Waterborne Superhydrophobic and Superoleophobic Coatings for the Protection of Marble and Sandstone

被引:67
作者
Aslanidou, Dimitra [1 ]
Karapanagiotis, Ioannis [1 ]
Lampakis, Dimitrios [1 ]
机构
[1] Univ Ecclesiast Acad Thessaloniki, Dept Management & Conservat Ecclesiast Cultural H, Thessaloniki 54250, Greece
关键词
superhydrophobic; superoleophobic; coating; cultural heritage; marble; sandstone; IMMERSION TREATMENT METHOD; SILICA NANOPARTICLES; HYDROPHOBIC TREATMENTS; ACRYLIC COPOLYMERS; COMPOSITE FILMS; STONE; NANOCOMPOSITES; FABRICATION; SURFACES; POLYMERIZATION;
D O I
10.3390/ma11040585
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Silica nanoparticles were dispersed in an aqueous emulsion of alkoxy silanes and organic fluoropolymer. The dispersion was sprayed onto white marble and sandstone. The deposited composite coatings exhibited (i) superhydrophobicity and superoleophobicity, as evidenced by the high (>150 degrees) static contact angles of water and oil drops as well as (ii) water and oil repellency according to the low (<7 degrees) corresponding tilt contact angles. Apart from marble and sandstone, the coatings with extreme wetting properties were deposited onto concrete, silk, and paper, thus demonstrating the versatility of the method. The siloxane/fluoropolymer product was characterized using Fourier Transform Infrared Spectroscopy (FT-IR), Raman spectroscopy and Scanning Electron Microscopy equipped with an Energy Dispersive X-ray Spectrometer (SEM-EDX). Moreover, SEM and FT-IR were used to reveal the surface structures of the composite coatings and their transition from superhydrophobicity to superhydrophilicity which occurred after severe thermal treatment. The composite coatings slightly reduced the breathability of marble and sandstone and had practically no optical effect on the colour of the two stones. Moreover, the coatings offered good protection against water penetration by capillarity.
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页数:14
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