) in order to explain amino acid–surfactant interactions. The results have been discussed in terms of the effect of amino acids on the micellization behavior of the surfactant. A comparative study of both the amino acids has been carried out and is found that both amino acids produce a decrease in the CMC value of nonionic surfactant but to different extents.