含离子液体的复配表面活性剂微乳液的电导性质

研究了CTAB和TritionX-100复配表面活性剂在氯仿作为溶剂时,增溶离子液体bmimBF(IL)时所形成非水微乳液的电导性质,并且与含水体系的微乳液作了比较,发现两者存在较大的差别.在非水微乳液中,随着离子液体质量分数的增加,体系经历了IL/O型微乳液、双连续相、O/IL微乳液三种状态,并且采用循环伏安法对此结论进行了验证.两种表面活性剂复配后,在IL/O型微乳液阶段电导率随着CTAB的摩尔分数(α)增大而增大,在双连续相和O/IL微乳液阶段,体系的电导率随着α增大而减小.在含水微乳液中,只出现O/W型微乳液,而且随着增溶水质量分数的增加电导率下降.增溶水量一定的情况下,电导率随着α值增大而增大.

Conductivity Properties of Mixed Surfactants Microemulsions with Ionic Liquids

The conductivity properties of non-aqueous microemulsion systems formed by dissolving the ionic liquid(IL) 1-butyl-3-methylimidazlium tetrafluoroborate(bmimBF4) in chloroform with CTAB and TritionX-100 as mixed surfactants were investigated and compared with that of aqueous microemulsion system.It was found that there is great difference between the two systems investigated.In the non-aqueous microemulsion system,three types of microemulsion systems,such as the bmimBF4-in-chloroform type(IL/O),bicontinuous type,and chloroform-in-bmimBF4 type(O/IL),are formed respectively with the increase of IL weight fraction.The above result was further identified by the electrochemical cyclic voltammetry experiments conducted.When the mixed surfactants of CTAB and TritionX-100 were used,with the increase of molar fraction of CTAB(α),the conductivity values of the microemulsions increase when the system is in the IL/O type,while decrease respectively when the system is in the bicontinuous and O/IL type.In the aqueous system,only the O/W microemulsion is formed,and the conductivity values of the aqueous microemulsion system decrease with the increase of the weight fraction of water and increase with the increase of when the amount of water solubilization keeps constant.