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Fig. 13. Three common liquid contaminants including muddy water, coffee, and orange juice are poured on prepared SHP paper, fabric and shoe surfaces respectively to test the antifouling ability of the SHP coating are reproduced from ref.,58 are reproduced from copyright 2017.
Qu et al. 59 obtained mechanically durable superhydrophobicity by mimicking the lotus leaf’s ability of self-repairing micro-structures and regenerating hydrophobic wax layer. The as-prepared material not only is mechanically durable, but also can be enhanced by the surface abrasion. The mechanical adhesion of both dense and mesoporous TiO2 coatings are not affected by domestic and environmental enduring. However, enduring effects on the initial CA, efficiency, concentration, the degradation rate and the surface composition 60. Low-cost synthesis of large-scale ultra-durable SHP coatings by rapid template-free micro nanotexturing of IPNs. The resulting coatings demonstrate outstanding anti-AR maintaining SHP water CAs and a pristine lotus effect on SAs of below 10° for up to 120 continuous abrasion cycles. This spray-able polyurethane-acrylic colloidal suspension and surface texture provide a rapid and low-cost approach for the substrate-independent fabrication of ultra-durable, transparent SCS with superior abrasion, chemical, and UV resistance 25. The micrographs result presented in Fig. 14.
2.5 Miscellaneous techniques
The long-term durability of SHP 61 has reasonably significant for the SCT. Fabricating of a simple and environmentally friendly method of copper-based SHP materials developed. A wetting photograph of one of the newly prepared copper-based blocks presented in Fig. 15a, the water droplet still presents a spherical shape and the CA still reach 153.1° and the rolling angle has less than 8°, when the same sample has placed in the air for 10 months was presented in Fig. 15b, from the figure, which gives that the SHP at the as-prepared copper-based material surfaces has a long-term durability 62.
Zhi et al. 63 reported a simple fabrication method of a durable SHP top surface was connected intensely to the substrate through a middle connecting layer. The abrasion test results was shown that the surface could bear 180 abrasion cycles on 1200 CW sandpaper under 2 kPa applied pressure. Han et al. 64 fabricated and enhanced SHP tungsten hierarchical surfaces, which could survive 70 abrasion cycles, 28 min of solid particle impact or 500 tape peeling cycles to retain CAs of greater than 150 and SAs of less than 20, which established for durability test. This type of research elucidates to achieve high durability of the SHP surfaces and it was capable of improving the durability of SHP surfaces for practical applications. Some SHP surface displays mechanically durable 65 polysiloxane SHP surface were successfully prepared by using polymerization of silanes blending with particles. The as-prepared polysiloxane surface showed stable SHP even after the surface underwent a long distance friction. The recyclable SC-SHP materials were prepared by employing surface-functionalized quartz sand particles embedded into polyvinyl chloride. These materials show good superhydrophobicity under 5H pencil hardness test, maintain even after 500 cm abrasion test loaded into 500g 66. The surfaces of the as-prepared SHP material on various substrates have the static water CAs of 156 ± 1°, as was presented in Fig. 16 (a-d). The recent progress of SC-SHP surfaces was studied with help of strategy, and development of materials 67. This consideration of prospectus critically reviews, and highlighted the altered types of SCS, fabrication techniques, working mechanisms, and their applications are used globally 68 and studied for different industrial application. The recent ongoing application studies under considerations of durability in SCT studied as follows. The durability of photocatalytic activity was measured during one year of outdoor exposure test and 2000h of accelerated ageing in a chamber with ultra-violet (UV) radiation and condensation cycles. The results exhibited that photocatalytic activity has been unchanged on concrete, whereas on sandstone, after artificial ageing, and it was reduced due to the removal of nanoparticles from the surface 53. Jeevahan et al. 69 presented a comprehensive review of some of the recent works in the preparation of SHP surfaces, their possible applications, and the challenges confronted with their new applications are studied. Recently, SCT also studies with different advanced applications.
3.1 SC Building
Nanomaterials TiO2 and SiO2 are mostly used for the construction of the building. These are the main task to improve the essential properties such as strength, durability, bond strength, and corrosion resistance, and AR. Durable SC coatings for architectural surfaces incorporating into TiO2 nano-particles into hydroxyapatite films were investigated as a possible route to provided marble with durable SC ability and mechanical strengthening 70. It is a great challenge to constructing a building with SC coating activity. Using a simple and low-cost process, SHP and oleophobic building surfaces have been developed 71. Andaloro et al. 72 reported the SC performance of titanium dioxide and silicon dioxide based coatings with cladding materials. Primary laboratory tests achieved to confirm that the hydrophobic and hydrophilic behavior, prior to outdoor application over the water CA measurements. Afterward, outdoor tests done to monitor color variation on 36 months to verify product effectiveness and its durability. The different cladding materials treated with the sol product varieties and their SC performance monitored over 36 months. Sols applied for pressurized spray coating techniques as shown in Fig. 17. Recently, Amorim et al. 73 studied towards an e?cient and durable SC acrylic paint containing mesoporous TiO2 microspheres, according to the cycling tests, paint containing MTiO2 displayed good photo-activity when compared to a commercial paint.