Structure Effect on Miscibility of Butanol and Dodecyltrimethylammonium Chloride in Adsorbed Film

Miscibility of Hydrocarbon and Fluorocarbon Surfactants in Adsorbed Film and Micelle

“…±0.01 kJ mol −1 , the dependence of g H,E values on γ is significant. As described previously (21,(24)(25)(26)(27)(28) …”

Miscibility of Butanol and Cationic Surfactant in the Adsorbed Film and Micelle

“…Figure 3 shows the m vs X 2 curves at a given surface tension for the DAC systems and those of the DTAC systems are given in Ref. 22; m increases as X 2 decreases and the increment of m is large at the lower X 2 values. In addition, the m value increases more steeply in the TBA-DAC system than in the NBA-DAC system.…”

“…It should be recalled that the m vs X 2 H curves of the NBA-DTAC and TBA-DTAC systems deviate negatively from the ideal mixing lines (22). Considering our previous arguments on the correlation between the molecular interaction and the deviation of the total molality vs composition of adsorbed film curve from its ideal line (17)(18)(19)22), it is concluded that the molecular interaction between different species is weaker than that between the same species in the butanol-DAC systems and stronger in the butanol-DTAC systems. Here it is advantageous to remember that the phrase "molecular interaction" is employed in a thermodynamic sense so that it includes not only direct but also indirect interactions such as surfactant-surfactant, water-surfactant, and water-water interactions at given circumstances.…”

“…1. Those of the NBA-DTAC and TBA-DTAC systems are given elsewhere (22). The surface tension ␥ decreases rapidly as the total molality m increases and takes an almost constant value at high molalities.…”

“…NBA and TBA were prepared according to the procedure reported previously (22). DAC was obtained by neutralizing n-dodecylamine, which was distilled under reduced pressure (ca.…”