Fluorinated B-72 hybrid silver doped modified nanoparticle as a coating for biological corrosion protection of ancient bricks

IF 5.3 2区材料科学 Q1 MATERIALS SCIENCE, COATINGS & FILMS

Surface & Coatings Technology Pub Date : 2024-10-09 DOI:10.1016/j.surfcoat.2024.131411

Naijing Bu, Miaoting Ye, Kaiyi Wang, Rong Li, Qiang Zhen

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Abstract

In this paper, a superhydrophobic organic-inorganic composite coating containing fluorinated B72 hybrid methyl-modified silica/(Ag doped TiO₂) by hexamethyldisilazane (HMDS) (H-SiO₂/Ag/TiO₂) was prepared by means of a mild and an environmental friendly method. Transparency, adhesion, hardness tests and photocatalytic performance were measured to determine the content of Ag in TiO₂ which the TiO₂/AgNO₃ ratio is 0.008 g/mL. The synthesized Ag/TiO₂ nanoparticles were characterized by X-ray diffraction (XRD), Raman spectra and transmission electron microscope (TEM). The highest contact angle of coated ancient bricks was 148.66° and the color change value of ΔE^⁎ before and after coating was <5 which is within an acceptable range. The physical properties such as apparent porosity and water vapor permeability (ΔMp) were studied. After weathering from acid, alkali, salt, water and ultraviolet radiation, the bricks coated by the composite coatings still have good hydrophobicity that the contact angle were >120° and minor degree of surface corrosion comparing with the ancient bricks. The inhibitory effect of the composite coating on Staphylococcus aureus (S. aureus) and Escherichia coli (E. coli), and that on algae (Chlamydomonas and Dunaliella) were studied through bacteriostasis test and algae comparative experiments, respectively. Finally, the mechanism of the composite coating on antibacterial and anti-algae was studied. The results showed that the appearance of the ancient bricks was not changed after coating, and the anti-weathering, antibacterial and anti-algae properties of the ancient transformation were increased.

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作为古砖生物防腐涂层的氟化 B-72 混合掺银改性纳米粒子

本文采用温和环保的方法制备了一种含氟 B72 混合甲基改性二氧化硅/（掺银 TiO2）的六甲基二硅氮烷（HMDS）超疏水有机无机复合涂层（H-SiO2/Ag/TiO2）。测量了透明度、附着力、硬度测试和光催化性能，以确定 TiO2 中的 Ag 含量（TiO2/AgNO3 的比例为 0.008 g/mL）。通过 X 射线衍射（XRD）、拉曼光谱和透射电子显微镜（TEM）对合成的 Ag/TiO2 纳米粒子进行了表征。涂覆古砖的最高接触角为 148.66°，涂覆前后的色变值ΔE⁎为 <5，在可接受范围内。对表观孔隙率和水蒸气渗透率（ΔMp）等物理性质进行了研究。经过酸、碱、盐、水和紫外线的风化后，涂有复合涂料的砖块仍具有良好的憎水性，接触角为 120°，与古砖相比，表面腐蚀程度较轻。通过抑菌试验和藻类对比实验，分别研究了复合涂层对金黄色葡萄球菌和大肠杆菌的抑制作用，以及对藻类（衣藻和杜纳藻）的抑制作用。最后，研究了复合涂层的抗菌和抗藻机理。结果表明，涂覆后古建砖的外观没有改变，古建改造的抗风化、抗菌和抗藻性能均有所提高。

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来源期刊

Surface & Coatings Technology 工程技术-材料科学：膜

CiteScore

10.00

自引率

11.10%

发文量

921

审稿时长

19 days

期刊介绍： Surface and Coatings Technology is an international archival journal publishing scientific papers on significant developments in surface and interface engineering to modify and improve the surface properties of materials for protection in demanding contact conditions or aggressive environments, or for enhanced functional performance. Contributions range from original scientific articles concerned with fundamental and applied aspects of research or direct applications of metallic, inorganic, organic and composite coatings, to invited reviews of current technology in specific areas. Papers submitted to this journal are expected to be in line with the following aspects in processes, and properties/performance: A. Processes: Physical and chemical vapour deposition techniques, thermal and plasma spraying, surface modification by directed energy techniques such as ion, electron and laser beams, thermo-chemical treatment, wet chemical and electrochemical processes such as plating, sol-gel coating, anodization, plasma electrolytic oxidation, etc., but excluding painting. B. Properties/performance: friction performance, wear resistance (e.g., abrasion, erosion, fretting, etc), corrosion and oxidation resistance, thermal protection, diffusion resistance, hydrophilicity/hydrophobicity, and properties relevant to smart materials behaviour and enhanced multifunctional performance for environmental, energy and medical applications, but excluding device aspects.