In this study,two combinations of three surfactants,cocamidopropyl betaine with sodium methyl cocoyl taurate and sodium laureth sulfate,respectively,were systematically tested for surface tension and foam height performance at different ratios and concentrations to explore the correlation between the foam height and surface tension of surfactants,and to deeply discuss the concentration dependence and limitations of the Ross-Miles method when evaluating the foam performance of surfactants in personal cleaning products.The research results show that there is a close correlation between the foam height and the surface tension of surfactants,which provides an important reference for the formula design of amino acid surfactants and other types of surfactants;compared with the sodium laureth sulfate system,the test results of the conventional Ross-Miles foam meter in the amino acid surfactant system are even more unable to accurately reflect the actual application effect,and the error is more significant;and improvement suggestions are put forward for the application limitations of the Ross-Miles foam meter:it is recommended to adjust the test concentration to the actual use concentration to more accurately reflect the foam performance of surfactants in practical applications.
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