Brillouin Scattering study of Structural Instability in Gels

凝胶结构不稳定性的布里渊散射研究

• 批准号: 02640274
• 负责人: ISHIBASHI Yoshihiro
• 金额: $ 1.09万
• 依托单位: Nagoya University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1990
• 资助国家: 日本
• 起止时间: 1990 至 1991
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-02640274/
• 关键词: Gel; Structural instability; Brillouin scattering; Swelling; Fabry-Perot interferometer; 高分子ゲル; ファブリ-ペロ-干渉計

The critical phenomenon in the swelling of polymer-gel has been studied. In this project, it was intended to study elastic instability of the polymer-gel, which is considered as one of the origins of swelling, using Brilloouin scattering technique. Usually the Brillouin peaks of the polymer-gel appear at wave number shifts within <plus-minus> 0.5cm^<-1>. High resolution would be, therefore, required in the experimental eauipment. A pressure scanning Fabry-Perot interferometer designed for observation of the Brillouin scattering with high resolution, high contrast and high stability was constructed, which is equipped with a pair of etalon mirrors, and a double grating monochromator. By adding one more etalon mirror, the Fabry-Perot interferometer can be used as a tandem Fabry-Perot interferometer, which would improve the contrast and the finesse.The Brillouin scattering of the acrylamide-gels were measured by the Facry-perot interferometer. The Brillouin peak was observed at the wave number shift of 0.56cm^<-1> for the "dried" gel. For the "swollen" gels, which show volume change of about two times, the Brillouin peak was observed at the wave number shift of 0.19cm^<-1>. It was confirmed that the elastic constant becomes smaller by swelling. However, it has turned out that it is difficult to measure the Brillouin scattering from much swollen gels, because strong Rayleigh scattering overwhelms the Brillouin peaks of weak intensity.

已经研究了聚合物 - 凝胶肿胀的关键现象。在这个项目中，它旨在研究使用Brilloouin散射技术，这被认为是肿胀的起源之一。通常，聚合物 - 凝胶的brillouin峰出现在<plus-minus> 0.5cm^<-1>内的波数移动。因此，在实验性的范围内将需要高分辨率。构建了旨在观察具有高分辨率，高对比度和高稳定性的Brillouin散射的压力扫描Fabry-Perot干涉仪，并配备了一对eTalon镜子，以及一个双光栅单色器。通过再添加一个eTalon镜子，Fabry-Perot干涉仪可以用作串联Fabry-Perot干涉仪，这将改善对比度和技巧。丙烯酰胺 - 丙烯酰胺凝胶的散射是通过Facry-Perot干涉仪测量的。对于“干”凝胶，在0.56厘米^<-1>的波数偏移下观察到了布鲁因峰。对于“肿胀”凝胶显示的体积变化约两次，在0.19cm^<-1>的波数移位时观察到了布里鲁因峰。已经证实，通过肿胀，弹性常数变小。但是，事实证明，很难从肿胀的凝胶中测量布里渊散射，因为强烈的瑞利散射压倒了弱强度的布里鲁因峰。

项目成果

原 一広: "Optical Characterization of Tungstic Acid around Gelation Time" J.Phys.Soc.Jpn.

Kazuhiro Hara：“凝胶化时间附近钨酸的光学表征”J.Phys.Soc.Jpn。

石橋 善弘: "A Phenomenological Theory of the Low Temperature Transition in K_2Ba(NO_2)_4" Journal of Physical Society of Japan. 59. 2995-2997 (1990)

石桥义博：“K_2Ba(NO_2)_4中低温转变的现象学理论”日本物理学会杂志59。2995-2997（1990）

Hara, Kazuhiro,: "Optical Characterization of Tungstic Acid around Gelation Time" J. Phys. Soc. Jpn.

Hara，Kazuhiro，：“凝胶时间附近钨酸的光学表征”J. Phys。