Surface tension and dilational viscoelasticity of water in the presence of surfactants Tyloxapol and Triton X-100 with cetyl trimethylammonium Bromide (CTAB) at 25 degrees C are investigated. The results show that there is synergistic behavior in both the mixtures at higher mole fraction of nonionic surfactant. According to the Rubingh and Rosen theory, the results predict nonideal mixing and attractive interaction between the constituent surfactants in the mixed micelle and layer. By using the Maeda theory, the results suggest the chain-chain interaction among surfactants does not seem to be high. The surface dilational viscoelasticity results show that the Tyloxapol adsorption layer has the highest dilational modulus vertical bar epsilon vertical bar value among three single surfactants. Also, it indicates the vertical bar epsilon vertical bar maximum values of surfactant mixtures are usually between that of the single surfactant. Moreover, it is worth noting that the vertical bar epsilon vertical bar maximum values of Tyloxapol/CTAB mixtures are always higher than those of TX-100/CTAB ones.