Study on Colloid Vibration Current in Aqueous Solution of Binary Surfactant Mixtures: Effects of Counterions and Hydrophobic Chains

Effect of Hydrophobic Chains on Solubilization of Hydrocarbon and Fluorocarbon Surfactant Mixtures in Aqueous Solution

“…Considering the results of the mixed micelles in the previous study 14,15 and the solubilization behavior of aqueous LiDS and LiFOS solutions in the present study, it was expected that solubilization would be observed at X LiFOS 0.46 and would be barely observed at X LiFOS 0.46, i.e. an abrupt change in absorbance at X LiFOS 0.46 was predicted.…”

“…Figure 1 shows the concentration dependence of the absorbance of Sudan III solubilized in aqueous LiDS and LiFOS solutions. In the LiDS system, the absorbance in-creased with increasing concentration over 8 mM, which is near to the cmc of LiDS in aqueous solution 15 . On the other hand, the absorbance of the LiFOS system did not change with increasing concentration.…”

“…This is due to the low miscibility of hydrocarbon and fluorocarbon compounds. It is also known that micelle formation in hydrocarbon and fluorocarbon surfactant mixtures show specific behavior as described later 14,15 . By combining these approaches, the controlled release of materials can be achieved.…”

“…It is well known that mixed micelles of hydrocarbon and fluorocarbon surfactants show unique behavior. When one is added to an aqueous solution of the other in an LiDS and LiFOS mixture, their cmc values increase 14,15 . This means that the addition of LiFOS into an aqueous LiDS solution prevents the formation of mixed micelles, and vice versa.…”

“…2 in Ref. 15, which are presented in Table 1. It is clear that the micelle composition drastically changed at X LiFOS 0.46, but the solubilization behavior barely changed at this point, although Sudan III was not solubilized at X LiFOS 0.7.…”