Effect of iron oxide coatings on zinc sorption mechanisms
... of 15 mM. The pH was adjusted to 5 to prevent polymerization. A synthetic mixed Zn–Al layered double hydroxide (LDH) reference was prepared at pH 6.3 using the method of Taylor [33]. The final precipitate had a Zn:Al ratio of 1.7 based on total dissolution of the solid and measurement of dissolved Z ...
... of 15 mM. The pH was adjusted to 5 to prevent polymerization. A synthetic mixed Zn–Al layered double hydroxide (LDH) reference was prepared at pH 6.3 using the method of Taylor [33]. The final precipitate had a Zn:Al ratio of 1.7 based on total dissolution of the solid and measurement of dissolved Z ...
3 In Situ STM Studies of Model Catalysts
... transition metals are usually selected to prepare STM tips. In the presence ofreactant gases, especially under high.pressure and high-temperatur;;: conditions, the chem ical and thermal stability of the STM tip becomes the ultimate limit for reaction studies and thus the major concern in tip select ...
... transition metals are usually selected to prepare STM tips. In the presence ofreactant gases, especially under high.pressure and high-temperatur;;: conditions, the chem ical and thermal stability of the STM tip becomes the ultimate limit for reaction studies and thus the major concern in tip select ...
Immobilization of Metal Hexacyanoferrate Ion
... cubic structure with thin channels (close to 3.2 Å) [6]: this size is compatible with the diffusion of small hydrated ions like Cs+ , K+ , NH4 + while the diffusion is hindered for metal ions with largest hydrated radius such as Na+ , Ca2+ , etc. The recovery of target metal can also proceed through ...
... cubic structure with thin channels (close to 3.2 Å) [6]: this size is compatible with the diffusion of small hydrated ions like Cs+ , K+ , NH4 + while the diffusion is hindered for metal ions with largest hydrated radius such as Na+ , Ca2+ , etc. The recovery of target metal can also proceed through ...
Microwave Synthesis of Cuprous Oxide Micro
... Qingwei Zhu1) , Yihe Zhang1,3)† , Jiajun Wang2) , Fengshan Zhou1) and Paul K. Chu3) 1) State Key Laboratory of Geological Processes & Mineral Resources, National Laboratory of Mineral Materials, School of Materials Science and Technology, China University of Geosciences (Beijing), Beijing 100083, Ch ...
... Qingwei Zhu1) , Yihe Zhang1,3)† , Jiajun Wang2) , Fengshan Zhou1) and Paul K. Chu3) 1) State Key Laboratory of Geological Processes & Mineral Resources, National Laboratory of Mineral Materials, School of Materials Science and Technology, China University of Geosciences (Beijing), Beijing 100083, Ch ...
DOE Chemistry 1
... DOE Category A reactor training managers determined which materials should be included, and served as a primary reference in the initial development phase. Training guidelines from the commercial nuclear power industry, results of job and task analyses, and independent input from contractors and ope ...
... DOE Category A reactor training managers determined which materials should be included, and served as a primary reference in the initial development phase. Training guidelines from the commercial nuclear power industry, results of job and task analyses, and independent input from contractors and ope ...
Modern inorganic chemistry
... We now know of the existence of over one hundred elements. A century ago, more than sixty of these were already known, and naturally attempts were made to relate the properties of all these elements in some way. One obvious method was to classify them as metals and non-metals; but this clearly did n ...
... We now know of the existence of over one hundred elements. A century ago, more than sixty of these were already known, and naturally attempts were made to relate the properties of all these elements in some way. One obvious method was to classify them as metals and non-metals; but this clearly did n ...
IOSR Journal of Electrical and Electronics Engineering (IOSR-JEEE) ISSN: 2278-1676
... Fig. 2 An experimental setup for the synthesis of titanium dioxide (TiO2) nanoparticles by anodization The close packed titanium was attached to a copper rod to form the working electrode. The titanium rod was protected by a non-conductive epoxy in order to avoid being anodized in the electrolyte. A ...
... Fig. 2 An experimental setup for the synthesis of titanium dioxide (TiO2) nanoparticles by anodization The close packed titanium was attached to a copper rod to form the working electrode. The titanium rod was protected by a non-conductive epoxy in order to avoid being anodized in the electrolyte. A ...
TiO2-graphene oxide nanocomposite as advanced photocatalytic
... In our previous work [8], we reported on nonstoichiometric TiO2-graphene oxide nanocomposite, which was prepared by thermal hydrolysis of suspension with graphene oxide nanosheets and titania peroxo-complex. It should be mentioned that we are able to produce pure graphene nanosheets in large quantit ...
... In our previous work [8], we reported on nonstoichiometric TiO2-graphene oxide nanocomposite, which was prepared by thermal hydrolysis of suspension with graphene oxide nanosheets and titania peroxo-complex. It should be mentioned that we are able to produce pure graphene nanosheets in large quantit ...
BARIUM NITRATE
... The product, black ash, is a gray or black powder containing carbonaceous impurities and unreacted barite. Barium sulfide is separated from impurities by extraction with hot water and filtration. It is obtained as an aqueous solution of 15 to 30% strength. The commercial product is 80% to 90% BaS. B ...
... The product, black ash, is a gray or black powder containing carbonaceous impurities and unreacted barite. Barium sulfide is separated from impurities by extraction with hot water and filtration. It is obtained as an aqueous solution of 15 to 30% strength. The commercial product is 80% to 90% BaS. B ...
Types of Casting
... of parting compound to prevent the plaster from sticking to the pattern. The plaster is then poured over the pattern and the unit shaken so that the plaster fills any small features. The plaster sets, usually in about 15 minutes, and the pattern is removed. The mold is then baked, between 120 °C (24 ...
... of parting compound to prevent the plaster from sticking to the pattern. The plaster is then poured over the pattern and the unit shaken so that the plaster fills any small features. The plaster sets, usually in about 15 minutes, and the pattern is removed. The mold is then baked, between 120 °C (24 ...
Atomic Layer Deposition of Metal Fluorides Using HF−Pyridine as
... Metal fluorides are important optical coating materials because they have a low refractive index and high transmission at ultraviolet (UV) and infrared (IR) wavelengths.1−3 Some metal fluorides also have strong Lewis acidity and are used as heterogeneous catalysts for the manufacture of chlorofluorocar ...
... Metal fluorides are important optical coating materials because they have a low refractive index and high transmission at ultraviolet (UV) and infrared (IR) wavelengths.1−3 Some metal fluorides also have strong Lewis acidity and are used as heterogeneous catalysts for the manufacture of chlorofluorocar ...
Catalysts Containing Depleted Uranium Compounds
... air conditions. Catalysts based on uranium salts are easy for recycling, whereas reaction products can be readily purified. It has been revealed that complexes of U4+ è U6+ are bright coloured, readily forming acilated ions, not forming complexes with ketones and aromatic esters. A possible mechanis ...
... air conditions. Catalysts based on uranium salts are easy for recycling, whereas reaction products can be readily purified. It has been revealed that complexes of U4+ è U6+ are bright coloured, readily forming acilated ions, not forming complexes with ketones and aromatic esters. A possible mechanis ...
Rubidium
... It occurs naturally in the minerals leucite, pollucite, and zinnwaldite, which contains traces of up to 1% of its oxide. Lepidolite contains 1.5% rubidium and this is the commercial source of the element. Some potassium minerals and potassium chlorides also contain the element in commercially signif ...
... It occurs naturally in the minerals leucite, pollucite, and zinnwaldite, which contains traces of up to 1% of its oxide. Lepidolite contains 1.5% rubidium and this is the commercial source of the element. Some potassium minerals and potassium chlorides also contain the element in commercially signif ...
Transition metal oxides ∓ Thermoelectric properties
... gradient and vice versa. TE materials are widely regarded as the materials that can provide potential solutions for power generation and refrigeration technologies as well as their future advancements [1–4]. Additionally, they offer opportunities for the development of technologies in areas such as ...
... gradient and vice versa. TE materials are widely regarded as the materials that can provide potential solutions for power generation and refrigeration technologies as well as their future advancements [1–4]. Additionally, they offer opportunities for the development of technologies in areas such as ...
PHOSPHORUS AND SULFUR COSMOCHEMISTRY
... life. Theories on the origin of life are confounded by a lack of reactive phosphorus, and attempts to overcome the dearth of reactive phosphorus must employ unrealistic phosphorus compounds, energetic organic compounds, or unusual physical conditions. Meteoritic schreibersite provided an abundant so ...
... life. Theories on the origin of life are confounded by a lack of reactive phosphorus, and attempts to overcome the dearth of reactive phosphorus must employ unrealistic phosphorus compounds, energetic organic compounds, or unusual physical conditions. Meteoritic schreibersite provided an abundant so ...
Unfamiliar Oxidation States and Tkeir Stabilization
... studies. In some instances a combination of two or more of these has been necessary for the complete characterization of the oxidation state in question. Analytical data, in conjunction with a study of the chemical properties of the substance, frequently give sufficient information for the determina ...
... studies. In some instances a combination of two or more of these has been necessary for the complete characterization of the oxidation state in question. Analytical data, in conjunction with a study of the chemical properties of the substance, frequently give sufficient information for the determina ...
I Ceramic Material Classes - Wiley-VCH
... Ceramic oxides represent the most extensive group of ceramic materials produced today. Traditionally, but rather artificially, the oxide ceramics are divided into traditional and advanced groups. The traditional ceramics include mostly silica-based products prepared from natural raw materials ( ...
... Ceramic oxides represent the most extensive group of ceramic materials produced today. Traditionally, but rather artificially, the oxide ceramics are divided into traditional and advanced groups. The traditional ceramics include mostly silica-based products prepared from natural raw materials ( ...
Properties of Oxide Surfaces
... is 12-fold coordinated by oxygen, which are located on the faces. The B cation, which is usually a transition metal ion, occupies the center of the cube (Figure 15.2c). The corundum structure (MrO3, e.g., ÆrO¡, FerOr) is reaiized by fllling twothirds of the octahedral sites in an hcp lattice of oxyg ...
... is 12-fold coordinated by oxygen, which are located on the faces. The B cation, which is usually a transition metal ion, occupies the center of the cube (Figure 15.2c). The corundum structure (MrO3, e.g., ÆrO¡, FerOr) is reaiized by fllling twothirds of the octahedral sites in an hcp lattice of oxyg ...
The Cryosphere Modelling snowdrift sublimation on an Antarctic ice
... capture this process. This negatively affects the representation of the SMB by these models. Schlosser (1999) concluded that the limited agreement between her atmospheric model and observations on the accumulation rates at Neumayer (Fig. 1) could be related to the absence of representation of the sn ...
... capture this process. This negatively affects the representation of the SMB by these models. Schlosser (1999) concluded that the limited agreement between her atmospheric model and observations on the accumulation rates at Neumayer (Fig. 1) could be related to the absence of representation of the sn ...
Comparison between High-Velocity-Air-Fuel- (HVAF) and Cold
... Wire Flame Spray as well as High-Velocity-Oxy-Fuel- (HVOF) and High-Velocity-Air-Fuel-(HVAF)spray ...
... Wire Flame Spray as well as High-Velocity-Oxy-Fuel- (HVOF) and High-Velocity-Air-Fuel-(HVAF)spray ...
(131904) Topic: Fracture of Metal Temperature Embrittlement
... many metals. Even very small amount of hydrogen can cause cracking in steel and titanium. It may be introduced during melting and entrapped during solidification, or it may be picked up during heat treatment, acid pickling, electroplating or welding. ...
... many metals. Even very small amount of hydrogen can cause cracking in steel and titanium. It may be introduced during melting and entrapped during solidification, or it may be picked up during heat treatment, acid pickling, electroplating or welding. ...
Ductile fracture
... many metals. Even very small amount of hydrogen can cause cracking in steel and titanium. It may be introduced during melting and entrapped during solidification, or it may be picked up during heat treatment, acid pickling, electroplating or welding. ...
... many metals. Even very small amount of hydrogen can cause cracking in steel and titanium. It may be introduced during melting and entrapped during solidification, or it may be picked up during heat treatment, acid pickling, electroplating or welding. ...
View paper - Andrew J. Gellman Research Group
... catalytic sites or for adsorption. If these surfaces can be prepared such that they have chiral structures, then catalysis or adsorption on them can be enantiospecific and can lead to enantioselectivity. This paper discusses the possible origins of chirality at the surfaces of solid materials and me ...
... catalytic sites or for adsorption. If these surfaces can be prepared such that they have chiral structures, then catalysis or adsorption on them can be enantiospecific and can lead to enantioselectivity. This paper discusses the possible origins of chirality at the surfaces of solid materials and me ...
hydrogen storage
... high specific surface area, hydrogen intercalation in metals and complex hydrides, and storage of hydrogen based on metals and water are reviewed. ...
... high specific surface area, hydrogen intercalation in metals and complex hydrides, and storage of hydrogen based on metals and water are reviewed. ...
Flux (metallurgy)
In metallurgy, a flux (derived from Latin fluxus meaning “flow”) is a chemical cleaning agent, flowing agent, or purifying agent. Fluxes may have more than one function at a time. They are used in both extractive metallurgy and metal joining.Some of the earliest known fluxes were carbonate of soda, potash, charcoal, coke, borax, lime, lead sulfide and certain minerals containing phosphorus. Iron ore was also used as a flux in the smelting of copper. These agents served various functions, the simplest being a reducing agent which prevented oxides from forming on the surface of the molten metal, while others absorbed impurities into the slag which could be scraped off the molten metal.As cleaning agents, fluxes facilitate soldering, brazing, and welding by removing oxidation from the metals to be joined. Common fluxes are: ammonium chloride or rosin for soldering tin; hydrochloric acid and zinc chloride for soldering galvanized iron (and other zinc surfaces); and borax for brazing or braze-welding ferrous metals. In the process of smelting, inorganic chlorides, fluorides (see fluorite), limestone and other materials are designated as ""fluxes"" when added to the contents of a smelting furnace or a cupola for the purpose of purging the metal of chemical impurities such as phosphorus, and of rendering slag more liquid at the smelting temperature. The slag is a liquid mixture of ash, flux, and other impurities. This reduction of slag viscosity with temperature, increasing the flow of slag in smelting, is the original origin of the word flux in metallurgy. Fluxes are also used in foundries for removing impurities from molten nonferrous metals such as aluminum, or for adding desirable trace elements such as titanium.In high-temperature metal joining processes (welding, brazing and soldering), the primary purpose of flux is to prevent oxidation of the base and filler materials. Tin-lead solder (e.g.) attaches very well to copper, but poorly to the various oxides of copper, which form quickly at soldering temperatures. Flux is a substance which is nearly inert at room temperature, but which becomes strongly reducing at elevated temperatures, preventing the formation of metal oxides. Additionally, flux allows solder to flow easily on the working piece rather than forming beads as it would otherwise.The role of a flux in joining processes is typically dual: dissolving of the oxides on the metal surface, which facilitates wetting by molten metal, and acting as an oxygen barrier by coating the hot surface, preventing its oxidation. In some applications molten flux also serves as a heat transfer medium, facilitating heating of the joint by the soldering tool or molten solder.Fluxes for soft soldering are typically of organic nature, though inorganic fluxes, usually based on halogenides and/or acids, are also used in non-electronics applications. Fluxes for brazing operate at significantly higher temperatures and are therefore mostly inorganic; the organic compounds tend to be of supplementary nature.