By LZH | 11 August 2023 | 0 Comments
The rare earth metal oxides and especially cerium dioxide CeO2
What is CeO2?
Nanocrystalline CeO2 powders of high sinterability have been successfully synthesized by a mimic alkoxide method, which employs alcohols as a solvent, cerium nitrate hexahydrate as a cerium source, and diethylamine (DEA) as a precipitant. Precipitation-participating anions (OH-) are generated via DEA hydrolysis with the cerium salt's molecular water. Calcination temperature and solvent-type effects on powder characteristics and sinterability are also investigated. One of the most promising alternatives for corrosion protection pretreatments is the sol-gel technology, which is environmentally unproblematic and compatible with the organic paints used in most applications. Within the sol-gel family, hybrid films are the most promising, but unfortunately, they can offer only barrier protection as long as they are crack-free and pore-free. To extend the protection offered by those materials in active corrosion protection, inhibitors that can induce the "self-healing" effect are required. Rare earth elements like cerium and lanthanum are versatile inhibitors. The corrosion protection mechanism offered by the cerium ions was widely studied, and it is generally accepted that cerium ions lead to the precipitation of cerium oxides and hydroxides, which hinder the cathodic reduction reaction. On the other hand, Ce3+ can be oxidized to Ce4+. These Ce4+ ions, due to their high oxidizing potential, can promote the superficial oxidation of the aluminum alloy to aluminum oxides conferring a natural protection layer.
TiO2-CeO2 Nanometric Powders Prepared by Sol-Gel Method
Nanometric powders in the TiO2-CeO2 system were synthesized using sol-gel methods aiming at corrosion inhibitor preparation. The precursors employed were Ti(OiPr)4 as TiO2 source and Ce(NO3)3.6H2O or (CH3CO2)3Ce.xH2O as CeO2 source. Several parameters were varied, like the cerium precursor (cerium nitrate or cerium acetate) and the TiO2:CeO2 molar ratios. Binary powders with TiO2:CeO2 = 4:1 or 1:1 molar ratios were prepared for both cerium sources. The obtained materials were dried overnight in the oven at 100 °C and then thermally treated for one h at 400 °C with a heating rate of 1 °C/min to eliminate the water and organic residues. In all cases, nanometric – predominantly amorphous – powders have been obtained, crystallizing after the one h thermal treatment at 400 °C. The only exception was recorded for the TiO2:CeO2 = 4:1 composition prepared from the Ce(NO3)3·6H2O precursor, which remained amorphous after the thermal treatment. Even though the primary particle sizes were ~ 4 – 5 nm, the material is constituted from aggregates larger than 50 nm. The desired presence of cerium in two valence states, necessary in active corrosion protection, was achieved, and it was put into evidence by XPS and DTA/TGA for the TiO2:CeO2 = 4:1 binary compositions. Future studies have to be done in order to reduce the agglomeration of the material.
The rare earth metal oxides and especially cerium dioxide CeO2
Metal oxides are important in many fields, such as electrochemistry, catalysis, gas sensing, corrosion protection, etc. In recent years, titanium dioxide (TiO2) has raised a large interest due to its non-toxicity, chemical stability, and low cost. Recently, applications of TiO2 films for cathodic protection of metals under ultraviolet (UV) illumination have been reported. Unfortunately, pure TiO2 coating cannot be used under dark conditions due to its charge recombination. On the other hand, rare earth metal oxides, especially cerium dioxide (CeO2), possess a relatively high reactivity and find applications in different fields, including corrosion protection. This is because cerium has an oxygen affinity, and the bonding between cerium and oxygen is unlikely to be broken by applied cathodic potentials. According to the literature data, TiO2-CeO2 powders and films were prepared for use as catalysts, electrochromic device materials], oxygen sensors, and several other applications. Even though TiO2, CeO2, and their binary powders are mostly discussed in the literature due to their catalytic behavior, in recent years, these oxides have found new applications as corrosion inhibition dopants for silica-based sol-gel corrosion protection coatings, which are considered environmentally friendly by comparison with the traditional chromate conversion coatings. Light materials with high weight/strength ratios gain importance in automotive and aeronautical industries due to the new concerns regarding low CO2 emissions. As a consequence, the use of magnesium, aluminum, and their alloys is continuously increasing, and the need to prevent and retard their natural deterioration process using environmentally compliant methods has become more and more evident. Replacing hazardous chromate conversion coatings constituted the object of many studies in the last period.
Price of CeO2
CeO2 particle size and purity will affect the product's Price, and the purchase volume can also affect the cost of CeO2. A large amount of large amount will be lower. The Price of CeO2 is on our company's official website.
CeO2 supplier
Luoyang Tongrun Nano Technology Co. Ltd. (TRUNNANO) Luoyang City, Henan Province, China, is a reliable and high-quality global chemical material supplier and manufacturer. It has more than 12 years of experience providing ultra-high quality chemicals and nanotechnology materials, including CeO2, nitride powder, graphite powder, sulfide powder, and 3D printing powder. If you are looking for high-quality and cost-effective CeO2, you are welcome to contact us or inquire at any time.
Nanocrystalline CeO2 powders of high sinterability have been successfully synthesized by a mimic alkoxide method, which employs alcohols as a solvent, cerium nitrate hexahydrate as a cerium source, and diethylamine (DEA) as a precipitant. Precipitation-participating anions (OH-) are generated via DEA hydrolysis with the cerium salt's molecular water. Calcination temperature and solvent-type effects on powder characteristics and sinterability are also investigated. One of the most promising alternatives for corrosion protection pretreatments is the sol-gel technology, which is environmentally unproblematic and compatible with the organic paints used in most applications. Within the sol-gel family, hybrid films are the most promising, but unfortunately, they can offer only barrier protection as long as they are crack-free and pore-free. To extend the protection offered by those materials in active corrosion protection, inhibitors that can induce the "self-healing" effect are required. Rare earth elements like cerium and lanthanum are versatile inhibitors. The corrosion protection mechanism offered by the cerium ions was widely studied, and it is generally accepted that cerium ions lead to the precipitation of cerium oxides and hydroxides, which hinder the cathodic reduction reaction. On the other hand, Ce3+ can be oxidized to Ce4+. These Ce4+ ions, due to their high oxidizing potential, can promote the superficial oxidation of the aluminum alloy to aluminum oxides conferring a natural protection layer.
TiO2-CeO2 Nanometric Powders Prepared by Sol-Gel Method
Nanometric powders in the TiO2-CeO2 system were synthesized using sol-gel methods aiming at corrosion inhibitor preparation. The precursors employed were Ti(OiPr)4 as TiO2 source and Ce(NO3)3.6H2O or (CH3CO2)3Ce.xH2O as CeO2 source. Several parameters were varied, like the cerium precursor (cerium nitrate or cerium acetate) and the TiO2:CeO2 molar ratios. Binary powders with TiO2:CeO2 = 4:1 or 1:1 molar ratios were prepared for both cerium sources. The obtained materials were dried overnight in the oven at 100 °C and then thermally treated for one h at 400 °C with a heating rate of 1 °C/min to eliminate the water and organic residues. In all cases, nanometric – predominantly amorphous – powders have been obtained, crystallizing after the one h thermal treatment at 400 °C. The only exception was recorded for the TiO2:CeO2 = 4:1 composition prepared from the Ce(NO3)3·6H2O precursor, which remained amorphous after the thermal treatment. Even though the primary particle sizes were ~ 4 – 5 nm, the material is constituted from aggregates larger than 50 nm. The desired presence of cerium in two valence states, necessary in active corrosion protection, was achieved, and it was put into evidence by XPS and DTA/TGA for the TiO2:CeO2 = 4:1 binary compositions. Future studies have to be done in order to reduce the agglomeration of the material.
The rare earth metal oxides and especially cerium dioxide CeO2
Metal oxides are important in many fields, such as electrochemistry, catalysis, gas sensing, corrosion protection, etc. In recent years, titanium dioxide (TiO2) has raised a large interest due to its non-toxicity, chemical stability, and low cost. Recently, applications of TiO2 films for cathodic protection of metals under ultraviolet (UV) illumination have been reported. Unfortunately, pure TiO2 coating cannot be used under dark conditions due to its charge recombination. On the other hand, rare earth metal oxides, especially cerium dioxide (CeO2), possess a relatively high reactivity and find applications in different fields, including corrosion protection. This is because cerium has an oxygen affinity, and the bonding between cerium and oxygen is unlikely to be broken by applied cathodic potentials. According to the literature data, TiO2-CeO2 powders and films were prepared for use as catalysts, electrochromic device materials], oxygen sensors, and several other applications. Even though TiO2, CeO2, and their binary powders are mostly discussed in the literature due to their catalytic behavior, in recent years, these oxides have found new applications as corrosion inhibition dopants for silica-based sol-gel corrosion protection coatings, which are considered environmentally friendly by comparison with the traditional chromate conversion coatings. Light materials with high weight/strength ratios gain importance in automotive and aeronautical industries due to the new concerns regarding low CO2 emissions. As a consequence, the use of magnesium, aluminum, and their alloys is continuously increasing, and the need to prevent and retard their natural deterioration process using environmentally compliant methods has become more and more evident. Replacing hazardous chromate conversion coatings constituted the object of many studies in the last period.
Price of CeO2
CeO2 particle size and purity will affect the product's Price, and the purchase volume can also affect the cost of CeO2. A large amount of large amount will be lower. The Price of CeO2 is on our company's official website.
CeO2 supplier
Luoyang Tongrun Nano Technology Co. Ltd. (TRUNNANO) Luoyang City, Henan Province, China, is a reliable and high-quality global chemical material supplier and manufacturer. It has more than 12 years of experience providing ultra-high quality chemicals and nanotechnology materials, including CeO2, nitride powder, graphite powder, sulfide powder, and 3D printing powder. If you are looking for high-quality and cost-effective CeO2, you are welcome to contact us or inquire at any time.
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