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运用傅立叶变换红外光谱（FT－IR）对水／琥珀酸（乙基已基）磺酸钠（AOT）／正庚烷微乳体系中磺酸根的水化作用进行了研究．由于微乳体系中水分子与表面活性剂分子的相互作用，S＝O对称伸缩振动的红外吸收峰向低频方向移动．体系中的加水量W0（水与AOT的摩尔比）由0.5增大至25时，磺酸根对称伸缩振动的红外吸收峰由1051．39cm－1向低频移动至1046．15cm－1．同时，由于Na+的不对称作用，AOT分子中磺酸根反对称伸缩振动分裂成两个吸收峰，分别位于正215cm-1及1245cm－1附近，两个劈裂峰的距离及各自的峰面积均随体系中加水量的变化而变化，应用二阶导数、傅立叶退卷积及曲线拟会等分辨率增强技术可更清楚地反映出这个二重峰的变化情况．固体AOT分子中碳酸根反对称伸缩振动分裂的两个峰之间频率的差值约为42cm－1，形成微乳液以后，这两个峰的差值变小，W0为20时，这两个峰频率的差值逐渐减小到29cm-1，这些变化与磺酸根的水化程度直接相关
The hydration of sulfonate in aqueous / succinic acid (ethylhexyl) sulfonic acid (AOT) / n-heptane microemulsion system was studied by Fourier transform infrared spectroscopy (FT-IR). Due to the interaction of water molecules and surfactant molecules in the microemulsion system, the infrared absorption peak of S = O symmetric stretching vibration moves to the lower frequency. When W0 (molar ratio of water to AOT) increased from 0.5 to 25, the infrared absorption peak of sulfonate symmetric stretching vibration moved from 1051.39cm-1 to 1046.15cm-1 at low frequency. At the same time, due to the asymmetric action of Na +, the antisymmetric stretching vibration of the sulfonate group in AOT molecule splits into two absorption peaks at positions of positive 215cm-1 and 1245cm-1, respectively, and the distance between the two splitting peaks and their respective peak areas With the change of water quantity in the system, the change of this doublet can be more clearly reflected by using second-derivative, Fourier deconvolution, and curve fitting. The difference between the two peaks of the antisymmetric stretching vibration of carbonate in the solid AOT molecule is about 42cm-1. After the formation of the microemulsion, the difference between these two peaks becomes smaller. When W0 is 20, the two peaks The frequency difference gradually decreases to 29cm-1, and these changes are directly related to the degree of sulfonate hydration