Articles

04 5月

Membrane electrode catalyst carrier Ti4O7 for fuel cell reactor

(1) Preparation of Ti4O7: As a catalyst support, it needs to have a large specific surface area, and the difficulty lies in this. The specific surface area of Ti4O7 synthesized by single step method is very small. The specific surface area of multistep synthesis was 140m2/g. (2) Catalyst performance: The activity and durability of Ti4O7 supported catalyst is better than that of Pt/C catalyst. After the formation of Ru-Pt core-shell structure, the Ti4O7 supported catalyst not only has CO resistance, [...]

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29 4月

A spongy porous Fe-doped modified potassium vanadium phosphate

As the society attaches great importance to green and environmental protection, new electrochemical energy storage technologies are constantly updated. Lithium-ion batteries, due to their high energy density, high safety, light weight and long life, occupy a large market share in electrochemical energy storage technologies, such as new energy vehicles, mobile phones and power tools. However, with the widespread use of lithium-ion batteries, its disadvantages are becoming more and more apparent Due to the scarcity of lithium resources, high price and low [...]

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25 4月

Lithium aluminum hydride reduction cyanide why accident

Two 1mol reduction reactions of the following compound 10 were carried out. The reaction operation was very standard, which was called argon flow. The whole reaction process was maintained at about 5 degrees Celsius, and the reaction was monitored after several hours of stirring. One of the 8L reactors was quenched with ice methanol. As soon as the first drop of methanol was added, an orange flame immediately appeared in the reactor and exploded. The reactor was destroyed, the [...]

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16 4月

Molybdenum disulfide nanoflower-MoS2 nanosheet

The layered MoS2 nanoflower samples with the size of 1-2 microns were successfully prepared by hydrothermal synthesis. Each MoS2 nanoflower was formed by a large number of intersecting MoS2 nanoflakes in a regular center polymerization. In addition, we also used a simple two-step hydrothermal method to prepare high purity heterogeneous nanoflowers,MoS2 nanoflowers uniformly covered with Sn02 nanoparticles -MoS2@SnO2 heterogeneous nanoflowers, which enriched the heterogeneous structure system based on MoS2. The lattices and morphologies of MoS2 nanoflowers and MoS2@SnO2 heterogeneous nanoflowers [...]

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12 4月

Gadolinium zirconate material for thermal barrier coatings

Advanced aero-engine technology is one of the important symbols of a country’s scientific and technological level, industrial base and comprehensive national strength. In order to improve the performance of aeroengine, higher requirements should be put forward for turbine inlet gas temperature. Generally speaking, the temperature at the front inlet of a first-stage turbine with a thrust-to-weight ratio of 10 is about 1,950 K, and the temperature at the front inlet of a first-stage turbine with a thrust-to-weight ratio of [...]

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08 4月

Ytterbium disilicate coating can extend the life of jet engines

Aircraft manufacturers and their government and industrial customers have designed new aircraft engines that can operate at extremely high temperatures, meaning the engines can generate more energy while burning less fuel. Haydn Wadley, Edgar Starke Professor of Materials science and engineering at the University of Virginia’s School of Engineering and Applied Science, and Jeroen Deijkers, a postdoctoral research associate in Wadley’s group, have found a way to greatly extend the useful life of these engine materials. A jet engine draws in [...]

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04 4月

Preparation method of nanometer molybdenum trioxide

1. Hydrothermal synthesis method in the closed reactor, the 4∶1(molar ratio) molybdic acid and laurel gum reaction to molybdic acid molecules on the technology of amine, reaction temperature is 150℃, time is 1 day, at this time the light yellow molybdic amine compound turned white, cold to room temperature, aging 48h after the release of products, and then with 33% nitric acid aqueous solution, at room temperature 48h, remove the amine combination The pure nanometer molybdenum trioxide fiber was [...]

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30 3月

Using ultrasonic technology to reduce the cost of magnesium diboride superconductor

Superconductivity already has a variety of practical applications, such as medical imaging and maglev trains. However, in order to apply superconductors to other technologies, we need to not only improve performance, but also reduce the difficulty and cost of manufacturing. In this regard, magnesium diboride (MgB2), as a superconductor with multiple advantages, has attracted the attention of researchers since its discovery. It is a lightweight, easy to process material that can be made from a wide range of prerequisite materials, [...]

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24 3月

Method for preparing zirconium silicide nanomaterials

Zirconium silicide (zrsi), as a zirconium-silicon intermetallic compound, is a kind of high temperature ceramic material with high hardness, high melting point, high conductivity, high thermal conductivity and excellent thermal shock resistance. In view of these superior physical and chemical properties of zirconium-silicon intermetallic compounds, it is a kind of structural materials or new engineering materials that can be applied to high temperature corrosive media. At present, The method of preparation of zirconium silicide is mainly with silicon thermal reduction [...]

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20 3月

Nano titanium diboride reinforced aluminum alloy composites

Nano-titanium diboride particle reinforced aluminum matrix composites, TiB2p/Al has excellent mechanical and physical properties, such as high specific strength and specific modulus, wear resistance, fatigue resistance, low density, good dimensional stability, etc. Moreover, compared with continuous fiber reinforced composite materials, it has a significant low-cost advantage. The materials are isotropic, easy to process, flexible and diverse preparation, and can be manufactured by traditional equipment for secondary processing, such as extrusion, calendering and forging. Nano-titanium diboride particle reinforced aluminum matrix composite [...]

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