CARS-measurement of adsorption isotherms of carbon dioxide in Vycor glass and CARS-porosimetry,Journal of Raman Spectroscopy

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CARS-measurement of adsorption isotherms of carbon dioxide in Vycor glass and CARS-porosimetry
Journal of Raman Spectroscopy ( IF 2.4 ) Pub Date : 2021-08-13 , DOI: 10.1002/jrs.6196
Vladimir G. Arakcheev ₁ , Alexey N. Bekin ₁ , Viacheslav B. Morozov ₁

Affiliation

It has been shown recently that coherent anti-Stokes Raman scattering (CARS) allows probing the adsorption in optically transparent bulk nanoporous materials. The phases appearing in the pores at different conditions are identified by their resonant spectral contributions characterized by special values of the Raman shift and the linewidth. The present work demonstrates that the spectral amplitudes retrieved from the CARS spectra are the key for numerical description of the specific loadings of the phases. As a result, the adsorption isotherms can be obtained from the spectroscopic data. An essential point here is the presence of the nonresonant background caused by the material of the nanoporous matrix. It is used as the reference to overcome changes in collimated transparency of the sample in the pressure range at which the condensation occurs in the pores. Also, we show that the average pore radius can be estimated by analysis of a single CARS spectrum, allowing for the CARS-porosimetry.

中文翻译：

CARS-测量Vycor玻璃中二氧化碳的吸附等温线和CARS-孔隙率测定法

最近已经表明，相干反斯托克斯拉曼散射 (CARS) 允许探测光学透明体纳米多孔材料中的吸附。在不同条件下出现在孔隙中的相通过其共振光谱贡献来识别，其特征在于拉曼位移和线宽的特殊值。目前的工作表明，从 CARS 谱中提取的谱振幅是数值描述相位特定载荷的关键。因此，可以从光谱数据中获得吸附等温线。这里的一个要点是存在由纳米多孔基质材料引起的非共振背景。它用作参考，以克服在孔隙中发生冷凝的压力范围内样品准直透明度的变化。此外，我们表明可以通过分析单个 CARS 光谱来估计平均孔隙半径，从而可以进行 CARS 孔隙率测定。

更新日期：2021-09-13

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