C_(12)-2-C_(12)·2Br/正己醇/正庚烷/水微乳体系中水结构的FTIR研究

用Peakfit(Version4．12 Seasolve)曲线拟合软件解析了C12-2-C12·2Br／正己醇／正庚烷／水微乳体系的傅里叶变换红外光谱(FTIR)。根据微乳体系中水分子O-H伸缩振动峰的二阶导数谱,对3100-3700 cm-1的吸收峰进行分峰拟合,得到位于(3 240±10)cm-1、(3 380±15)cm-1、(3 470±30)cm-1、(3 570±30)cm-1的4个子峰,分别对应于表面活性剂阳离子头基结合水、本体水、阴离子结合水和束缚水。随着体系中加水量的增加,本体水和阴离子结合水的质量分数减小,阳离子结合水的质量分数增加,而束缚水的质量分数变化很小。

FTIR Study of Water Structure in C12-2-C12·2Br/1-Hexanol/n-Heptane/Water Microemulsion System

The FTIR spectra of solubilized water in C12-2-C12 · 2Br/1-hexanol/n-heptane/water microemulsion system were resolved by Peakfit ( Version 4. 12 Seasolve) curve-fitting program. The hydroxyl stretching region (3100-3700 cm-1) of solubilized water was fitted into four subpeaks according to the results of the second derivative. Four subpeaks located at (3 240±10) cm-1, (3380 ±15) cm-1 ,(3470±30) cm-1 and (3570±30) cm-1 .corresponding to cation bound water,bulk water,anion bound water and trapped water,respectively. Fractions of the four different states of water were estimated quantitatively by the proportion of the areas of four subpeaks to the total area of the O-H stretching band of water. The fractions of bulk water and anion bound water decreased with increase in molar ratio of water to surfactant in the system. Meanwhile the fraction of cation bound water increased and the fraction of trapped water keeps constant basically.