40 reviewed and discussed the synthetic approaches to

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40 reviewed and discussed the synthetic approaches to produce nanostructured OIH materials. The main focus was on processes and products that can be carried out in an aqueous medium, even though nonaqueous systems have also been discussed. Later in 2005, Sanchez et al. 59 sum- marized the general chemical pathways to prepare OIH materials and presented remarkable examples of applications of functional OIHs in several areas. The authors highlighted the use of protective coatings based on phenylsilsesquioxanes on structures for naval aircrafts and silsesquioxane–polyester mixtures in coil coating applications. The use of an OIH multilayer system on a mosaic panel of the 14th century ‘‘Last Judgment Mosaic’’ can be seen in the St. Vitus cathedral in Prague. The OIH multilayer system, highlighted by the authors, is composed by a functional layer of organo-alkoxysilanes and oxide nanoparticles, placed between the substrate and a fluoropolymer coating. 59 The intense research efforts on this particular area have justified, almost yearly, a detailed review paper reporting state-of-art OIHs. The fundamental review papers were written by Innocenzi et al., 60 Dash et al., 61 Lebedev, 62 and Sanchez et al. 63 Multilayer systems combining different sol–gel lay- ers with different functions are also an area with high potential and have started to be exploited. The first detailed used of OIHs was a bilayer system to prevent corrosion of metallic substrates by the combination of a super-hydrophobic OIH coating and an OIH coating doped with corrosion inhibitors, proposed by Zheng and Li 64 in 2010. Table 2: The main review articles about sol–gel processes since 2000 Year Authors Discussed subject matter 2000 Bescher and Mackenzie 41 Review of the physical properties of sol–gel coatings 2002 Attia et al. 42 Overview of sol–gel-derived coatings, namely the processes and optical applications 2007 Mackenzie and Bescher 43 Usefulness of the sol–gel process in the synthesis of materials comprising nanoscale architectures. Description of the processing of semiconducting, metallic, ferroelectric, or scintillating nanoparticles in various oxide matrices Niederberger 44 Review of nonaqueous sol–gel routes to produce metal oxide nanoparticles 2008 Sakka 45 Review of the effects of the starting solution composition on the reaction in alkoxysilane solutions for the formation of bulk and fibrous materials, and the microstructure of a particular film coating Dimitriev et al. 46 Summary of the most significant research achievements in sol–gel science and technology 2009 Kozhukharov 47 Discussion of basic concepts related to sol–gel technologies, as well as the most important problems. Correlation of the properties of obtained products, synthesis conditions and the features of the methods applied Wang and Bierwagen 38 Introduction of the basic chemistry involved in sol–gel processes, the progress and development of sol–gel protective coatings on metal substrates and alloys until 2007. Summary of the most relevant limitations of sol–gel coatings Benvenutti et al.
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  • Fall '19
  • 1984, oIh, OIH coatings

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