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中文摘要：
为研究不同结构的表面活性剂分子在溶液中胶束化能力的差异,采用分子动力学方法模拟三种烷基芳基磺酸盐在真空和水溶液环境下的结构与相互作用.利用自由能微扰（FEP）方法计算了水合自由能,发现与用传统热力学表面张力法测定自制的烷基芳基磺酸盐结果一致.研究表明：烷基芳基磺酸盐在水溶液中的胶束化过程是自发进行的,随着分子结构中芳环向长烷基链中间位置移动,胶束化能力和胶束稳定性均下降;疏水基周围水分子的＂冰山结构＂会影响胶束的稳定性,而水分子中氢键的生存周期是反映冰山结构变化的重要指标;同时,亲水基与水分子间形成氢键的数目会增强或减弱分子脱离胶束体的趋势,从而影响胶束结构的稳定性.
英文摘要：
To investigate the influence of surfactant molecular structure on micellization in solution,we used molecular dynamics to simulate the molecular structure and interaction of three alkyl aryl sulfonates in vacuum and in solution.The solvation free energy was calculated from the free energy perturbation （FEP） method and the obtained result was consistent with that obtained using the surface tension method.Research has shown that the micellization of alkyl aryl sulfonates in an aqueous solution is a spontaneous process as the aromatic ring shifts from the edge to the center of long carbonic chains,which results in a decrease in the ability of micelles to form and a decrease in their stability.Changes in the ＂iceberg structure＂ around the hydrophobic groups and the water molecules may affect the stability of the micelles and we studied the ＂iceberg structure＂ by considering the lifetime of the hydrogen bonds.Additionally,we find that the number of hydrogen bonds between the hydrophilic groups of the alkyl aryl sulfonates and the water molecules can affect the decomposition and stability of the micelles.
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