FTIR spectroscopy applied to woodflour
作者:
N.E. Marcovich,
M.M. Reboredo,
M.I. Aranguren,
期刊:
Composite Interfaces
(Taylor Available online 1996)
卷期:
Volume 4,
issue 3
页码: 119-132
年代: 1996
DOI:10.1163/156855496X00209
出版商: Taylor & Francis Group
关键词: FRIR characterization of wood;diffuse reflectance infrared spectroscopy;woodflour;sawdust;DRIFT subtraction
数据来源: Taylor
摘要:
The features of infrared spectra of woodflour obtained by transmission and diffuse reflectance (DRIFT) are discussed. Intrinsic differences between the two techniques, as well as differences in sample preparation for transmission (pressed pellet) or DRIFT (simple mixing with powered KBr), affect the appearance of the spectra recorded. Other important differences arise from the water content in the sample, as well as in the KBr powder utilized as reference and dilution. Some of these differences are discussed since they occur in regions usually utilized to check modifications in the wood. The effect of sample concentration is investigated for both techniques. In transmission, the opacity of the pellet limits the sample concentration to about 2 wt% in KBr in order to obtain useful spectra. While no concentration limitations are present for DRIFT, distortion of the intensities of bands occur, mainly at low wavelengths. Finally, the use of DRIFT subtraction to detect small surface variations in the woodflour (chemical and physical adsorption of a modifier) is illustrated.
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