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Application of TiO2 Nanotubes in Denitrification Field

TiO2 nanotubes have a high specific surface area (greater than 300m2/g). The specific surface area of ​​the catalyst has an important influence on the catalytic performance, so TiO2 nanotubes were used as the denitration catalyst carrier, and the manganese oxide/TiO2 nanotube denitration catalyst was prepared by loading manganese oxide by the equal impregnation method. The catalyst showed good low temperature denitration. performance, especially in the temperature range of 100-220 °C, the denitration activity is almost 100%.

Manganese oxide has relatively high catalytic activity in low-temperature denitration (electrons on 3D orbitals are very easy to migrate). Using TiO2 nanotubes with high specific surface as a carrier can improve the dispersion of manganese oxide and promote more catalytically active sites. At the same time, the mass transfer process of the reaction is improved; on the other hand, TiO2 nanotubes have strong anti-sulfur poisoning ability. In addition, the active sites of amorphous manganese oxide in the catalyst were uniformly dispersed on the surface of the carrier and the increase of Lewis acid content jointly promoted the improvement of catalyst performance.

The application of TiO2 nanotubes with large specific surface area in the catalytic reaction of low-temperature denitration is of great significance to expand the field of denitration.

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Silicon carbide whiskers can significantly improve the service life of resin diamond grinding wheels

The diamond grinding wheel uses diamond abrasive as raw material, and uses metal powder, resin powder, ceramics and electroplated metal as binders respectively. The circular bonded abrasive tool with a through hole in the center is called diamond grinding wheel (alloy grinding wheel).

The resin-bonded diamond grinding wheel generally has a low life and cannot meet the requirements of advanced numerical control machine tools. The short life is mainly due to the poor wear resistance of the resin bond itself or the low holding force on the diamond, which causes the diamond abrasive particles to fall off prematurely during the grinding process. Therefore, how to improve the wear resistance of the resin bond and improve the holding force of the resin on the diamond has become the key to improving the service life of the resin bond diamond grinding wheel.

The addition of silicon carbide whiskers can greatly improve the strength, hardness, heat resistance, polishing, etc. of the bond and the grinding wheel. Silicon carbide whiskers have unique mechanical and physicochemical properties such as high hardness, high strength (toughness), and excellent wear resistance, so they are widely used in metals, ceramics, plastics, etc.

Strengthening and toughening of materials and composite materials to improve the strength of composite materials and prevent shrinkage and deformation. The shape of silicon carbide whiskers is like needles, especially its Webster hardness is close to diamond and has good toughness and wear resistance, and compared with abrasive grains, even if the diameter is the same as the grain size of abrasive grains, there are whiskers of a certain length that are combined with The agent has a relatively large bonding area and bonding strength, which greatly improves the service life of the grinding wheel.

The β-type micron-sized silicon carbide whiskers produced by Hongwu Nano have the characteristics of high purity and good morphology, and are the preferred materials for strengthening and toughening of various metal-based, ceramic-based and resin-based composite materials. Its strengthening and toughening effect and scope of application are unmatched by other materials.

Beta silicon carbide whiskers are needle-like single crystals. As an atomic crystal, it has low density, high melting point, high strength, high modulus, low thermal expansion rate, and excellent characteristics such as wear resistance, corrosion resistance, high temperature resistance, oxidation resistance, etc. It is mainly used for metal base, ceramic base , Reinforcement and toughening of resin-based composite materials, significantly improve the properties of composite materials.

Its main physical performance indicators are as follows:
Whisker diameter Diameter: 0.1-2.5um
Whisker Length: 10-50um
Density: 3.2g/cm2
Hardness: 9.5 Mobs
Modulus Modulus: 480GPa
Tensile Strength Strength of extension: 20.8Gpa
Tolerable temperature: 2960℃

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Perovskite Solar Cell Based on Nickel Dioxide

As an important device of renewable energy, solar cell has been the topic among people. However, the limited efficiency of traditional silicon-based solar cells restricts the application range of solar energy. In recent years, perovskite solar cell, as a new type of high-efficiency solar cell material, has the potential of high efficiency and low manufacturing cost, and has been paid attention by scientists. Nickel dioxide nanopowder(HW-S672) plays an important role in perovskite solar cells.

Solar cell is device that convert solar energy directly into electricity and is a kind of green and clean energy. Although the efficiency of traditional silicon-based solar cells continues to improve, the wide application is restricted due to the high cost of preparation. As a new type of solar cell material, perovskite solar cell has the advantages of high efficiency and low cost, and is considered to be an important direction for the development of solar cells in the future.

The working principle of the NiO2-based perovskite solar cell is to use the photosensitive nature of the perovskite structure to convert light energy into electricity. Perovskite is a kind of compound with special structure, which can achieve high efficiency photoelectric conversion. As the electrode material of the battery, nickel dioxide can provide good electron transport performance and electrical conductivity, which can help electrons transfer from the photosensitive layer to the electrode, and provide an effective electron collection channel, thus improving the efficiency of the solar cell.

The preparation methods of perovskite solar cells based on NiO2 mainly include solution method, vapor deposition method and solid phase method. Solution method is more commonly used. In the process of preparation, it is necessary to select suitable precursor, solvent and control reaction conditions, and prepare perovskite thin films by chemical reaction of solution and subsequent heat treatment.

In addition, nickel dioxide also has excellent optical properties, which can increase the light absorption capacity of perovskite solar cells and improve the photoelectric conversion efficiency. By combining its excellent electron transport performance and optical properties, nickel dioxide can facilitate the photoelectric conversion process of perovskite solar cells.

As a new kind of high efficiency solar cell material, perovskite solar cell has a broad application prospect. First of all, its preparation cost is relatively low. It can be produced in large scale to reduce the cost of solar cells. Secondly, perovskite solar cell based on nickel dioxide has high photoelectric conversion efficiency and can make full use of solar energy resources. In addition, the material also has good stability and long life, and can adapt to different application environments.

In summary, NiO2-based perovskite solar cell has a wide range of application prospects. Scientists are also conducting experiments to explore its infinite possibilities. It is believed that in the future, scientists will step by step further study the properties and preparation methods of the material, promote the development of solar cells, and contribute to the solution of energy problems.

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The Nano Powders for Preparing Special Ceramics

Special ceramics refer to ceramic materials with special properties and specific applications. Compared with traditional ceramics, special ceramics have higher hardness, wear resistance, high temperature resistance, corrosion resistance, and insulation performance, and are widely used in various fields, including aerospace, electronics, medical, energy, chemical, etc.

 

Nano powder can play an important role in the preparation of special ceramics. By adding nano powders to the raw materials of special ceramics, the microstructure control and performance optimization of materials can be achieved. Nano powder has large specific surface area and size effect, which can enhance the mechanical properties, thermal conductivity, optical properties of special ceramics, and improve the processing properties and density of materials.

 

The following are several nano powders commonly used to prepare special ceramics:

 

Nano zirconia powder (HW-U702): With excellent mechanical properties, wear resistance, and chemical stability, it is suitable for preparing wear-resistant and corrosion-resistant special ceramics, such as cutting tools and ceramic coatings.

 

Nano alumina powder (HW-N611): With high hardness, heat resistance, and chemical stability, it can be used to prepare high-temperature ceramic materials, such as ceramic aviation engine components and high-temperature resistant electronic devices.

 

Nano tin oxide powder (HW-X678): With good conductivity and optical properties, it can be used to prepare transparent conductive ceramic materials, such as touch screens, displays, and solar cells.

 

Nano tungsten oxide powder (HW-W691): With high density, high melting point, and excellent wear resistance, it is suitable for preparing high-temperature and wear-resistant ceramic materials, such as cutting tools, bearings, and valve guides.

 

These special ceramic materials have extensive applications in many fields, including electronics, medical, aerospace, energy, and automotive industries. Their unique performance makes them suitable for various extreme environments and applications that require high durability.