Monte Carlo Simulation on Adsorption of Nonionic Gemini Surfactant at Solid-Liquid Interfaces

The adsorption of nonionic Gemini surfactant at solid-liquid interfaces was studied by Monte Carlo simulation. The thickness of adsorption layer, the amount of adsorption, and the segment density distribution were obtained, and adsorption isotherms were fitted using twostep adsorption model. In addition, simulation of competitive adsorption was studied using Gemini surfactant and traditional surfactant. Results show that at hydrophobic interfaces the thickness of adsorption layer decreases, adsorption amount declines with the increase of temperature, and the adsorption isotherm fits two-step adsorption model well. The adsorption ability of Gemini is better than that of traditional surfactant at the same energy parameters, and Gemini can replace traditional surfactant from the surface and thus influences the property of interface.