论文部分内容阅读
运用傅立叶变换红外光谱（ＦＴ－ＩＲ）对水／ＮａＤＥＨＰ／正庚烷微乳体系中水的微结构进行了研究。结果表明，随着体系中加水量的增大，水分子ＯＨ伸缩振动红外吸收峰的频率由３３８５ｃｍ－１向高频移动至３４１７ｃｍ－１（与ＡＯＴ形成的微乳体系的变化趋势相反）。进一步对３０５０ｃｍ－１至３７５０ｃｍ－１范围内的水分子ＯＨ伸缩振动吸收峰进行曲线拟合，得到４个子峰，说明微乳体系中的水分子存在有４种不同的配位环境。４个子峰的频率为（３６１０±１０）ｃｍ－１，（３５１２±１０）ｃｍ－１，（３４２０±１０）ｃｍ－１和（３２５０±２０）ｃｍ－１，分别与自由水、磷酸根的结合水、本体水及Ｎａ＋的结合水相对应。根据各拟合峰的峰面积与总的峰面积之比，可以得知微乳液中处于不同环境的水分子所占的百分含量。本体水的百分含量随着体系中加水量的增大而增大，磷酸根的结合水及自由水所占的百分含量随着加水量的增大而减小，Ｎａ＋离子的结合水所占的百分比随着水与ＮａＤＥＨＰ的摩尔比Ｗ０的增大而增大，Ｗ０等于１１时达到最大值，而后这一百分比随着Ｗ０的增大而减小。不同配位环境中的水分子所占百分数的变化导致了微乳体系中水分子ＯＨ伸缩振动吸收峰向高频方向移动
The microstructure of water in water / NaDEHP / n-heptane microemulsion system was studied by Fourier transform infrared spectroscopy (FT-IR). The results show that the frequency of OH stretching vibrational infrared absorption peak shifts from 3385cm-1 to 3417cm-1 (opposite to that of AOT microemulsion system) as the amount of water in the system increases. Further, curve fitting of the OH stretching vibration absorption peak of water molecule in the range of 3050cm-1 to 3750cm-1 yields four sub-peaks, indicating that there are four different coordination environments for the water molecules in the microemulsion system. The frequencies of four sub peaks were (3610 ± 10) cm-1, (3512 ± 10) cm-1, (3420 ± 10) cm-1 and (3250 ± 20) cm- The combination of water, bulk water and Na + corresponds to the combined water phase. According to the ratio of the peak area of each fitting peak to the total peak area, the percentage of water molecules in different environments in the microemulsion can be obtained. The percentage of body water increased with the increase of water in the system. The percentage of phosphate-bound water and free water decreased with the increase of water addition. The Na + ion-bound water The percentage increases with the increase of W0 of water to NaDEHP, reaches the maximum at W0 of 11, and then decreases with the increase of W0. The changes of the percentage of water molecules in different coordination environments lead to the shift of OH stretching vibration absorption peak of water molecules in the microemulsion system to the high frequency