湿泡沫内应力和结晶度的拉曼光谱研究
Probing Internal Stress and Crystallinity in Wet Foam via Raman Spectroscopy
摘要：
在这篇文章中，我们将湿泡沫中的内应力和振动模式的特征相关联。使用显微镜图像，我们估计在24小时的持续时间内，在特定的时间间隔，在湿泡沫中的气泡的平均尺寸。拉曼光谱也在相同的时间间隔，在相同的时间帧内记录。我们表明，内部应力，起源于宏观结构变化的泡沫与老化，可以与观察到的拉曼位移的低频亚甲基摇摆模式的组成表面活性剂分子在泡沫中。在这份报告中，我们还显示了拉曼光谱揭示泡沫材料的结晶度的能力，当研究了一段较长的时间。
英文摘要：
In this article, we correlate the internal stress and the characteristics of a vibrational mode in wet foam. Using microscope images, we estimate the average size of the bubbles in wet foam, at specific time intervals, over a duration of twenty four hours. Raman spectra are also recorded at the same time intervals, over the same time frame. We show that the internal stress, originated from the macroscopic structural change of foam with ageing, can be related to the observed Raman shift of the low frequency methylene rocking mode of the constituent surfactant molecules in foam. In this report we also show the capability of the Raman spectroscopy to reveal the crystallinity in foamy materials, when studied for a longer period of time.
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