The Synthesis and Aggregate Behaviors of A Novel Surfactant

The pH-sensitive anionic surfactant has been synthesized and its aggregate behaviors in the aqueous solution have been studied at different pH value. At higher pH value, the anionic surfactant will be fully de-protonated as a divalent molecule and generate higher curve aggregate, micelle. At lower pH value, the anionic surfactant will gradually be protonated and generate lower curve aggregate, vesicle or acid soap precipitate. The driving force that dominates their packing behaviors is hydrogen bonding generated from adjacent partial protonated surfactants.he cationic fluorescent surfactant has been synthesized and its aggregate behaviors in the aqueous solution have been studied by fluorescence measurements owing to its intrinsic fluorescent probe. When surfactant concentrations increase above the critical micelle concentration (CMC), the emission wavelength would red shift because of excimer formation. Furthermore, the emission wavelength will not only shift to shorter wavelength but also increase quantum efficiency in less polar medium owing to the de-formation of aggregate. Similarly, the addition of anionic surfactant sodium dodecyl sulfate into the surfactant solution at different ratio also gives rise to the blue-shift wavelength and the increase of quantum efficiency.