DEA与SDS/n-C5H11OH/H2O微乳液的相互作用

以循环伏安法研究了N,N-二乙基苯胺（DEA）与十二烷基硫酸钠（SDS）/正戊醇（n-C5H11OH）/H2O体系O/W和W/O结构微乳液的相互作用.结果表明,DEA在SDS/n-C5H11OH/H2O体系微乳液中有两种定位方式:其一,DEA分子在微乳液液滴膜相中定位于表面活性剂和助表面活性剂的极性基团附近;其二,DEA分子在微乳液液滴膜相中定位于表面活性剂疏水基团一侧.两种定位的分布与微乳液的结构和组成相关.

Interaction between N, N-diethylaniline and SDS/n-C5H11OH/H2O Microemulsion

The interaction between N, N-diethylaniline (DEA) and SDS/n-C5H11OH/H2O microemulsion was investigated by cyclic voltammetric method. DEA has two oxidation peaks in both O/W and W/O microemulsions, and the potential difference is only about 0.099 V between the two peaks ( Table 1, Fig.2).Since the energy needed for the radical cation DEA＋● losing an electron to form DEA2＋ is about 0.50 V (E(DEA /DEA＋●)－E(DEA＋●/DEA)≈0.50 V),the two peaks are both produced by DEA molecule losing an electron to form DEA＋●. The results indicate that DEA molecules can reside in the membrane phase of O/W and W/O microemulsion droplets with two ways. Some of them are located in the membrane phase of microemulsion near to the polar head of surfactant and cosurfactant, and others are located in the side of the hydrophobic tail of the surfactant. The distribution between the two locations depends on the structures and compositions of the microemulsions.