Of the newly developed surfactants, gemini surfactants consist of two hydrophobic chains and two hydrophilic groups covalently attached through a spacer. Gemini surfactants have superior performances over their corresponding conventional surfactants, such as much lower critical micelle concentration, higher efficiency in reducing surface tension, much easier forming into micelle, lower Krafft point, much better wetting ability and so on. Recently, gemini surfactants have become a hot topic of collo...