脉冲回波法研究微乳液体系的稳定性

Applications of pulse echo measurement in the studies of Emulsions-system Stability

本文主要以正庚烷(C7H16)、水乳浊液(以span-80为表面活性剂)为模型体系,研究了脉冲回波法探测微乳体系结构稳定性的可能性,并进行了初步讨论。实验结果表明,超声衰减系数(α)与微乳体系配比、表面活性剂含量及微乳液制备时搅拌转速密切相关。微乳液体系在实验当中均出现了由油和水两相混合的状态到油和水分相的状态。微乳液体系的超声衰减系数在分相前后均保持着相对平稳的变化,但对应于不同条件下制备的溶液,分相时间都有所不同。且一般而言,当微乳液开始两相(水相和油相)分离时,超声衰减系数将发生明显变化。因此预计脉冲回波法有可能发展成为一种简单、可靠、非破坏性的微乳体系稳定性检测新方法。

To discuss the probabihty of pulse echo measurement （PEM） in the detection of the structure of emulsious, treating the emulsions of C7H16and H2O as the model. The results of the experiments showed that the ultrasonic attenuation（α） is greatly rented to the proportion of the emulsion - system, the content of the span - 80 and the rotation velocity when preparing the emulsions. In the experiments, the slate of emulsions varies from water- in - oil phase to water phase and oil phase. The change of the ultrasonic attenuation（α） keeps smooth when it is before or after the change of phase; but split- phase time varies with emulsions prepared in different conditions. And generally speaking, the ultrasonic attenuation will vary obviously when the emulsions begin to separate from each other. It is estimated that PEM might become an easy, reliable, undamaged, new method of detection of Emulsions - system stability.