黄原胶存在时十四烷基甜菜碱的聚集行为  

The Aggregation Behavior of Tetradecylbetane in the Presence of Xanthan

作　　者：陈爱民[1] 徐桂英[1] 杨延莲[1] 张莉[1] 沈强[1] 

机构地区：[1]山东大学胶体与界面化学教育部重点实验室,山东济南250100

出　　处：《日用化学工业》2001年第1期1-4,共4页China Surfactant Detergent & Cosmetics

基　　金：国家自然科学基金!资助项目 (2 99730 2 3)

摘　　要：通过表面张力和稳态荧光光谱的测定 ,探讨了黄原胶 (XC)存在时十四烷基甜菜碱 (C14 BE)的聚集作用。结果表明 ,少量XC存在时 ,有利于C14 BE在溶液表面上聚集 ,从而提高了C14 BE降低水表面张力的效率。XC含量较大时 ,C14 BE与XC在 [C14 BE] <cmc时即开始聚集成复合物 ;C14 BE胶束平均聚集数N随XC含量增大而减小 ,但[C14 BE] =0 0 1mol·dm-3,疏水因子I1/I3 随XC含量增大没有发生明显变化。这些现象归因于XC与C14 BE分子通过两者的极性基团发生相互作用。The aggregation behavior of tetradecylbetane(C_14BE)in the presence of Xanthan (XC) has been investigated by methods of surface tension and fluorescentce probe techniques.The results indicate that the surface activity was enhanced in the presence of XC when the [C_14BE]<cmc.But the mean aggregation number N of C_14BE micelles decreases when the concentration of XC increased and the 'hydrophobic index',I_1/I_3,was not decreased when the [C_14BE]=0.01mol·dm^-3.This most likely due to the interaction between the molecules of XC and C_14BE.The C_14BE-XC aggregates are formed at a critical aggregation concentration(cac),which is lower than the cmc of C_14BE solution.It is shown that the aggregation of C_14BE molecules is easier in the presence of XC.

关 键 词：黄原胶 十四烷基甜菜碱 疏水因子 平均聚集数 临界聚集浓度 两性表面活性剂 

分 类 号：TQ423.3[化学工程]