【摘要】 利用X射线小角散射研究蔗糖酯溶液胶束结构随浓度的变化,在极稀蔗糖酯水溶液中,蔗糖酯在界面富集吸附形成单分子层,当表面吸附达到饱和时,蔗糖酯分子不能在表面继续富集,而憎水基的疏水作用仍竭力促使蔗糖酯分子逃离水环境,当蔗糖酯溶液浓度达到0.1%(g/mL)时,蔗糖酯分子则在溶液内部开始自聚,即疏水基在一起形成内核,亲水基朝外与水接触,形成最简单的胶团,即预胶束。当蔗糖酯浓度达到0.5%(g/mL)达到临界胶束浓度(CMC),蔗糖酯在水溶液中形成胶束。当蔗糖酯浓度进一步增加,蔗糖酯胶束在溶液中形成不规则层状结构,其不规则层状周期厚度L1=52.4nm,当蔗糖酯溶液浓度增加至5%(g/mL)时,蔗糖酯胶束排列成完整有序的层状,形成溶致液晶结构,其周期层状结构厚度L2=39.3nm,同时溶液体系中溶剂和溶质分子间存在微密度电子起伏。更多还原

【Abstract】 The research is focused on sucrose ester solution micelle structure changes with concentration by small Angle X-ray scattering.In extremely dilute sucrose ester aqueous solution,sucrose ester adsorbs on the interface and forms a single molecule layer.After reaching saturation,sucrose ester molecules are not further gathered,but the hydrophobic interaction of hydrophobic groups was prompt sucrose ester molecules away from water.When the concentration of sucrose ester solution is 0.1%(g/mL),sucrose ester molecules starts self-polymerization inside the solution,where hydrophobic groups aggregate into a core and hydrophilic groups outwards contact with water to form a simplest micelle.When the concentration of sucrose ester solution gets to 0.5 %(g/mL)which is the critical micelle concentration(CMC),sucrose ester forms micelle in the aqueous solution.When the concentration of sucrose ester raised higher,sucrose ester micelle in solution forms irregular layered structure,the thickness of irregular layer cycle(L1)is 52.4 nm.When the concentration of sucrose ester increases to 5%(g/mL),sucrose ester micelle arranges a completed and orderly layer,forming lyotropic liquid crystal,with the periodic layer thickness(L2)of 39.3nm.Micro electronic rolling between the solvent and solute molecules is also found existed.更多还原