CO_2触发型可逆微乳液的制备及性能研究

Study on preparation and properties of CO_2-responsive reversible microemulsion

以N,N-二甲基环己胺为油相,十二烷基硫酸钠(SDS)为表面活性剂,正丁醇为助表面活性剂制备了一种CO_2触发型可逆微乳体系。研究了微乳的微观结构,并考察了盐浓度、温度、SDS/正丁醇质量比对微乳相行为的影响。实验结果表明,原微乳体系的电导率和粒径分别为10.44 m S/cm和(2.70±0.03)nm;经CO_2/N_2交替刺激下微乳体系的电导率和粒径分别为13.17 m S/cm和(1.50±0.07)nm,制备的微乳体系具有可逆切换性能。随含水率增加,微乳由油包水型向双连续型再到水包油型微乳转变;盐浓度增加微乳区面积减小,微乳稳定性减弱;但温度对微乳稳定性无显著影响;当SDS/正丁醇质量比为1∶1时,微乳区面积最大。

A CO2-responsive reversible microemulsion system was prepared with N,Ndimethylcyclohexylamine as oil phase,sodium dodecyl sulfate（SDS） as surfactant and n-butanol as co-surfactant. The microstructure of the microemulsion was studied,and effects of salt concentration,temperature,mass ratio of SDS/n-butanol on the phase behaviors of the microemulsion were investigated. Experimental results showed that the conductivity and the particle size of the original microemulsion were 10.44 m S/cm and（2.70±0.03） nm,respectively,and the conductivity and the particle size of the microemulsion system under CO2/N2 alternating stimulation were 13.17 m S/cm and（1.50±0.07） nm,respectively,which indicated that the prepared microemulsion system had reversible switching property. The microemulsion changed from water-in-oil microemulsion to bicontinuous microemulsion and then to oil-in-water microemulsion with increasing water content. The area of the microemulsion was decreased and the stability of the microemulsion was weakened with increasing salt concentration. However,the temperature had no significant influence on the stability of the microemulsion. The maximum area of the microemulsion could be achieved when the mass ratio of SDS/n-butanol was 1∶1.