Mixed micelles of n-alkyltrimethylammonium bromides: influence of alkyl chain length

Synergism in mixtures of n-octyl-β-d-thioglucoside and different n-alkyltrimethylammonium bromides: effect of the alkyl chain length

“…One or another point was identified as the cmc value according to the criteria given in [24]. It is to be noted that the cmc values obtained in the case of pure surfactants, 8.70 mM for OTG, 15.14 mM for DTAB, 3.82 mM for TTAB, and 1.06 mM for CTAB, compare well with values previously reported by us and other groups [12,[24][25][26][27][28][29]. The behavior of a mixed system of surfactants is usually analyzed by phase separation model [30].…”

Unusual behavior of CMC for binary mixtures of alkyltrimethylammonium bromides: Dependence on chain length difference

“…Several workers have analyzed CMC data by Motomura's equation [8] which does take into account electro-neutrality but not the activity of the surfactant aggregate ion. The results reported for mixtures of alkyltrimethylammonium bromides give positive or negative values of the interaction parameter or excess Gibbs energy [9][10][11][12]. It is also reported that the interaction between surfactants is attractive for other homologous surfactants [9,13].…”

Mixed micelles of alkylamines and cetyltrimethylammonium chloride

“…We have chosen conductivity because it seemed one of the most straightforward techniques used due to its high sensitivity and reproducibility. In addition we can use a mathematical method to obtain a precise cmc value from the conductivityconcentration curves [21]. Break points in the specific conductivity versus molal concentration plots were taken to represent critical micelle concentrations (see Fig.…”

“…Although mixed micellar systems have been widely studied [10][11][12][13][14][15][16][17][18], mixtures of cationic surfactants have been less frequently examined and substantial deviations from their ideal behavior encountered [16,[19][20][21][22][23].…”