Synergism
The existence of synergism in a system containing two surfactants depends on several factors including interactions between the different components in the mixed micelles (β parameter), and relevant properties of the surfactants in the different phases (at the interface or in micelles). Synergism at the interface has two consequences, i.e. surface tension reduction efficiency, and surface tension effectiveness [17].
In the synergism of surface tension reduction efficiency (when the mixed system concentration reduces the surface tension of the solvent to a given value which is lower than the concentration of any individual surfactant), two conditions have to exist: (a) βσ must be negative, (b) |ln(Cσ1/Cσ2)||ln(C1σ/C2σ)| [26]. It is clear from the data in Table 4 that the C5–CTAB mixed system has no synergism in surface tension reduction. C10–CTAB binary systems exhibit surface tension reduction synergism at initial mole fractions of 0.5, 0.7 and 0.9. While lower mole fractions have not. On the other hand, synergism in the mixed micellar phase is presented when the CMCmix is lower than that of the individual surfactants, and |βm|>|ln(Cm1/Cm2)||βm|>|ln(C1m/C2m)| . It is apparent from the data in Table 4 that the C5–CTAB mixed system has no synergism in the mixed micellar phase. The mixed system of C10–CTAB exhibited micellar phase synergism at initial mole fractions higher than 0.2.
SynergismThe existence of synergism in a system containing two surfactants depends on several factors including interactions between the different components in the mixed micelles (β parameter), and relevant properties of the surfactants in the different phases (at the interface or in micelles). Synergism at the interface has two consequences, i.e. surface tension reduction efficiency, and surface tension effectiveness [17].In the synergism of surface tension reduction efficiency (when the mixed system concentration reduces the surface tension of the solvent to a given value which is lower than the concentration of any individual surfactant), two conditions have to exist: (a) βσ must be negative, (b) |ln(Cσ1/Cσ2)||ln(C1σ/C2σ)| [26]. It is clear from the data in Table 4 that the C5–CTAB mixed system has no synergism in surface tension reduction. C10–CTAB binary systems exhibit surface tension reduction synergism at initial mole fractions of 0.5, 0.7 and 0.9. While lower mole fractions have not. On the other hand, synergism in the mixed micellar phase is presented when the CMCmix is lower than that of the individual surfactants, and |βm|>|ln(Cm1/Cm2)||βm|>|ln(C1m/C2m)| . It is apparent from the data in Table 4 that the C5–CTAB mixed system has no synergism in the mixed micellar phase. The mixed system of C10–CTAB exhibited micellar phase synergism at initial mole fractions higher than 0.2.
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