摘要
用Langmuir膜天平测定了双头基四疏水链的季铵盐Gemini表面活性剂2C12-8-2C12·2Br和羧酸型Gemini表面活性剂c11pPHCOOH在气／液界面的表面压(π)-每个分子平均占据面积(A)的等温线,考察了压缩模量(ε)、过剩面积(△AE)、过剩自由能(△GE)等热力学参数随混合体系组成的变化。结果表明,纯组分体系和混合体系均形成液相扩展态单分子膜,混合体系的组成显著影响气／液单分子膜的性质以及组成膜的分子之间的相互作用。
The mixed monolayer at the air/water interface of two Gemini surfactants C11pHCOOH and 2C12-8-2C12·2Br mixture was studied using Langmuir balance technique. The surface pressure -area (π-A) isotherms of the mixed monolayer as well as the change of the compression modulus (ω) , the excess area (△AE) and the excess energy (△GE) with the mole fraction of C11pHCOOH in the mixed system were investigated. The results showed that the films formed with either the individual Gemini surfactants or their mixture displayed a character of liquid-expansion. The composition of the mixed monolayer affected significantly the properties of the film as well as the interaction between molecules in the mixed monolayer.
出处
《精细化工》
EI
CAS
CSCD
北大核心
2005年第z1期134-136,共3页
Fine Chemicals
基金
国家自然科学基金资助项目(20173010)~~
