Susceptibility of different pigments to irradiation by two lasers with different pulse duration and wavelength

IF 6.3 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Applied Surface Science Pub Date : 2025-05-20 DOI:10.1016/j.apsusc.2025.163581

L. Andrés-Herguedas , T. Rivas , A. Ramil , D. Jiménez-Desmond , J.S. Pozo-Antonio

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引用次数: 0

Abstract

The effects of available laser treatments on paint pigments must be taken into consideration for effective cleaning of wall painting. Selection of the most appropriate parameters of the laser is essential for optimal cleaning. This study analysed the effects of two lasers operating at different wavelength and pulse duration (Avia Nd:YVO₄ emitting at 355 nm, with a pulse duration of 25 ns, and Spirit system laser at 1040 nm and 380 fs) on pigments used in wall paintings (tempera and rock art). Specifically, pressed tablets of carbonates (azurite, malachite and lead white), sulphides (cinnabar and orpiment), oxide (hematite) and a natural mixture of silicates and oxides (red earth) were prepared and irradiated for initial measurement of laser damage thresholds and then, higher fluence levels were applied to induce severe changes on surfaces.

Despite of fluences used with the Spirit (IR-fs) were higher than those with Avia (UV-ns), colour changes were generally higher in the latter. Regardless of the laser, sulphides were the most susceptible pigments, and cinnabar underwent intense darkening even at minimum fluence, whereas lead white was the most resistant pigment. Colour changes were attributed to mineralogical and chemical changes in some cases and to micromorphological changes in others.

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不同颜料对两种不同脉冲持续时间和波长激光照射的敏感性

为了有效地清洗墙面，必须考虑可用激光处理对油漆颜料的影响。选择最合适的激光参数是实现最佳清洗的关键。本研究分析了在不同波长和脉冲持续时间下工作的两种激光器（Avia Nd:YVO4激光器发射波长为355 nm，脉冲持续时间为25 ns， Spirit系统激光器发射波长为1040 nm，脉冲持续时间为380 fs）对壁画（tempera和岩石艺术）中使用的颜料的影响。具体来说，制备了碳酸盐（蓝铜矿、孔雀石和白铅）、硫化物（朱砂和赭石）、氧化物（赤铁矿）和硅酸盐和氧化物的天然混合物（红土）的压片，并进行辐照，用于激光损伤阈值的初步测量，然后施加更高的影响水平，以引起表面的严重变化。尽管Spirit使用的影响（IR-fs）高于Avia使用的影响（UV-ns），但后者的颜色变化通常更高。无论激光如何，硫化物是最易受影响的色素，朱砂即使在最小的影响下也会发生强烈的变黑，而铅白是最耐药的色素。颜色变化在某些情况下归因于矿物学和化学变化，在其他情况下归因于微形态变化。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Applied Surface Science 工程技术-材料科学：膜

CiteScore

12.50

自引率

7.50%

发文量

3393

审稿时长

67 days

期刊介绍： Applied Surface Science covers topics contributing to a better understanding of surfaces, interfaces, nanostructures and their applications. The journal is concerned with scientific research on the atomic and molecular level of material properties determined with specific surface analytical techniques and/or computational methods, as well as the processing of such structures.