水在C_(12)-EO_x-C_(12)·2Br/正己醇/正庚烷W/O微乳中的状态  

States of Water in the W/O Microemulsion Formed in H_2O/C_(12)-EO_x-C_(12)·2Br/n-Hexanol/n-Heptane

作　　者：邓少君[1] 郑欧[1] 刘金彦[1] 赵剑曦[1] 

机构地区：[1]福州大学化学化工学院应用化学系,福州350002

出　　处：《化学学报》2007年第13期1212-1216,共5页Acta Chimica Sinica

基　　金：国家自然科学基金(No.20373012)资助项目

摘　　要：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.The states of water in the W/O microemulsions formed in H20/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 Wo, 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 examined Wo.

关 键 词：水/C12-EOx-C12·2Br/正己醇/正庚烷 W/O微乳 FT—IR 水状态 

分 类 号：O648.23[理学—物理化学]