The main objective of this study is the ability to determine pore sizes in the studied finely dispersed materials by the characteristics of the interaction of water with a nano-volume. The spectra of water in nanoporous materials S.A. C30M, ssp2t8 were recorded. The spectral features of nanoporous materials were analyzed by varying the amount of water in the pores. The spectral features are compared with previously obtained data for calibrated SiO2 pores of various diameters.
The methane absorption spectra in the range between 6600 and 9200 cm-1 have been recorded at 296 K and 109 K by the Fourier spectrometer IFS – 125M at pressures from 11 to 300 mbar, and spectral resolution 0.03 cm-1. Low temperature cell with a length of 220 cm was used, which provided the threshold sensitivity to absorption of the order of 10-7 cm-1. Empirical values of the lower state energy level were derived from the intensity ratios of the lines measured at 200 K and 296 K. Line assignment of the the 3ν3 band of the 12CH4 molecule was performed. The parameters of Voigt, SDV, HTP contours (the line center, intensity) were determined at 296K.
The 12CH4 absorption spectra in the range between 6600 and 12000 cm-1 have been recorded at 296 K and 200 K by the Fourier spectrometer IFS – 125M at pressures from 11 to 300 mbar, and spectral resolution 0.03 cm-1. Low temperature cell with a length of 220 cm was used, which provided the threshold sensitivity to absorption of the order of 10-7 cm-1. Empirical values of the lower state energy level were derived from the intensity ratios of the lines measured at 200 K and 296 K. Line assignment of the the 3ν3 band of the 12CH4 molecule was performed. The parameters of Voigt contour (the line center, intensity) were determined using multi-fitting procedure at 296K.
The method of approximation polynomials for simultaneous determination of the temperature and concentration of a heated gas from its spectral characteristics is considered. The accuracy of finding the experimental values of the thermodynamic parameters was increased by using an arbitrary number (≥ 2) of spectral centers and taking into account the measurement error of the transmission function. Approbation of the improved technique was carried out using the most accurate measurements of the transmission function of carbon dioxide in the temperature range 500-1770 K and the partial pressure ρCO2 = 0.17-1 atm.
The CO2 transmission function was calculated and compared with the experimental data in the spectral range of 450- 7600 cm-1. The spectral ranges suitable for a determination of temperature and concentration of CO2 were determined. The influence of polynomial degrees on errors of approximating the transmission function and the influence of a number of spectral regions on errors of determining the temperature and partial pressure were analyzed.
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