Superoleophobic nanocomposite coatings with improved hydrophobic properties were obtained by incorporation of a perfluoroalkyl polymer in hybrid sol-gel matrix containing silica and titania nanoparticles. SiO2 and TiO...Superoleophobic nanocomposite coatings with improved hydrophobic properties were obtained by incorporation of a perfluoroalkyl polymer in hybrid sol-gel matrix containing silica and titania nanoparticles. SiO2 and TiO2 nanoparticles were synthesized based on sol-gel precursors utilizing tetraethyl orthosilicate, 3-glycidoxypropyl trimethoxysilane, and tetra (n-butyl orthotitanate). SEM and EDX images of the coating demonstrated that a Silica nanosphere had been aggregated in superporous structure. The analysis results show that nano-sized inorganic particles (10 - 20 nm) have a uniform distribution and dispersion. By increasing the PFOTES, the oleophobicity of coatings increased due to lowering of surface energy in the presence of fluoropolymer. Results of EIS measurement show that PFOTES and TiO2 nanoparticles increased anti-corrosion property of hybrid coatings. This method introduces a simple way to produce water- and oil-repellent self-cleaning coatings on large areas of different substrates like glass, ceramic, metal and composites.展开更多
Hematite pigment has a long history,but it cannot be used for ceramic application,because it must be thermally and chemically stable at high firing temperature when using a pigment in a glaze or ceramic body.Recently,...Hematite pigment has a long history,but it cannot be used for ceramic application,because it must be thermally and chemically stable at high firing temperature when using a pigment in a glaze or ceramic body.Recently,through encapsulated systems,a new pigment with suitable thermal and chemical stability can be obtained by encapsulating hematite crystals into selected silica or zircon matrices.It means that nano-sized red hematite has been encapsulated into the protected phases.Transmission electron micrographs of hematite encapsulated into silica and zircon matrices by sol-gel method show spherical single crystals with diameter of about 5-10 nm.In order to optimize ceramic glaze formulations for application of the synthesized red inorganic nanocomposite inclusion pigment by sol-gel method,four different types of glazes(i.e.,alkalis,borate,earth alkalis,and leaded glazes)have been tested.The results show that the substitution of a fraction of zircon by cristobalite in hematite-zircon pigment produces acceptable stability with red hue.展开更多
文摘Superoleophobic nanocomposite coatings with improved hydrophobic properties were obtained by incorporation of a perfluoroalkyl polymer in hybrid sol-gel matrix containing silica and titania nanoparticles. SiO2 and TiO2 nanoparticles were synthesized based on sol-gel precursors utilizing tetraethyl orthosilicate, 3-glycidoxypropyl trimethoxysilane, and tetra (n-butyl orthotitanate). SEM and EDX images of the coating demonstrated that a Silica nanosphere had been aggregated in superporous structure. The analysis results show that nano-sized inorganic particles (10 - 20 nm) have a uniform distribution and dispersion. By increasing the PFOTES, the oleophobicity of coatings increased due to lowering of surface energy in the presence of fluoropolymer. Results of EIS measurement show that PFOTES and TiO2 nanoparticles increased anti-corrosion property of hybrid coatings. This method introduces a simple way to produce water- and oil-repellent self-cleaning coatings on large areas of different substrates like glass, ceramic, metal and composites.
文摘Hematite pigment has a long history,but it cannot be used for ceramic application,because it must be thermally and chemically stable at high firing temperature when using a pigment in a glaze or ceramic body.Recently,through encapsulated systems,a new pigment with suitable thermal and chemical stability can be obtained by encapsulating hematite crystals into selected silica or zircon matrices.It means that nano-sized red hematite has been encapsulated into the protected phases.Transmission electron micrographs of hematite encapsulated into silica and zircon matrices by sol-gel method show spherical single crystals with diameter of about 5-10 nm.In order to optimize ceramic glaze formulations for application of the synthesized red inorganic nanocomposite inclusion pigment by sol-gel method,four different types of glazes(i.e.,alkalis,borate,earth alkalis,and leaded glazes)have been tested.The results show that the substitution of a fraction of zircon by cristobalite in hematite-zircon pigment produces acceptable stability with red hue.
