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Study on Infrared Spectrophotometer for Langmuir monolayer

Langmuir单层膜红外分光光度计的研究

基本信息

批准号：
13554027
负责人：
SAKAI Hiroshi
金额：
$ 4.29万
依托单位：
Heian Jogakuin (St.Agnes) University (2002)Heian Jogakuin (St. Agnes') College (2001)
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2001
资助国家：
日本
起止时间：
2001 至 2002
项目状态：
已结题

项目摘要

1 Effect of infrared radiation on FT-IR external reflection spectra of Langmuir monolayers of stearic acid and zinc stearate were examined by changing the amount of radiation energy with a band path filter. If the radiation energy at the level of normal FT-IR measurements was used, the methylene stretching bands of the Langmuir monolayers of stearic acid at large surface areas could not be observed, owing to the temperature increase in the irradiated region and the enormous surface density decrease which follows it. On the contrary the bands of the Langmuir monolayers of zinc stearate were observed at any surface areas. The result means that the monolayer of zinc stearate is rigid and the molecules do not move easily. It is expected that the stearate molecules bind strongly each other through the zinc cations.2 Time dependence of the effect of infrared radiation on FT-IR external reflection spectra of Langmuir monolayers of stearic acid and stearyl alcohol were examined under various surface areas. At low surface pressures, the peak intensities of the bands of the Langmuir monolayers decreased with the time lapse, and finally the peak disappeared. Moreover the decrease occurred more quickly at larger surface areas, and in the Langmuir monolayer of stearic acid than that of stearyl alcohol. This difference of the decrease speed seems to depend on the difference of the viscosity of the Langmuir monolayers.3 FT-IR external reflection spectra of Langmuir mono layers of zinc stearate were recorded under various surface areas and under surface pressure relaxation, and the structural changes of the hydrocarbon chain and the carboxylate group were estimated. Moreover it was elucidated that the orientation of hydrocarbon chain in the zinc 12-hydroxystearate monolayer was different from that in the zinc stearate monolayer.

1用带通滤光片改变红外辐射能量，研究了红外辐射对硬脂酸和硬脂酸锌单分子膜外反射光谱的影响。如果使用正常FT-IR测量水平的辐射能量，则由于辐照区域的温度升高和随之而来的表面密度的巨大降低，在大的表面积处不能观察到硬脂酸的Langmuir单分子膜的亚甲基伸缩带，相反，在任何表面积处都观察到硬脂酸锌的Langmuir单分子膜的带。结果表明，硬脂酸锌单分子层是刚性的，分子不易移动。预计硬脂酸酯分子通过锌阳离子强烈地相互结合。2红外辐射对硬脂酸和硬脂醇的Langmuir单分子膜的FT-IR外反射光谱的影响的时间依赖性在各种表面积下进行了检查。在低表面压下，随着时间的推移，朗缪尔单分子膜谱带的峰强度逐渐减弱，最后峰消失。此外，减少发生更快地在较大的表面积，并在朗缪尔单层的硬脂酸比硬脂醇。这种下降速度的差异似乎取决于朗缪尔单分子膜的粘度的差异。3 FT-IR外反射光谱的硬脂酸锌的朗缪尔单分子膜记录在不同的表面积和表面压力松弛下，和烃链和羧酸基团的结构变化进行了估计。此外，它阐明了在12-羟基硬脂酸锌单分子膜中的烃链的取向是不同的硬脂酸锌单分子膜。