Manoudis Panagiotis N, Zuburtikudis Ioannis, Konstantopoulos Georgios, Khalifeh Hadil Abu, Kottaridi Christine, Karapanagiotis Ioannis
Lysis Consulting P.C., 55534 Thessaloniki, Greece.
Department of Chemical Engineering, Abu Dhabi University (ADU), Abu Dhabi P.O. Box 59911, United Arab Emirates.
Biomimetics (Basel). 2024 Sep 22;9(9):573. doi: 10.3390/biomimetics9090573.
The erosion phenomena of the natural stone in cultural heritage are induced by various sources. Consequently, the development of multifunctional protective materials that combine two or more useful properties is an effective strategy in addressing the synergistic effects of various erosion mechanisms. A multifunctional coating, consisting of a silane-based precursor and zinc oxide (ZnO) nanoparticles (NPs), is produced and tested for the protection of limestone. The hybrid coating combines the following three properties: superhydrophobicity, including water-repellency, photocatalytic self-cleaning and biocidal activity. The relative concentration of the NPs (0.8% w/w), used for the suggested composite coating, is carefully selected according to wetting studies, colourimetric measurements and durability (tape peeling) tests. The non-wetting state is evidenced on the surface of the composite coating by the large contact angle of water drops (≈153°) and the small contact angle hysteresis (≈5°), which gives rise to a physical self-cleaning scenario (lotus effect). The photocatalytic chemical self-cleaning is shown with the removal of methylene blue, induced by UV-A radiation. Moreover, it is shown that the suggested coating hinders the incubation of and as the inhibitions are 94.8 and 99.9%, respectively. Finally, preliminary studies reveal the chemical stability of the suggested coating.
文化遗产中天然石材的侵蚀现象是由多种因素引起的。因此，开发具有两种或更多有用特性的多功能保护材料是应对各种侵蚀机制协同效应的有效策略。制备了一种由硅烷基前驱体和氧化锌（ZnO）纳米颗粒（NPs）组成的多功能涂层，并对其用于保护石灰石的性能进行了测试。这种混合涂层兼具以下三种特性：超疏水性，包括防水性、光催化自清洁和杀菌活性。根据润湿性研究、比色测量和耐久性（胶带剥离）测试，仔细选择了用于建议复合涂层的NPs的相对浓度（0.8% w/w）。复合涂层表面水滴的大接触角（≈153°）和小接触角滞后（≈5°）证明了其非润湿性状态，这产生了一种物理自清洁现象（荷叶效应）。通过紫外-A辐射诱导亚甲基蓝的去除，展示了光催化化学自清洁性能。此外，研究表明，建议的涂层对 和 的抑制率分别为94.8%和99.9%，从而阻碍了它们的孵化。最后，初步研究揭示了建议涂层的化学稳定性。
