History of Organic–Inorganic Hybrid Materials: Prehistory, Art, Science, and Advanced Applications

Faustini, Marco; Nicole, Lionel; Ruiz‐Hitzky, Eduardo; Sánchez, Clément

doi:10.1002/adfm.201704158

Cited by 302 publications

(244 citation statements)

References 382 publications

(262 reference statements)

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“…This section will briefly focus on the historical perspective of the first industrial interest in sol-gel materials, followed by their commercialization as coatings. A detailed and very complete historical perception on the evolution of OIH material can be found elsewhere [78].…”

Section: Sol-gel Process: a Historical Perspective And Applicationsmentioning

confidence: 99%

“…Additionally, the opportunity for modifying the materials structures at a nanoscale level ( Figure 1) lead to the synthesis of advanced ceramics. From the 1940s until the end of the 1970s, the advances using the sol-gel process were mainly focused on the development of mixed OIH materials [78]. At that time, some labs, such as atomic energy in the United States of America, had already applied the sol-gel route to produce pellets and fuel powders.…”

Section: Sol-gel Process: a Historical Perspective And Applicationsmentioning

confidence: 99%

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Hybrid Sol–gel Coatings for Corrosion Mitigation: A Critical Review

Figueira

2020

Polymers

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The corrosion process is a major source of metallic material degradation, particularly in aggressive environments, such as marine ones. Corrosion progression affects the service life of a given metallic structure, which may end in structural failure, leakage, product loss and environmental pollution linked to large financial costs. According to NACE, the annual cost of corrosion worldwide was estimated, in 2016, to be around 3%-4% of the world's gross domestic product. Therefore, the use of methodologies for corrosion mitigation are extremely important. The approaches used can be passive or active. A passive approach is preventive and may be achieved by emplacing a barrier layer, such as a coating that hinders the contact of the metallic substrate with the aggressive environment. An active approach is generally employed when the corrosion is set in. That seeks to reduce the corrosion rate when the protective barrier is already damaged and the aggressive species (i.e., corrosive agents) are in contact with the metallic substrate. In this case, this is more a remediation methodology than a preventive action, such as the use of coatings. The sol-gel synthesis process, over the past few decades, gained remarkable importance in diverse areas of application. Sol-gel allows the combination of inorganic and organic materials in a single-phase and has led to the development of organic-inorganic hybrid (OIH) coatings for several applications, including for corrosion mitigation. This manuscript succinctly reviews the fundamentals of sol-gel concepts and the parameters that influence the processing techniques. The state-of-the-art of the OIH sol-gel coatings reported in the last few years for corrosion protection, are also assessed. Lastly, a brief perspective on the limitations, standing challenges and future perspectives of the field are critically discussed.Polymers 2020, 12, 689 The development of OIH sol-gel coatings, based on siloxanes, for corrosion mitigation, has been widely studied in the last few years [2,31,[36][37][38]. Numerous studies have been conducted since the early 1990s [39,40]. The studies performed showed that siloxanes were effective in mitigating the corrosion processes of different metallic substrates. This development was mainly due to the need for alternative environmentally friend materials and processes to replace the traditional chromium-based pre-treatments. Hexavalent chromium (Cr (VI)) is carcinogenic and shows high environmental toxicity and its use has been forbidden since 2006. However, Cr(VI) based pre-treatments improve the coating adherence to the substrate and are effective corrosion inhibitors [41][42][43] which make its replacement challenging. The use of the sol-gel method to produce OIH coatings for corrosion mitigation suits the main requirements of what should be an environmentally friendly process (i.e., excludes washing stages; it is a waste-free method) and allows one to obtain coatings with high purity and specific pore volumes and surface areas. Since it is a mild synthesis...

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Section: Sol-gel Process: a Historical Perspective And Applicationsmentioning

confidence: 99%

Section: Sol-gel Process: a Historical Perspective And Applicationsmentioning

confidence: 99%

Hybrid Sol–gel Coatings for Corrosion Mitigation: A Critical Review

Figueira

2020

Polymers

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“…In contrast to β-diketone metal alkoxide compounds, the imine, amine, and carboxylate metal alkoxide compounds were resulted in oligomeric structures like tetramer or hexamer structures (19)(20)(21). The degree of oligomerization is affected by the acidity or basicity of ligands, stirring times and temperatures of reactions, the freshness of metal alkoxides, solvent types, etc.…”

Section: Resultsmentioning

confidence: 99%

Synthesis and characterization of Ti-/Zr-diphenylpropanedione complexes and their application in the ring opening polymerization of Ɛ-caprolactone

Gökalp

Kayan²

2018

Journal of the Turkish Chemical Society Section A: Chemistry

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The purpose has been to achieve a controlled ring-opening polymerization of ɛcaprolactone, resulting in polymers with desirable properties such as high molecular weight, low polydispersity index, and highly regio-/stereo regular forms. Therefore, it is important to synthesize single site or reduced number of active site metal alkoxide compounds as catalysts. Ti(IV)/Zr(IV) diphenylpropanedione complexes were synthesized by reactions of titanium or zirconium alkoxides with diphenylpropanedione (dion) ligand. The obtained complexes were characterized by nuclear magnetic resonance ( 1 H-, 13 C-NMR), high resolution mass (HRMS), Fourier transform infrared (FTIR) spectroscopies and elemental analysis. These compounds were tested as catalysts for the ring opening polymerization of Ɛ-caprolactone. The structure of poly-caprolactone (PCL) was analyzed by some spectroscopic techniques (NMR, FTIR) and gel permeation chromatography (GPC). In this work, all Ti-/Zr-complexes were effective over polymerization of Ɛ-caprolactone in solventless environment. Consequently, Ɛ-caprolactone polymers were obtained different average molecular weights between 7000-34000 Da with the PDI values of 1.14-1.60.Cite this: Gökalp Y, Kayan A. Synthesis and characterization of Ti-/Zr-diphenylpropanedione complexes and their application in the ring opening polymerization of Ɛ-caprolactone.

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“…Owing to its unique C-Si bond structure, the highperformance silicone material combines the properties of inorganic materials and organic materials. [1,2] They have basic properties such as low surface tension, low viscosity coefficient, high compressibility and high gas permeability, also have excellent properties such as high and low temperature resistance, electrical insulation, resistance to oxidation stability and physiological inertness. They are widely used in aerospace, electrical and electronics, construction, medical and other industries.…”

Section: Introductionmentioning

confidence: 99%

Mechanism on The Disproportionating Synthesis of Dichlorodimethyl‐ silane by ZSM‐5(5 T)@γ‐Al₂O₃ Series Core‐Shell Catalysts

Yan

Yang

et al. 2019

Applied Organom Chemis

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In view of the wide application of organosilicon bifunctional structure in industry, the most effective disproportionation solution is used by the new catalyst to prepare the largest and the most versatile organic silicon monomer dimethyldichlorosilane. However, there are still remaining doubts on the disproportionation mechanism of the catalyst. The Density Functional Theory (DFT) was used to theoretically calculate the disproportionation mechanism of 5 T clusters ZSM‐5@γ‐Al2O3 series catalysts at the B3LYP/6–311++G(3df, 2pd) level. The properties were verified and the catalytic effects of different active sites pre‐ and post‐ modified by AlCl3 were calculated and compared. The active center of HZSM‐5@γ‐Al2O3 was proton, and that of AlCl3/ZSM‐5@γ‐Al2O3 changed to lewis acidic center. The presence of the lewis acid center enhances the total activity of the catalyst to some extent. The catalytic activity of the 5 T cluster ZSM‐5@γ‐Al2O3 catalyst modified by AlCl3 was higher, which was the same as the experimental results.

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History of Organic–Inorganic Hybrid Materials: Prehistory, Art, Science, and Advanced Applications

Cited by 302 publications

References 382 publications

Hybrid Sol–gel Coatings for Corrosion Mitigation: A Critical Review

Hybrid Sol–gel Coatings for Corrosion Mitigation: A Critical Review

Synthesis and characterization of Ti-/Zr-diphenylpropanedione complexes and their application in the ring opening polymerization of Ɛ-caprolactone

Mechanism on The Disproportionating Synthesis of Dichlorodimethyl‐ silane by ZSM‐5(5 T)@γ‐Al₂O₃ Series Core‐Shell Catalysts

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History of Organic–Inorganic Hybrid Materials: Prehistory, Art, Science, and Advanced Applications

Cited by 302 publications

References 382 publications

Hybrid Sol–gel Coatings for Corrosion Mitigation: A Critical Review

Hybrid Sol–gel Coatings for Corrosion Mitigation: A Critical Review

Synthesis and characterization of Ti-/Zr-diphenylpropanedione complexes and their application in the ring opening polymerization of Ɛ-caprolactone

Mechanism on The Disproportionating Synthesis of Dichlorodimethyl‐ silane by ZSM‐5(5 T)@γ‐Al2O3 Series Core‐Shell Catalysts

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Product

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Mechanism on The Disproportionating Synthesis of Dichlorodimethyl‐ silane by ZSM‐5(5 T)@γ‐Al₂O₃ Series Core‐Shell Catalysts