Cobalt

A catalyst layer is usually the slimmest layer in a PEM fuel cell; however this is an extremely complex component because of its porosity, several phases, and reactions (Spiegel 2008). An efficient catalyst layer should provide several functions at the same time; transporting the electron and the proton, supplying oxygen and hydrogen and water management. The structure and composition of the catalyst layer affects all these roles. Optimization of the catalyst layer can provide for all these…

investigated via means of methylation, as such using the Chloro(pyridine)cobaloxime as a model for replicating chemistry already known of cyano(pyridine)cobaloxime. These various Models for Vitamin B12 (right) all pivot on the known data that the octahedral cobalt central atom and it’s cyanide ligand are responsible for such methylation. Cyano(pyridine)cobaloxime (left) was one of the first stable complexes…

Nearly most of camera lens is made of glass. Now some manufacturers adopt sapphire to make camera lens. Compared with glass, the biggest advantage of sapphire is its hardness. It's nearly twice as hard as standard glass, and nearly as hard as diamond. The extremely high hardness means it is nearly impossible to scratch it. Sapphire also have a compressive strength of 2,000MP, about ten times that of stainless steel, which means it is extremely strong. Those attributes can guarantee the optics of…

Trailblazer. However, Kelley’s allegations and involvement in the case caused him to be removed from his position and reassigned to another division, effectively ending his career advancement goals with GM. In 2014, the case resurfaced when GM recalled the Cobalt for faulty ignitions, the successor to the Cavalier, a car Kelley managed in the early 2000’s. Although Kelley did his best to be a whistleblower in the case and get GM to recall vehicles, he might have been able to do more to help the…

Lithium originates from the Greek word, “lithos,” meaning stone, because at least a small amount of lithium is found in every rock (The Element Lithium, 1). In fact, roughly 0.0007 of the crust of the earth is made up of lithium. At a refined state, it is a malleable, silver-gray metal, which is reactive, flammable, and easily corroded in exposure to moist air (Lithium: historical information, 1). Other characteristics of lithium create specific and productive uses for this element. Lithium has…

was the environment the material originated from. However, the bovine pericardium is not nearly as durable as the pyrolytic carbon and can cause the valve to fail more easily due to calcification of the tissue or damage caused by continuous wear. Cobalt-chromium is used for the stent because it is a durable but still somewhat flexible material that allows the artificial valve to function more closely to that of the original tissue. A disadvantage to this alloy is the material will start to…

hard to rip. The type of physicality of the coin would be color, texture, and weight. Other physical properties for a suitable coin would be the density of the coin. The type of chemical properties for a suitable coin would be copper, nickel, and cobalt. The reason for this is because it is very strongly made and also it is made to last for a while. There are no other chemical properties for a suitable coin that we could find, I’m sure there are some out there but my partner and I couldn’t find…

temperature i.e. 300K with the increase in Cr concentration from 0.0 to 1.0 as summarized in Table 1 and is evident from fig.2. These values clearly signify that the resistivity in Co-Cr nano ferrites is increased by nearly 40 times to that of pure Cobalt ferrite with increase in dopant (Cr) concentration from 0.0 to 1.0. Co-Cr nano ferrites with such high resistivity that leads to very low eddy current losses are desirable in electronic inductors, transformers and electromagnets. The variation…

can be easily casted, corrosion resistant and reproduce fine detail. Moreover, it has high electrical conductivity at high temperatures. To introduce Beryllium into metals, Beryllium alloys of magnesium-aluminum, aluminum, nickel, copper, iron or cobalt are always used (Hornbostel, 1991). According to Harper (2001), Beryllium oxide, with a melting point of 2585 °C and specific gravity of 3.025, is a cubic close-packed and has a zinc blende structure. It is stable in dry atmospheres. At high…

The goal of this laboratory project was to identify the unknown compound and thoroughly investigate it to find its physical and chemical properties which reveal the way it might behave. This was done by performing many anion, cation, solubility, and pH tests to help us to determine the identity of our compound. The list of salts in the lab manual made it possible to narrow down the possibilities of our unknown compound. After identifying the compound, the goal was to synthesize the unknown…