木粉濃度與顆粒大小對木材散反射傅立葉轉換紅外線光譜分析之影響

Influence of Concentration and Particle Size on the DRIFT Spectroscopy of Wood

張上鎭(Shang-Tzen Chang) ； 吳季玲(Chi-Lin Wu) ； 王升陽(Sheng-Yang Wang) ； 張惠婷(Hui-Ting Chang)

《台灣林業科學》 13卷1期 (1998/03) Pp. 11-18

https://doi.org/10.7075/TJFS.199803.0011

摘要

This study evaluates the effects of the concentration and particle size of wood powders in KBr on the diffuse reflectance infrared Fourier transform (DRIFT) spectroscopy of China fir (Cunninghamia lanceolata var. lanceolata). The DRIFT spectra of wood powder in KBr were measured over a concentration range of 1 to 100 wt percent with particle size over a diameter range of 61μn to 3mm. It was demonstrated that the characteristics of the DRIFT spectra of China fir were very much influenced by the concentration of wood powder in KBr. By comparing with the absorbance spectrum obtained using the traditional transmission technique in KBr pellets, spectral distortions occurred as a function of the concentration and particle size of wood powders in KBr. Results clearly reveal that an anomalous effect caused by the specular reflection was observed mainly between the 950cm^(-1) and 1200cm^(-1) regions with a shift to higher wavenumber and a significant variation in the relative intensities at 1735cm^(-1), 1645cm^(-1), 1158cm^(-1), 1106cm^(-1), 898cm^(-1), and 810cm^(-1) The spectral distortions can be suppressed by decreasing the concentration and particle size of wood powders in KBr. It was possible to obtain a high quality DRIFT spectrum, similar to the absorbance spectrum obtained using KBr pellets, from diluting wood powders, with diameters smaller than 200μm, in KBr at concentrations not exceeding 10%.

關鍵字

散反射傅立葉紅外線光譜 ； 木粉 ； 濃度 ； 顆粒大小 ； 杉木

並列摘要

This study evaluates the effects of the concentration and particle size of wood powders in KBr on the diffuse reflectance infrared Fourier transform (DRIFT) spectroscopy of China fir (Cunninghamia lanceolata var. lanceolata). The DRIFT spectra of wood powder in KBr were measured over a concentration range of 1 to 100 wt percent with particle size over a diameter range of 61μn to 3mm. It was demonstrated that the characteristics of the DRIFT spectra of China fir were very much influenced by the concentration of wood powder in KBr. By comparing with the absorbance spectrum obtained using the traditional transmission technique in KBr pellets, spectral distortions occurred as a function of the concentration and particle size of wood powders in KBr. Results clearly reveal that an anomalous effect caused by the specular reflection was observed mainly between the 950cm^(-1) and 1200cm^(-1) regions with a shift to higher wavenumber and a significant variation in the relative intensities at 1735cm^(-1), 1645cm^(-1), 1158cm^(-1), 1106cm^(-1), 898cm^(-1), and 810cm^(-1) The spectral distortions can be suppressed by decreasing the concentration and particle size of wood powders in KBr. It was possible to obtain a high quality DRIFT spectrum, similar to the absorbance spectrum obtained using KBr pellets, from diluting wood powders, with diameters smaller than 200μm, in KBr at concentrations not exceeding 10%.

並列關鍵字

DRIFT ； wood powder ； concentration ； particle size ； China fir (Cunninghamia lanceolata var. lanceolata)