Jaques Victory Armida Janine, Zikmundová Eva, Holas Jiří, Zikmund Tomáš, Kaiser Jozef, Holcová Katarína
Faculty of Science, Institute of Geology and Palaeontology, Charles University, Albertov 6, 12843, Praha, Czech Republic.
CEITEC - Central European Institute of Technology, Brno University of Technology, Purkyňova 123, 612 00, Brno, Czech Republic.
Sci Rep. 2022 Nov 16;12(1):19654. doi: 10.1038/s41598-022-22448-x.
Cross-section preparation of painting micro-samples is part of their routine analysis. This type of preparation can be used for several analytical techniques, such as scanning electron microscopy, Fourier-transform infrared spectroscopy, Raman spectroscopy, and optical microscopy. These techniques offer high-resolution imaging and/or elemental information, providing access to technical and material data important for the interpretation, preservation, and restoration of painted artworks. However, it also means that the material from the sample embedded in the resin becomes unreachable for further analysis, except for the polished surface of the cross-section. Degradation of the embedding medium can also occur over time, which can lead to misinterpretation, loss of information, or even complete destruction of the embedded sample. In the field of cultural heritage, cyclododecane (CDD) is commonly used for the consolidation and protection of objects, and is used in the preparation of cross-sections to prevent contamination of the sample by the embedding medium. This study enhanced the existing preparation process by shaping the CDD layer to enable extraction of the micro-sample from the resin if needed, without compromising the integrity of the sample. Moreover, the purity, the sublimation rate in a normal environment and a vacuum, and the impact of CDD on three different types of samples (historical painting on a canvas, wall painting fragment, model sample) were examined.
绘画微样本的横截面制备是其常规分析的一部分。这种制备方式可用于多种分析技术，如扫描电子显微镜、傅里叶变换红外光谱、拉曼光谱和光学显微镜。这些技术提供高分辨率成像和/或元素信息，能获取对于解读、保存和修复绘画艺术品至关重要的技术和材料数据。然而，这也意味着嵌入树脂中的样本材料除了横截面的抛光表面外，无法再用于进一步分析。随着时间推移，包埋介质也可能发生降解，这可能导致误判、信息丢失，甚至嵌入样本完全损坏。在文化遗产领域，环十二烷（CDD）常用于文物的加固和保护，并且在横截面制备中用于防止样本被包埋介质污染。本研究改进了现有的制备工艺，通过塑造CDD层，以便在需要时能从树脂中提取微样本，同时不损害样本的完整性。此外，还研究了CDD的纯度、在正常环境和真空中的升华速率，以及CDD对三种不同类型样本（帆布上的历史绘画、壁画碎片、模型样本）的影响。
