Abstract

The compaction of carbon dioxide in the pores of nanoporous silicon aerogel at near-critical temperatures has been studied by coherent anti-Stokes light scattering (CARS) spectroscopy. The density was determined by the shift of the vibrational line at 1388 cm\({}^{-1}\) under isochoric heating from the subcritical temperature of 25.2\({}^{\circ}\)C to the supercritical one of 31.95\({}^{\circ}\)C. It was found that the density of carbon dioxide in nanopores near the critical temperature increases, exceeding the average value in the cuvette by about \({\sim}20\%\).

中文翻译：

---

相干反斯托克斯拉曼光谱分析法检测纳米多孔气凝胶中二氧化碳的临界压缩

摘要

通过相干抗斯托克斯光散射（CARS）光谱研究了近临界温度下纳米多孔硅气凝胶孔中二氧化碳的压缩。在等分加热下，通过振动线在1388 cm \（{} ^ {-1} \）从亚临界温度25.2 \（{} ^ {\ circ} \） C到超临界温度的移动来确定密度。31.95 \（{} ^ {\ circ} \） C的温度。发现临界温度附近的纳米孔中的二氧化碳密度增加，比比色皿中的平均值高约\（{\ sim} 20 \％ \）。