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化学学报
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化学学报 ›› 2007, Vol. 65 ›› Issue (13): 1212-1216. 上一篇    下一篇

研究论文

水在C12-EOx-C12•2Br/正己醇/正庚烷W/O微乳中的状态

邓少君, 郑欧, 刘金彦, 赵剑曦*   

  1. (福州大学化学化工学院应用化学系 福州 350002)
  • 投稿日期:2006-06-22 修回日期:2007-01-21 发布日期:2007-07-14
  • 通讯作者: 赵剑曦

States of Water in the W/O Microemulsion Formed in H2O/C12-EOx-C12•2Br/n-Hexanol/n-Heptane

DENG Shao-Jun; ZHENG Ou; LIU Jin-Yan; ZHAO Jian-Xi*   

  1. (Department of Applied Chemistry, College of Chemistry and Chemical Engineering, Fuzhou 350002)
  • Received:2006-06-22 Revised:2007-01-21 Published:2007-07-14
  • Contact: ZHAO Jian-Xi

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以FT-IR方法研究了水/C12-EOx-C12•2Br/正己醇/正庚烷形成的W/O微乳中水的状态. 结果表明, 其中的水存在4种状态, 分别为阳离子头基结合水、反离子结合水、类似本体的水以及束缚在微乳栅栏层中的水. 由解卷积技术分解FT-IR谱图, 进而获得每个表面活性剂分子对应于这4种状态水分子的数目nN＋, nBr-, nb和nf. 随着水含量(W0)增加, nb急剧增大, nN＋少许上升, 而nf和nBr-维持不变, 这说明微乳水核逐渐长大, 且在所考察W0范围内, 表面活性剂头基解离度保持不变.

关键词: 水/C12-EOx-C12•, 2Br/正己醇/正庚烷, W/O微乳, FT-IR, 水状态

The states of water in the W/O microemulsions formed in H2O/C12-EOx-C12•2Br/n-hexanol/ n-heptane systems have been investigated by Fourier transform infrared spectroscopy (FT-IR). The results showed that there existed four states of water in the microemulsions, which were head-group-bound water, Br--bound water, bulklike water and trapped water in the interface of the microemulsion water, respectively. The nN＋, nBr-, nb and nf, which represented respectively the numbers of the water corresponding to the above four states per surfactant molecule, were obtained by a deconvolution technique. With increasing water content W0, nb was increased rapidly but nN＋ increased a little, whereas nBr- and nf were kept almost constant. These indicated that the water pool of the microemulsion grew gradually and the degree of the counter-ion dissociation was kept unchanged over the range of the ex-amined W0.

Key words: H2O/C12-EOx-C12•, 2Br/n-hexanol/n-heptane, W/O microemulsion, FT-IR, water state