红外光谱研究以非离子型表面活性剂所组成微乳液的水结构

由烷基聚氧乙烯醚(AEO9)/正己醇/正十六烷/水所组成的微乳液,采用红外光谱对水内核的微观结构进行研究。以水分子的OH伸缩振动谱带, 由高斯分布曲线面积得出不同结构水的含量。只有少量水与表面活性剂结合, 另有部分水束缚于聚氧乙烯链段之间, 这些水与水相中的自由水呈动态平衡。当体系在剧烈振动后, 少量结合水转为束缚水, 静止后又恢复原状。

FT-IR spectroscopic studies on water structure in microemulsion with nonionic surfactant

The microstructral characteristics of water/AEO9/hexadecane/hexanol microemulsion have been investigated by FT- IR spectroscopy. The broad peaks obtained for water OH and the ethereous bands have been resolved by the Gaussian Curve fitting program and the peak intensity and peak area corresponding to each peak have been particularly analyzed. It has been observed that the aqueous core of the microemulsion droplet was composed of trapped and free water while a small amount of water remained bound in the interface. When the microemulsion is vigorously shaken, the trapped water will increase while bound water will decrease. That is because the water molecules on the surfactant surface have escaped.