酸性模拟油的油水界面扩张粘弹性研究

考察了不同链长脂肪酸模拟油的扩张模量随扩张频率的变化规律,研究了碱和十二烷基磺酸钠对酸性模拟油界面扩张性质的影响.结果表明,不同脂肪酸模拟油的扩张模量随扩张频率和碳链长度的增加而增大.水相中加入十二烷基磺酸钠对酸性模拟油的扩张模量影响不大,对低工作频率下相角影响较大.无论有无十二烷基磺酸钠,水相中加入NaOH的浓度较低时酸性模拟油的扩张模量变化不大;NaOH浓度较高时,酸性模拟油的界面扩张模量增加,慢弛豫过程在界面上起主要作用,此时界面上可能形成了特殊结构.

Studies on Interfacial Dilational Viscoelasticity Properties of Acidic Simulated Oil/Alkali-surfactant System

The dilational viscoelasticity properties of the interface between fatty acid simulated oil and water and the effect of alkali and sodium dodecylsulfonate on the dilational properties of the interface of fatty acid simulated oil were studied. It is shown that their dilational modulus increased with the increases of the dilational frequency and carbon chain length. When sodium dodecylsulfonate was added to the aqueous phase, the dilational modulus hardly changed; but the phase angle changed sharply when the work frequency was low. When the concentration of sodium hydroxide added to the water phase was low, whether sodium dodecylsulfonate existed or not, the dilational modulus did not change obviously. When the concentration of sodium hydroxide was high, the dilational modulus enhanced remarkably, and the slow relaxation process plays an important role, thus a special structure might be formed.