2022-11-19
2023-11-06The flotation method is one of the conventional mineral purification methods that consumes less energy and reagents, and has a lower cost. This is a major advantage of the flotation method for purifying graphite. However, using flotation to purify graphite can only achieve a limited increase in its grade. For flake graphite, using multi-stage grinding not only cannot completely dissociate its monomer, but also is not conducive to protecting the large scale of graphite. Therefore, using flotation to further improve graphite grade is neither economical nor scientific. To obtain high carbon graphite with a carbon content of over 99%, chemical methods must be used to purify the graphite.（1） Chlorination roasting method. The low roasting temperature and low chlorine consumption of the chlorination roasting method significantly reduce the production cost of graphite. At the same time, the carbon content of graphite products is equivalent to that after treatment with hydrofluoric acid, and t
2023-11-02Graphene makes indoor people feel like they are in a windless "warm winter sun", with both heating and health care. Unlike traditional heating equipment such as air conditioners, oil heaters, and underfloor heaters, graphene heating paintings are more comfortable, energy-efficient, non boring, noiseless, neither oxygen deficient nor light pollution, and are a classic masterpiece of technological change.In addition to covering and insulating the body, traditional clothing only has value left, and there are few high-tech products that appear. Through skill discussions, medical expert Zhiren has independently developed high-tech intelligent heating clothing in the application field of graphene electric heating film, targeting extremely cold areas, outdoor people in winter and spring, people with weak physique, and people who love beauty in winter. The graphene composite film is made into an efficient conductive, thermal conductive, and flexible heating core, which is perfectly
2023-11-02Graphene has excellent optical properties, with an absorption rate of about 2.3% over a wide wavelength range, making it almost transparent. Within the thickness range of several layers of graphene, with each increase in thickness, the absorption rate increases by 2.3%. Large area graphene films also have excellent optical properties, and their optical properties change with the thickness of graphene. This is an unusual low energy electronic structure possessed by single-layer graphene. At room temperature, a voltage is applied to a double-gate double-layer graphene field-effect transistor, and the bandgap of graphene can be adjusted between 0 and 0.25 eV. When a magnetic field is applied, the optical response of graphene nanoribbons can be tuned to the terahertz range.When the intensity of the incident light exceeds a certain critical value, graphene's absorption reaches saturation. These characteristics allow graphene to be used as a passive mode-locked laser. This unique absorption
2023-11-01Graphene already exists in nature, but it is difficult to peel off a single layer structure. Graphene is stacked layer by layer to form graphite, with a thickness of 1 millimeter containing approximately 3 million layers of graphene. A pencil lightly scratches on paper, leaving traces that may be several or even just one layer of graphene.The carrier mobility of graphene at room temperature is about 15000 cm2/(V · s), which is more than 10 times that of silicon material and more than twice that of the known material indium antimonide (InSb) with the highest carrier mobility. Under certain specific conditions, such as low temperature, the carrier mobility of graphene can even reach up to 250000 cm2/(V · s). Unlike many materials, the electron mobility of graphene is less affected by temperature changes. At any temperature between 50 and 500K, the electron mobility of single-layer graphene is around 15000 cm2/(V · s).In addition, the semi integer quantum Hall effect of electron carriers
2023-11-01Graphene is a type of ² A new material in which hybrid connected carbon atoms are tightly packed into a single-layer two-dimensional honeycomb lattice structure. Graphene has excellent optical, electrical, and mechanical properties, and has important application prospects in materials science, micro/nano processing, energy, biomedical, and drug delivery. It is considered a revolutionary material in the future. Andre Geim and Konstantin Novoselov, physicists from the University of Manchester, UK, successfully separated graphene from graphite by micromechanical stripping method, so they jointly won the 2010 Nobel Prize in Physics. The common methods for producing graphene powder are mechanical stripping, redox, SiC epitaxial growth, and the film production method is chemical vapor deposition (CVD).Graphene has special significance for fundamental research in physics, as it enables some quantum effects that could only be theoretically demonstrated to be experimentally verified. In two-di
2023-10-31How to achieve the flame retardant effect of expanded graphite? The good physical and chemical structure of expanded graphite is widely used in industry. There are many applications that use the flame retardancy of expanded graphite, which has a good flame retardant effect. How can the effect be achieved? Today, the editor will explain how the flame retardant effect of expanded graphite can be achieved:1. Expanded graphite can generate many lightweight refractory carbon layers in fires, effectively isolating the radiation source of heat value onto the substrate and maintaining the substrate.2. Expanded graphite is an excellent conductor, and the prepared coating can avoid the accumulation of static charges, prevent fire, and prevent static electricity.3. Adding expanded graphite to coating materials can obtain flame-retardant and anti-static coatings, improving resistance to heat and fire characteristics.Starting from thermodynamic and surface chemistry issues, the adsorption mechanis
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