FTIR mapping

Bhargava, R., Wall, B. G. and Koenig, J. L. (2000) Comparison of the FTIR mapping and imaging techniques applied to polymeric systems. Appl. Spectrosc. 54(4), 470-9. 

Fig. 7.4 Micro-FTIR map of the interphase for DGEBA-lPDA (left) and DGEBA-DETA systems (right).

We acknowledge the Perkin-Elmer Instruments team from Lyons (and particularly Dr. P. Delmont), for their help in making the x-FTIR maps. Also, we thank the crystallographic group of Claude Bernard University from Lyons 1 (principally D. Merle, Prof Perrin, and Dr. Thozet) for doing XRD analyses and for their helpful discussion. 

FTIR map collected along the cross-section of an EtO-stehlized, shelf-aged UHMWPE acetabular cup. 

Fig. 8. FTIR maps of the reacted and unreacted fibers from the NH stretching vibration at...

The surface of printed paper has been examined through fully automated /xATR-FTIR mapping [464]. Compositional differences attributed to the printed ink, kaolinite, and cellulose distributions were revealed, which are not discemable in the visible. After spectral subtraction of the carbonate also DOP and an aromatic acrylate, both used in paper manufacturing, could be identified. Coles et al. [465] have compared /iFTIR and ATR-FTIR in the quantitative determination of fillers such as kaolin clay in polyethylene/vinyl acetate. Although ATR-FTIR is not as sensitive to kaolin as /xFTIR, the former provides a larger sampling area and more consistent results. ATR-FTIR is sometimes used for in-depth analysis. 

Brain tissue and tumors have rarely been studied using FTIR, although Salzer et al (23) have recently described the use of FTIR mapping as a basis for the classification of human astrocytic gliomas. Glioblastoma multiforme (GBM) is a highly malignant human brain tumor and numerous clinical studies and... 

To compare results from the various approaches, we plot in Fig. 11.18 the maximum transmission values versus wavelength for these l-mm thick slices. It can be seen that as the wavelength reduces to 1.3pm the theoretical maximum transmission value of 64% is approached. The decrease in the maximum transmission values at longer wavelength is due to free-carrier absorption. These high maximum transmission values and uniformity of transmission (as evidenced by the IR camera images and FTIR maps) make this material highly suitable for use in IR window applications. 

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