11 research outputs found
ChemInform Abstract: Synthesis and Fungicidal Activity of Novel 1,3-Disubstituted 1H-Diazirine Derivatives.
ChemInform Abstract: Synthesis and Growth Regulatory Activity of Pyrazolesulfanyl- and Isoxazolesulfanyl-1H-[1,2,4]triazoles and Their Azinyl Derivatives.
ChemInform Abstract: Synthesis of Novel 1,3-Substituted 1H-[1,2,4]-Triazole-3-thiol Derivatives.
Study of the Degradation and Conservation of Historical Leather Book Covers with Macro Attenuated Total Reflection–Fourier Transform Infrared Spectroscopic Imaging
The analytical study
of historical collagen-based materials such
as leather book covers is a complex task for conservation scientists.
Historical leather presents a heterogeneous composition of both organic
and inorganic materials that show an evident reactivity, particularly
when exposed to specific environments. Its correct preservation in
archival documents remains challenging as some aspects of its chemical
composition, degradation, and effectiveness of conservation treatments
are still not fully understood. Here, we describe a novel application
of attenuated total reflection (ATR)–Fourier transform infrared
spectroscopic imaging coupled with a macro ATR accessory to study
historical leather book covers. This nondestructive and high spatial
resolution approach has allowed the visualization of degradation phenomena
affecting this fragile material, particularly the gelatinization of
collagen and, for the first time, the detection of the formation of
calcium stearate (metal carboxylates or soaps). In addition, the distribution
of modified soybean oil used as a treatment to maintain properties
such as elasticity and hydrophobicity of the leather was studied.
The effect of anomalous dispersion on the strong IR bands obtained
in the ATR mode and the resulting changes to the band positions are
also discussed. This research addresses issues that are relevant to
the conservation of archival materials of cultural heritage for future
generations