Effect of alcohols on the critical micelle concentration decrease in the aqueous sodium dodecyl sulfate solution

Effect of Pentanol Partitioning on Solubilization of Tetrachloroethylene and Gasoline by Sodium Dodecyl Sulfate Micelles

“…Beyond this point, pentanol partitions into the micellar inner core, where it should have little or no effect on surface charge but would increase the size of the micelle and thereby decrease conductance. It has also been shown that alcohols decrease the critical micelle concentration (CMC) of surfactant solutions and increase the aggregate number of the micelles (15,17,18,19). These latter effects should decrease the conductance but are apparently secondary to the effect on surface charge, as indicated by the increase in conductance up to interfacial saturation (Fig.…”

Adsorption of n-Aliphatic Alcohols from Dilute Aqueous Solutions on RNH3-Montmorillonites. III. Interlamellar Aggregation of the Adsorbate

“…Swarm building of nearly hexagonally packed alcohols around the cation and separation of these by 0.5 from the next pillar caused a reduction of the interaction with respect to pure liquid alcohol with a van der Waals interaction of 5.85 k J/mole CH2 (Lagaly and Weiss, 1970). In the systems H20-nRNH3C1 two different isotropic micellar solutions appear at different molar concentrations as shown in Table 2 of Nery et al, 1980. In the ternary systems H20-ionic surfactant-n-alcohol the critical micelle concentration (CMC) of the system H20-surfactant decreases by addition of n-alcohol as shown by hexanol for the system H20-C12H25NH3C1 (Herzfeld et al, 1950), by butanol for q2H25N(CH3)3Br-H20 (Guveli et al, 1979), and by n-alcohols in aqueous sodium dodecyl sulfate solution (SDS) (Hayase and Hayano, 1978). The last authors showed a linear decrease of the logarithm of CMC of SDS (mole fraction) as a function of the mole fraction of 1-alcohol in the aqueous phase.…”

“…The In CMC of the interlamellar RNH3+-cations as a function of the molar fraction of 1-alcohol in the aqueous phase is given in Figure 4, analogous to the treatment of Hayase and Hayano (1978). In comparison with their system water-SDS-alcohol a higher cation concentration was needed but a lower alcohol concentration for the aggregate formation.…”

Negative azeotropy in mixed adsorption of hexanol and dodecylammonium chloride at water/air interface

“…Adsorption and micelle formation of a surfactant in the presence of an alkanol have been studied from the viewpoint of the additive effect of the alkanol [1][2][3][4][5][6][7]. However, we have applied the thermodynamic treatment of surfactant mixture [8] to mixtures of alkanol and surfactant from the standpoint of mixed adsorption and micelle formation [9][10][11].…”