Abstract
Two kinds of equations of the surface tension vs the concentration for ideal binary mixtures of surfactants were acquired with Newton iterative method. The accuracy could be verified by comparison among the values obtained respectively from the iterative, the numerical and observable approaches for surface tension of the ideal binary mixed homology systems C12H25PO(CH3)2/C10H21PO(CH3)2, C12H25(CH3)3NBr/C16H33(CH3)3NBr in aqueous solutions (25 ℃), C8F15O2NH4/C9F17O2NH4 in 0.1 mol·L-1 ammonium chloride solution (25 ℃). The results indicated that the astringency velocity of the two kinds of iterative methods was very fast and the relative error of expression was below 1%.
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