Development of Strutural Method for the Study of Two Dimensional Molecular Arrangement of Monolayers on the Surfaces of Water and Baseplate

研究水和基板表面单分子层二维分子排列的结构方法的发展

• 批准号: 62850010
• 负责人: MATSUSHITA Tadashi
• 金额: $ 5.44万
• 依托单位: National Laboratory for High Energy Physics
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Developmental Scientific Research
• 财政年份: 1987
• 资助国家: 日本
• 起止时间: 1987 至 1988
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-62850010/
• 关键词: Synchrotron Radiation; Surface diffraction; ラングミュアー膜

In fiscal year of 1987, an X-ray gonimeter and a truph for surface diffraction study were prepared. In fiscal 1988 year, we confirmed that a good quality Langmuir film is formed on the surface of water using this truph. We performed a surface diffraction experiment from a monolayer film on the surface of water using this truph and synchrotron radiation beam available on a multipole wiggler beamline at the Photon factory, National Laboratory for High Energy Physics. For the case of arachidate specimen we observed a diffraction peak even at medium surface tension region where it is believed that liquid phase of the two dimensional system is formed. This peak moved from low angle to higher angle as the surface tension is increased reflecting that the intermolecular distance is shortened. At higher tension region where it is believed that a solid phase is formed, the diffraction peak became sharper,but the angle position stayed constant. in the presence of cadmium ion in the water, a diffraction peak was observed even at very low surface tension region where it is believed that a gas phase of the two dimensional system is formed.The angle position of this peak stayed constant, while the peak intensity increase as the surface tension was increased. This may be interpreted that island like structures are formed even at very low surface tension, and these structures grows as the surface tension is increased.As described above, we were successful in extracting useful information on the two dimensional structure of monolayer films on the surface of water using a surface diffraction technique.

1987财政年度，研制了用于表面衍射研究的x射线测角仪和实台。在1988财政年度，我们用这个真理证实了在水面上形成质量良好的朗缪尔薄膜。我们在国家高能物理实验室光子工厂的多极摆动波束线上使用该波束和同步辐射波束对水表面的单层膜进行了表面衍射实验。对于甲酯样品，我们观察到即使在中等表面张力区域也有衍射峰，认为二维体系形成了液相。随着表面张力的增加，该峰从低角度向高角度移动，反映了分子间距离的缩短。在认为形成固相的高张力区，衍射峰变得更尖锐，但角度位置保持不变。在镉离子存在的情况下，即使在表面张力很低的区域也观察到衍射峰，认为二维体系形成了气相。该峰的角度位置保持不变，而峰值强度随着表面张力的增加而增加。这可以解释为即使在非常低的表面张力下也会形成岛状结构，并且这些结构随着表面张力的增加而增长。如上所述，我们成功地利用表面衍射技术提取了关于水表面单层膜二维结构的有用信息。