Abstract
Superhydrophobic and water-repellent coatings can have numerous applications including the protection of monuments and other stone objects of the cultural heritage. In this study, the fundamental observations, concepts, and equations provided by T. Young, R.N. Wenzel, A.B.D. Cassie, S. Baxter, and other researchers on the wettability of solid surfaces are briefly described. Moreover, some interesting methods which were devised to induce enhanced hydrophobicity and water repellency to natural stone are briefly reviewed. Finally, a case study is described in detail: siloxane-nanoparticle dispersions are sprayed on sandstone and marble specimens. Using nanoparticles (NPs) in appropriate concentration, the deposited polysiloxane-nanoparticle composite coatings exhibit superhydrophobic and water-repellent properties. It is demonstrated that superhydrophobicity and water repellency can be (1) achieved using exclusively aqueous products, (2) achieved using inherent hydrophilic materials, and (3) accompanied by superoleophobicity and oil repellency. The effects of the coatings on the color, vapor permeability, and water absorption by capillarity of the treated sandstone and marble are discussed.
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Karapanagiotis, I., Hosseini, M. (2018). Superhydrophobic Coatings for the Protection of Natural Stone. In: Hosseini, M., Karapanagiotis, I. (eds) Advanced Materials for the Conservation of Stone. Springer, Cham. https://doi.org/10.1007/978-3-319-72260-3_1
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DOI: https://doi.org/10.1007/978-3-319-72260-3_1
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