Span 80-癸烷-D_2EHPA-H_2O液膜体系的界面膜扩张黏弹性研究  

Study on dilational viscoelasticities of interfacial film of Span80-decane-D_2EHPA-H_2O emulsion liquid membrane system

作　　者：姚盛宇 蒋其辉 龚福忠[1] 廖孙启[1] 

机构地区：[1]广西大学化学化工学院,南宁530004

出　　处：《中国科技论文》2016年第6期619-623,共5页China Sciencepaper

基　　金：国家自然科学基金资助项目(20966001)

摘　　要：为探讨以Span 80(失水山梨醇单油酸酯)为乳化剂所制备的乳化液膜体系的稳定机理,采用小幅低频振荡法考察了扰动频率、Span 80浓度、温度、萃取剂D_2EHPA(二-(2-乙基己基)磷酸)对Span 80-癸烷-D_2EHPA-H_2O液膜体系油/水界面膜扩张黏弹性的影响,同时利用基于光散射原理的TURBISCAN Lab expert型稳定性仪测定了乳液的稳定性,讨论了界面膜扩张黏弹性与乳液稳定性的关系。研究结果表明:Span 80-癸烷-H_2O乳液的界面膜(即Span 80单分子膜)是一种弹性膜,其弹性模量εr随着扰动频率的增大而增大,随Span 80浓度的增大而增大,但随温度的升高而减小;D_2EHPA在癸烷/H_2O界面与Span 80的竞争吸附使界面膜的εr减小。界面膜的εr越大,乳液体系就越稳定,反之亦然,较高的Span80浓度和较低的温度有利于增大界面膜的εr,因此有利于提高乳液体系的稳定性。To understand the stability mechanism of emulsion liquid membrane system （ELMs） which was prepared by using Span 80 （Sorbitan oleate） as emulsifier, the dilational viscoelasticity of oil/water interfacial film of Span 80-decane-D2EHPA-H2〇 ELMs （D2EHPA = di（2-ethylhexly）phosphoric acid） were studied by means of oscillating barriers method. The major effect fac-tors such as perturbation frequency, Span 80 concentration, temperature and D2EHPA on dilational viscoelasticity were also in-vestigated. Meanwhile, the stability of Span 80-decane-H2O emulsion was detected by using Turbiscan？ LAB instrument based on the principle of multiple light scattering, and the relationship between dilational viscoelasticity and emulsionstability was also discussed. The results show that the interface film （i. e. Span 80 monolayer） of emulsion system is an elastic membrane, and its dilational elasticity ervalue increases with the increasing of perturbation frequency and Span 80 concentration, but decreases with the increasing of temperature. The competitive adsorption between E^EHPA and Span 80 at decane/H2〇 interface results in a decreases of ervalue. The greater the er value, the better the stability of emulsion, and higher Span 80 concentration and lower tem-perature are helpful to increase er, thus to improve the stability of the emulsion.

关 键 词：SPAN 80 乳液 界面膜 扩张黏弹性 稳定性 

分 类 号：O648.23[理学—物理化学]