Recent trends in the application of Fourier Transform Infrared (FT-IR) spectroscopy in Heritage Science: from micro- to non-invasive FT-IR

2019 ◽  
Vol 4 (11) ◽  
Author(s):  
F. Rosi ◽  
L. Cartechini ◽  
D. Sali ◽  
C. Miliani
Keyword(s):  
Ir Spectroscopy ◽  
Chemical Properties ◽  
Non Invasive ◽  
High Lateral Resolution ◽  
Heritage Science ◽  
Macro Scale ◽  
Archaeological Materials ◽  
Molecular Specificity ◽  
Ft Ir ◽  
Ft Ir Spectroscopy

Abstract The relevance of FT-IR spectroscopy in heritage science has experienced a constant grow in the last two decades owing to analytical peculiarities that make it an extremely useful tool to answer the questions posed by the study and conservation of art-historical and archaeological materials. High versatility, sensitivity and molecular specificity are, in fact, all requirements that FT-IR spectroscopy fulfils allowing for the investigation of the chemical properties of heritage materials spanning from the micro- to the macro-scale and offering a variety of approaches to minimize sample manipulation and maximize extracted information. Molecular identification and localisation at high lateral resolution of organic and inorganic components in micro-samples was, over recently, the mostly exploited use of FT-IR in heritage science; however, benefiting from technological progress and advances in optical materials and components achieved in the last decade, it now stands out also for non-invasive surface analysis of artworks by fully portable instrumentation.

scholarly journals Synthesis of L-DOPA Based Melanins with Reproducible Physic-Chemical Properties

2018 ◽  
Author(s):  
Koen Vercruysse ◽  
Jayla Moore
Keyword(s):  
Ir Spectroscopy ◽  
Enzymatic Synthesis ◽  
Chemical Properties ◽  
Size Exclusion ◽  
Synthesis Methods ◽  
Ongoing Research ◽  
Vis Spectroscopy ◽  
Exclusion Chromatography ◽  
Ft Ir ◽  
Ft Ir Spectroscopy

This report expands our ongoing research efforts into the non-enzymatic synthesis of melanins. We have explored four different methods for the synthesis of L-DOPA based melanins and evaluated the reproducibility of some of their physic-chemical properties. The melanins were synthesized through the addition of NaOH, tyrosinate or Fe<sup>2+</sup>/H<sub>2</sub>O<sub>2</sub>. Two different approaches for the reactions involving Fe<sup>2+</sup> and H<sub>2</sub>O<sub>2</sub> were tested: a) addition of H<sub>2</sub>O<sub>2</sub> spread out over multiple days or b) addition of H<sub>2</sub>O<sub>2</sub> in one fraction at the start of the reaction. The physic-chemical properties of the melanins explored involved: 1) retention on size exclusion chromatography column, 2) FT-IR spectroscopy, 3) UV-Vis spectroscopy and 4) the capacity to reduce a redox dye, dichlorophenolindophenol. Overall the results obtained indicated that 1) the various synthesis methods lead to melanins with reproducible physic-chemical properties, 2) that the melanins synthesized in the presence of Fe<sup>2+</sup>/H<sub>2</sub>O<sub>2</sub> are distinctly different from the melanins synthesized in the presence of NaOH or tyrosinate and 3) that no distinctly different melanins were generated when comparing the two different synthesis approaches involving Fe<sup>2+</sup>/H<sub>2</sub>O<sub>2</sub>. Only the melanins synthesized in the presence of Fe<sup>2+</sup>/H<sub>2</sub>O<sub>2</sub> appeared to possess the capacity to reduce dichlorophenolindophenol.

Non-invasive reflection FT-IR spectroscopy for on-site detection of cleaning system residues on polychrome surfaces

2020 ◽  
Vol 157 ◽  
pp. 105033
Author(s):  
Patrizia Moretti ◽  
Francesca Rosi ◽  
Costanza Miliani ◽  
Melissa Daugherty ◽  
Klaas Jan van den Berg ◽  
...  
Keyword(s):  
Ir Spectroscopy ◽  
Non Invasive ◽  
Cleaning System ◽  
Ft Ir ◽  
Ft Ir Spectroscopy

The characterization of natural gemstones using non-invasive FT-IR spectroscopy: New data on tourmalines

Talanta ◽  
2018 ◽  
Vol 178 ◽  
pp. 147-159 ◽  
Author(s):  
Mariano Mercurio ◽  
Manuela Rossi ◽  
Francesco Izzo ◽  
Piergiulio Cappelletti ◽  
Chiara Germinario ◽  
...  
Keyword(s):  
Ir Spectroscopy ◽  
Non Invasive ◽  
Ft Ir ◽  
Ft Ir Spectroscopy

scholarly journals Reflectance FT-IR spectroscopy as a viable option for textile fiber identification

2019 ◽  
Vol 7 (1) ◽  
Author(s):  
Pilleriin Peets ◽  
Karl Kaupmees ◽  
Signe Vahur ◽  
Ivo Leito
Keyword(s):  
Ir Spectroscopy ◽  
Principal Component ◽  
Textile Fibers ◽  
Random Forest Classification ◽  
Non Invasive ◽  
Forest Classification ◽  
Ft Ir ◽  
Instrumental Approaches ◽  
Ft Ir Spectroscopy

AbstractIn this study, the reflectance-FT-IR (r-FT-IR) spectroscopy is demonstrated to be a suitable option for non-invasive identification of textile fibers. A collection of known textile fibers, 61 single-component textiles from 16 different types, were analyzed, resulting in more than 4000 individual spectra. The r-FT-IR method was compared with ATR-FT-IR spectroscopy using two instrumental approaches: FT-IR-microspectrometer with ATR mode (mATR-FT-IR) and ATR-FT-IR spectrometer (ATR-FT-IR). Advantages and drawbacks of these methods were discussed. Principal component based discriminant analysis and random forest classification methods were created for the identification of textile fibers in case-study samples. It was concluded that in general, the performance of r-FT-IR is comparable with ATR-FT-IR. In particular, r-FT-IR is more successful than ATR-FT-IR in differentiating between the amide-based fibers wool, silk and polyamide. As an additional result of this work, a collection of r-FT-IR spectra of different textile fibers was compiled and made available for the scientific community.

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