Abstract: As a new kind of surfactant, amphipathic molecule Gemini is composed by two tradition surfactant connected by a spacer group.The self-assembly behavior of Gemini surfactant molecules in aqueous solutions, and the influences of ethanol on both the self-assembly structure and the critical micelle concentration (CMC) were investigated using dissipative particle dynamics (DPD) with a simple ball-spring model.Results show that as the concentration increases, the surfactant molecules self-assemble to form spherical, wormlike and layered micelles phase molecular packing.The addition of ethanol may enhance the solubility of hydrophobic groups of surfactant molecules in water and thus may inhibit the formation of micelles and increase the CMC of surfactant solutions.

Key words: As a new kind of surfactant, amphipathic molecule Gemini is composed by two tradition surfactant connected by a spacer group.The self-assembly behavior of Gemini surfactant molecules in aqueous solutions, and the influences of ethanol on both the self-assembly structure and the critical micelle concentration (CMC) were investigated using dissipative particle dynamics (DPD) with a simple ball-spring model.Results show that as the concentration increases, the surfactant molecules self-assemble to form spherical, wormlike and layered micelles phase molecular packing.The addition of ethanol may enhance the solubility of hydrophobic groups of surfactant molecules in water and thus may inhibit the formation of micelles and increase the CMC of surfactant solutions.