期刊
COLLOID AND POLYMER SCIENCE
卷 287, 期 7, 页码 839-846出版社
SPRINGER
DOI: 10.1007/s00396-009-2038-8
关键词
Gemini surfactant; Self-assembly; Salt effect
资金
- National Natural Science Foundation of China [20673021]
- Professional Foundation of FZU [XRC-0639, 2008-XY-5]
The effects of NaBr on the adsorption of alkanediyl-bis-(dimethyl dodecyl-ammonium bromide) ( referred to as C-12-s-C-12 2Br) at the air/water interface and on the micellization in the solution have been investigated by surface tension and fluorescence techniques. The results showed that the addition of NaBr greatly enhances their efficiency and effectiveness in surface tension reduction as well as the ability of micellization, even induces strong premicellar aggregation before the cmc. These were attributed to the unique molecular structure of gemini surfactant, where the flexible polymethylene chain was the spacer linking the two quaternary ammonium heads. By a short spacer, the charges of the two quaternary ammonium head groups are concentrated. Even for a long spacer (s=12), since it is bent toward the alkyl tails, the similar effect is also produced. This results in the high sensitivity of their ionic head groups to salt. Besides, the addition of salt also effectively promotes the hydrophobic
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