AI Article Synopsis
- The study analyzes the depth profiles of aged triterpenoid varnishes using advanced laser ablation and two types of spectroscopy techniques to understand how they’ve degraded over time.
- Results show that the varnish structure changes with depth, with a noticeable reduction in carbonyl absorbance and an increase in certain molecular vibrations as you go deeper into the varnish.
- The findings highlight that the upper layers of the varnish absorb more UV radiation, which leads to varying optical properties and degradation patterns throughout the material.
Article Abstract
The depth-profiles of accelerated aged triterpenoid dammar and mastic varnishes, which had been uncovered by optimized KrF excimer laser ablation (248 nm, 25 ns), were examined by ultraviolet-visible (UV/VIS) spectrophotometry and attenuated total reflection (ATR) Fourier transform infrared (FT-IR) spectroscopy. The results reflect both the optical properties at the bulk (UV/VIS) and the surface (ATR/FT-IR) and establish the presence of degradation gradients across the depth of the degraded natural resin films. It is demonstrated that the UV part of the ambient radiation is absorbed by the deteriorated surface and that the optical densities of the aged varnish decrease as a function of depth. The absorbed UV wavelengths at the surface and the depth-wise reduction of light intensity result in a depth-dependent decrease in carbonyl absorbance and an increase in C-H bending vibration modes of methylene species pointing to structural modification in the triterpenoid mixture across depth.
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| http://dx.doi.org/10.1366/000370207782217833 | DOI Listing |
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