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electronic effect

Time：2023.09.25Browse：1: Share:

The load migration rate of graphene at room temperature is about 15000cm2/(v · s). This value exceeds 10 times the silicon material. More than twice. Under certain conditions such as low temperature, the load migration rate of graphene can even be as high as 250000cm2/(v · s). Unlike many materials, the electronic migration rate of graphene is less affected by temperature changes. At any temperature between 50 and 500K, the electronic migration rate of a single layer of graphene is about 15000cm2/(v · s).

In addition, the semi -integer quantity Hall effect of the electronic carrier and the cave carrier in the graphene can be observed by changing the chemical potential through the influence of the electric field, and scientists have observed the quantum Hall effect of graphene under room temperature conditions. Essence [9] The carrier in the graphene follows a special quantum tunnel effect, which will not produce back scattering when encountering impurities. reason. Neither electron and photons in graphene have no static quality, and their speed is a constant that has nothing to do with kinetic energy.

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2023-08-03

Purification method of graphite

The flotation method is one of the conventional mineral purification methods that consumes less energy and reagents, and has lower costs. This is a major advantage of the flotation method for purifying graphite. However, when using the flotation method to purify graphite, it can only achieve a limited improvement in the grade of graphite. For flake graphite, using multi-stage grinding not only cannot completely dissociate its monomers, but also is not conducive to protecting the large flakes of graphite. Therefore, using flotation to further improve the graphite grade is not economical or scientific. To obtain high carbon graphite with a carbon content of over 99%, it is necessary to use chemical methods to purify the graphite.（1） Chlorination roasting methodThe low roasting temperature and low chlorine consumption of the chlorination roasting method greatly reduce the production cost of graphite. At the same time, the carbon content of graphite products is equivalent to that after tr

2023-05-15

How to extract high -carbon graphite

The high -carbon graphite extraction method and the flotation method is low in the purity of minerals and the loss of reagents. This is the advantage of purifying high -carbon graphite. However, the application of floating and purifying graphite can only make the graphics of graphite unlimited improvement. For sheet -shaped graphite, not only can not solve its complete monomer, but it is not conducive to maintaining large hungusgogi. High carbon graphite must be chemically purified for graphite.(1) Pure method of high carbon alkali acidic acid. The carbon content purified by alkaline is more than 99%of the carbon content, which has the characteristics of less one -time investment, high product grade, and strong process adaptability. It also has a strong generality. The purity of non-metal minerals can use the advantages of alkali-acid method, and the alkali-acid method is the most commonly used method in my country today.(2) High -carbon graphite chloride and roasting method. The chlo

2023-03-22

Several factors of hot pressure graphite mold damage

1. Broken: Graphite mold directly contacts the matrix powder containing diamond. The contact surface is in a high pressure state. The hardness of diamond and graphite mold is too poor. The surface of the mold that is in contact with diamond tool head will produce concave pits.Second, the type of damage: During the sintering process, the matrix powder infiltrates into the oxidation gap of the graphite mold under the melting state, resulting in the adhesion between the tool head and the mold, making it difficult for molding. The repeated attack of the mold can remove the mold, which causes the lack of edges and metal pit in the mold.Third, the wear size of graphite molds is very poor: some substrate powder will be squeezed out of the mold surface in the melting state to attach to the graphite material. Before using the mold next time, metal residues must be removed manually, which causes the shape and size of the mold to exceed the tolerance.Fourth, surface oxidation and cracking: Becau

2023-07-20

Some related knowledge points of high pure graphite?

The applicable areas of high pure graphite include metallurgical, military, light industry, electrical battery industry, and fertilizer. It can be called high -purity graphite. In order to make more people familiar with it, here is some of the relevant knowledge points of Gao Chun graphite? I hope you can bring some better ones when you see it. Help.High -pure graphite is widely used in metallurgy, machinery, environmental protection, chemical, electronics, medicine, military, military and aerospace and other fields. Has high -purity, high -intensity graphite performance. In fact, the existence of graphite scales now makes graphite have excellent lubrication. Generally speaking, the larger the ordinary graphite scales, the better the lubricity. When we use it, we need to know that the graphite industry technology is still at a low level in the world. The products are mainly raw materials and initial processing products. Therefore, the high impurities of some products have limited its

2023-08-10

Will room temperature superconductivity become the next graphene

On July 22nd, a South Korean research team published a paper on the preprint website arXiv, claiming to have synthesized the world's first room temperature and atmospheric pressure superconductor, named LK-99.Superconductivity refers to superconductivity. Under normal temperature and pressure, almost all conductors have resistance, resulting in thermal energy loss during current conduction. Superconductors are materials that can conduct current with zero loss due to the disappearance of resistance, and have complete diamagnetism (internal magnetic induction strength is zero), with advantages such as stability, low loss, and fast transmission.Previously, superconducting materials needed to enter the superconducting state at lower temperatures. The keyword "room temperature superconductivity" mentioned by the Korean team in this paper refers to the phenomenon of superconductivity achieved under room temperature conditions. According to the standards of condensed matter physics

2023-10-08

Graphite anode usage

In an electrolytic cell, the current flowing into the electrolyte from this point is called a graphite anode plate. In the electrolysis industry, the anode is generally made into a plate shape, so it is called a graphite anode plate. It is widely used in ferries, wastewater treatment, industrial anti-corrosion equipment, or as a special material.Compared with other materials, graphite anode plates have advantages such as high temperature resistance, good conductivity and thermal conductivity, easy mechanical processing, good chemical stability, acid and alkali corrosion resistance, and low ash content; Used for electrolyzing aqueous solutions, producing chlorine, caustic soda, and electrolyzing salt solutions to produce alkali; For example, graphite anode plates can be used as conductive anodes for electrolysis of salt solution to produce caustic soda. Graphite anode plates can be used as conductive anodes in the electroplating industry, making them an ideal material for various elect

2023-03-21

How to maintain graphite processing into graphite stick products?

1. During the use of graphite stick products, the graphite stick products are turned once a week to extend the life of graphite stick products;2. Using an appropriate amount of combustion agent, additives will reduce the life of graphite sticks;3. Keep a proper distance between the graphite stick and the wall of the furnace, and the graphite stick products should be placed in the furnace positive;4. When removing the inside of the graphite rod product, the inside of the wall of the graphite and sticking should be tapped to prevent damage to damaging graphite rod products;5. Graphite products are strictly preventing humidity. They must be placed on a dry place or wooden stand during storage.

2023-08-16

Characteristics of Mechanical Processing of Carbon Materials

(1) The organizational structure of carbon materials is formed by the preparation of carbon solid aggregate particles and powder raw materials through a series of production processes, so its cutting is composed of a certain number of particles and dust. The large amount of carbon dust generated during the cutting process not only pollutes the operating environment and affects the health of operators, but also the silicon carbide impurities contained in graphite dust can cause certain wear and tear on machine tool components. Therefore, efficient ventilation and dust removal equipment must be installed in the mechanical processing workshop of carbon materials.(2) Carbon material is a heterogeneous and brittle material, with a considerable range of hardness fluctuations. Roasted carbon products have a high hardness, which makes processing more difficult. Graphite products have a low hardness, making them easy to cut and process. The surface roughness of products processed with carbon m

2023-12-14

Understand the graphitization of lithium battery negative electrodes in 5 aspects

What is graphitization? The so-called graphitization refers to the transformation of non graphite carbon into graphite carbon with a three-dimensional regular ordered structure after high-temperature heat treatment. Originating from the carbon product industry, it is a necessary process for producing graphite electrodes. The graphitization process is aimed at improving the

2023-03-28

What is the application scope of industrial graphite powder

With the rapid development of the world industry, graphite graphite powder has been regarded as one of the important industrial mineral raw materials at home and abroad. Especially in recent years, the development of science and technology has played an important role in all walks of life.

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