引用本文:
【打印本页】   【HTML】   【下载PDF全文】   View/Add Comment  【EndNote】   【RefMan】   【BibTex】
过刊浏览    高级检索
本文已被:浏览 46次   下载   
分享到: 微信 更多
Intermolecular Interactions in Self - Assembly Process of Sodium Dodecyl Sulfate by Vertically Polarized Raman Spectra
林珂
Author NameAffiliationE-mail
林珂 物理与光电工程学院 激光工程系 klin@ustc.edu.cn 
Abstract:
Molecular self-assembly is extremely important in many fields, but the characterization of their corresponding intermolecular interactions is still lacking. The C-H stretching Raman band can reflect the hydrophobic interactions during the self-assembly process of sodium dodecyl sulfate (SDS) in aqueous solutions. However, the Raman spectra in this region are seriously overlapped by the OH stretching band of water. In this manuscript, vertically polarized Raman spectra were used to improve the detection sensitivity of spectra of C-H region for the first time. The spectral results showed that the first critical micelle concentration and the second critical micelle concentration of SDS in water were 8.5 mM and 69 mM, respectively, which were consistent with the results given by surface tension measurements. Because of the high sensitivity of vertically polarized Raman spectra, the critical micelle concentration of SDS in a relatively high concentration of salt solution could be obtained in our experiment. For example, the two critical concentrations of SDS in 100 mM NaCl solution were record to be 1.8 mM and 16.5 mM, respectively. Through comparing the spectra and surface tension of SDS in water and in NaCl solution, the self-assembly process in bulk phase and at interface were discussed. What's more, the interactions among salt ions, SDS and water molecules were analyzed. These results demonstrated the vertically polarized Raman spectra could be employed to study the self-assembly process of SDS in water.
Key words:  Vertically polarized Raman spectroscopy  Sodium dodecyl sulfate  Self-assembly  Critical micelle concentration  Intermolecular interactions
FundProject:
十二烷基硫酸钠自组装过程中分子间相互作用力的垂直偏振拉曼光谱研究
林珂
摘要:
分子自组装在很多领域中都极为重要,但是对其相应的分子间相互作用的表征还较为缺乏。C-H伸缩振动带光谱可以反映出十二烷基硫酸钠(SDS)水溶液中自组装过程中分子间相互作用,然而该谱段谱峰重叠严重,且被水的O-H伸缩振动带背景严重干扰。本文中首次利用拉曼光谱的垂直偏振谱提高了SDS水溶液中CH段光谱探测灵敏度。光谱结果给出了SDS在H2O中的第一临界胶束浓度和第二临界胶束浓度分别为8.5 mM和69mM,这个结果与表面张力测量给出的结果一致。因为垂直偏振拉曼光谱的高灵敏度,我们可以给出较大浓度盐溶液中SDS的临界胶束浓度值。例如在100 mM的 NaCl/H2O溶液中这两个临界胶束浓度分别为1.8 mM和16.5 mM。根据SDS在水和NaCl水溶液中的拉曼光谱及表面张力数据,我们讨论了SDS在体相和界面完整的自组装过程。更重要的是讨论了盐离子,SDS分子和水分子之间的相互作用力。这些研究表明垂直偏振拉曼光谱在研究自组装过程中有着重要作用
关键词:  垂直偏振拉曼光谱  十二烷基硫酸钠  自组装  临界胶束浓度  分子间相互作用力
DOI:
分类号: