Preparation of Highly Crystalline Nano Ca(OH)2 and Its Comparative Assessment with Commonly Used Materials for the Protection of Wall Paintings

IF 1.5 4区材料科学 Q3 Chemistry

Crystal Research and Technology Pub Date : 2024-05-14 DOI:10.1002/crat.202400021

Ting Zhao, Nian-Chen Ding, Rui Guo, Yuan Fang, Jian-Feng Zhu, Wen-Zong Yang, Yi Qin

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引用次数: 0

Abstract

Due to the ecocompatibility with carbonate-based substrates, Ca(OH)₂ nanoparticles are currently used for cultural heritage conservation such as wall paintings. However, the nano Ca(OH)₂ still suffers from different forms and poor uniformity, limiting its application potential. Also, there is a lack of systematic comparative studies between nano Ca(OH)₂ and the commonly used wall painting reinforcement materials. In this study, homogeneous hexagonal nano Ca(OH)₂ particles with a size of ≈100 nm are successfully prepared through the convenient chemical liquid phase method and by utilizing surfactants to control the growth. The resulting nano Ca(OH)₂ is less agglomerated and has superior crystalline morphology, prolonged suspension time, and more suitable carbonation time in comparison to commercial Ca(OH)₂ materials. Additionally, the reinforcement effect of the resulting nano-Ca(OH)₂ with that of the commonly used pigment layer reinforcement materials such as AC33, B72, Tetraethyl orthosilicate, WPU (Waterborne polyurethane) and commercial Ca(OH)₂ is systematically compared. The synthesized nano Ca(OH)₂ penetrated wall painting blocks to a depth of 683 µm, three times deeper than commercial Ca(OH)₂, achieving moderate color deviation, higher flexural strength (0.529 MPa), and bond strength (1.105 mg cm⁻²), thus highlighting its potential in wall painting reinforcement and expanding its application scope.

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高结晶纳米 Ca(OH)2 的制备及其与常用壁画保护材料的比较评估

由于纳米 Ca（OH）2 与碳酸盐基底具有生态兼容性，目前已被用于壁画等文化遗产的保护。然而，纳米 Ca（OH）2 仍然存在形态各异、均匀性差等问题，限制了其应用潜力。此外，纳米 Ca（OH）2 与常用的壁画加固材料之间也缺乏系统的比较研究。本研究采用简便的化学液相法，利用表面活性剂控制生长，成功制备出均匀的六方纳米 Ca(OH)2 颗粒，粒径≈100 nm。与商用 Ca(OH)2 材料相比，所制备的纳米 Ca(OH)2 的团聚程度更低，结晶形态更优越，悬浮时间更长，碳化时间更合适。此外，还系统比较了纳米 Ca（OH）2 与 AC33、B72、正硅酸四乙酯、WPU（水性聚氨酯）等常用颜料层增强材料以及商用 Ca（OH）2 的增强效果。合成的纳米 Ca（OH）2 在墙面涂料砌块中的渗透深度为 683 µm，是商用 Ca（OH）2 的三倍，颜色偏差适中，抗折强度（0.529 MPa）和粘结强度（1.105 mg cm-2）较高，从而突出了其在墙面涂料加固中的潜力，扩大了其应用范围。

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来源期刊

Crystal Research and Technology CRYSTALLOGRAPHY-

CiteScore

2.50

自引率

6.70%

发文量

121

审稿时长

1.9 months

期刊介绍： The journal Crystal Research and Technology is a pure online Journal (since 2012). Crystal Research and Technology is an international journal examining all aspects of research within experimental, industrial, and theoretical crystallography. The journal covers the relevant aspects of -crystal growth techniques and phenomena (including bulk growth, thin films) -modern crystalline materials (e.g. smart materials, nanocrystals, quasicrystals, liquid crystals) -industrial crystallisation -application of crystals in materials science, electronics, data storage, and optics -experimental, simulation and theoretical studies of the structural properties of crystals -crystallographic computing