Robust and transparent smooth amphi-repellent coating with physical self-cleaning and photocatalytic activities

Manoudis, Panagiotis N.; Zuburtikudis, Ioannis; Khalifeh, Hadil Abu; Karapanagiotis, Ioannis

doi:10.1016/j.surfin.2024.104928

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Surfaces and Interfaces

2024

DOI: 10.1016/j.surfin.2024.104928

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Robust and transparent smooth amphi-repellent coating with physical self-cleaning and photocatalytic activities

Panagiotis N. Manoudis,

Ioannis Zuburtikudis,

Hadil Abu Khalifeh

et al.

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2024

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Superhydrophobicity, Photocatalytic Self-Cleaning and Biocidal Activity Combined in a Siloxane-ZnO Composite for the Protection of Limestone

Manoudis,

Zuburtikudis,

Konstantopoulos

et al. 2024

Biomimetics

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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 E. coli and S. aureus, as the inhibitions are 94.8 and 99.9%, respectively. Finally, preliminary studies reveal the chemical stability of the suggested coating.

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Superhydrophobicity, Photocatalytic Self-Cleaning and Biocidal Activity Combined in a Siloxane-ZnO Composite for the Protection of Limestone

Manoudis,

Zuburtikudis,

Konstantopoulos

et al. 2024

Biomimetics

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show abstract

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Robust and transparent smooth amphi-repellent coating with physical self-cleaning and photocatalytic activities

Cited by 1 publication

References 60 publications

Superhydrophobicity, Photocatalytic Self-Cleaning and Biocidal Activity Combined in a Siloxane-ZnO Composite for the Protection of Limestone

Superhydrophobicity, Photocatalytic Self-Cleaning and Biocidal Activity Combined in a Siloxane-ZnO Composite for the Protection of Limestone

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