Surface-Tension Properties of Novel Phosphocholine-Based Fluorinated Surfactants

Surface- and interface-tension properties of novel fluorinated surfactants containing a phosphocholine group were studied using the Wilhelmy and spinning-drop methods. Using a conventional cationic fluorinated surfactant, we found that the values coming from the Wilhelmy method are not always accurate due to the effect of the wetting angle. The novel fluorinated surfactants show high surface activity not only in water but also in organic solvents such as m-xylene and methanol. They seem to be more effective in reducing the surface tension at low pH values. The novel fluorinated surfactants are also effective in reducing the interfacial tension between water and hydrocarbon oil.