双十八烷基二甲基氯化铵水溶液的性质

Property of Aqueous Solution of Dioctadecyl Dimethyl Ammonium Chloride

采用动态光闪射、透射电子显微镜、流变仪等手段初步探讨了双十八烷基二甲基氯化铵(TA-100)水溶液内部胶束大小、形貌以及溶液的流变性质,借助偏光显微技术观察了TA-100表面活性剂形成的各相异性水溶液的液晶织构。研究发现,溶液中表面活性剂聚集体的平均粒径、溶液流变性质随表面活性剂的质量分数发生规律性变化,TA-100本身两个相对较长的疏水链导致其所形成的聚集体疏水作用较强,有利于进一步有序排列,从而导致较低表面活性剂质量分数下十字花纹理层状液晶的生成。

The size distribution and morphology of dioctadecyl dimethyl ammonium chloride（TA-100） aggregates in aqueous solution were studied by means of dynamic lightscattering（DLS）,transmission electron microscopy（TEM）,and rheology.Polarizing microscope（PLM） was used to observe the texture of anisotropic liquid crystal formed in TA-100 aqueous solution.The results show that the average size of surfactant aggregates and rheological property of aqueous solution varies with surfactant concentration.Two relatively long hydrophobic chains of TA-100 lead to strong hydrophobic interaction,and the corresponding lamellar liquid crystal generates at lower surfactant concentration.