Informace o publikaci
APPLICATION OF A HANDHELD FTIR SPECTROMETER WITH DIFFUSE REFLECTANCE AND ATR HOLDERS FOR THE ANALYSIS OF PAINTED ARTWORKS
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| Rok publikování | 2014 |
| Druh | Další prezentace na konferencích |
| Citace | |
| Popis | Portable handheld mid-Fourier transform infrared spectrometer ExoScan FTIR (Agilent Technologies) with diffuse reflectance (DR) and attenuated total reflectance (ATR) were used for analysis of reference samples of inorganic pigments in mixtures with organic binders with the aim to describe the analytical limits of the method on simple monolayer systems. In the second step the equipment has been tested on simple paintings on paper support and on coloured photographs. Handheld instruments became very popular in last years in different application fields, but, in a case of handheld FTIR, only a few studies have been reported yet. The major limit for a routine use still can be seen in a relatively high weight of instruments and the absence of any sighting system. When measuring from hand, it is also not very easy to achieve a sufficient contact pressure for to obtain reliable spectra with ATR holder. Further circumstance limiting any wider use of ATR system in handheld instruments is the fact of very low penetration (several micrometres only) causing that the analytical signal is collected from the top surface layer only. On the other hand, diffuse reflectance holder produces good-quality spectra in general, and the drawbacks are roughly the same as in IR microscopes (deformations of spectra, increased noise, poor signal from dark materials etc.) In this study, we compared the DR and ATR modes on model samples with very promising results, described the detection limits for proteinaceous binders in selected inorganic matrices a tried to find the most perspective application fields of the handheld FTIR in the analysis of fine arts. We used the method for a distinguishing of paper treatment (e.g. gluing), for the painting technique description in the modern art (watercolour, wax crayon or oil painting), and for the materials investigation of coloured photographs. |