Pickering多重乳状液的一步法合成及形成机理研究  

Mechanism and Formation of Pickering-Type Multiple Emulsions Made by One Step Method

作　　者：王一平[1] 姚志良[1] 李彦超[1] 刘陈伟[1] 

机构地区：[1]中国石油大学(华东)石油工程学院,东营257000

出　　处：《化学学报》2011年第18期2130-2136,共7页Acta Chimica Sinica

摘　　要：使用锂皂石层状纳米颗粒与表面活性剂(Span80)复配制备乳状液的过程中,在乳化之前对锂皂石颗粒水分散体系进行稀释,则可以通过一步法制备出性能稳定的W/O/W型Pickering多重乳状液.研究了Span80浓度、锂皂石浓度以及稀释用水的量对生成乳状液的类型及稳定性的影响规律,对一步法合成Pickering多重乳状液的成因及机理进行了探讨和分析.实验结果表明,对锂皂石颗粒水分散体系的稀释是一步法合成稳定Pickering多重乳状液的关键因素,稀释用水的量决定了多重乳状液中的内水相体积.随着Span80浓度的增加,多重乳状液的粒径减小,稳定性迅速增加.锂皂石颗粒的浓度能够影响乳状液的类型,但对乳状液的稳定性以及乳状液的粒径影响不大.锂皂石颗粒在水分散体系中缓慢的扩散速率是一步法合成Pickering多重乳状液的主要原因.It was found that Pickering-type persistent multiple emulsions would be generated by one step method through mixing aqueous Laponite particle dispersion diluted with water before emulsification and oil solution containg Span80.The effect of Span80 concentration,Laponite concentration and water ratio on the stability of emulsions was studied.The formation and mechanism of Pickering-type persistent multiple emulsions by one step method were discussed.The experimental results showed that the dilution of Laponite particle suspension was the key factor of generating Pickering-type persistent multiple emulsions.The water ratio determined the inner water drop volume.With the increase of Span80 concentration,mean diameter of multiple emulsions decreased while stability increased greatly.Concentration of Laponite particles could impact the style of emulsions,but had little influence on the stability and diameter of emulsions.The lower diffusion rate of Laponite particles in water disperse system is the main reason of forming Pickering-type persistent multiple emulsions by one step method.

关 键 词：多重乳状液 一步法 锂皂石 SPAN80 

分 类 号：O648.23[理学—物理化学]