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Transmission Electron Microscope (TEM) Transmission electron microscopy uses an electron beam that penetrates a sample to image, which requires the sample being observed to be "transparent" to the incident electron beam. Transmission electron microscopy is widely used in materials science and biology. Since electrons are easily scattered or absorbed by objects, the penetration is low, and the dens...
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This is a method of synthesizing boron nitride by reacting borax and ammonium chloride as the main raw materials in an ammonia atmosphere. The two raw materials should be dehydrated and recrystallized separately before participating in the reaction. Borax is best dehydrated in a vacuum at 200~400°C. The recrystallization of ammonium chloride is to dissolve it into a saturated solution, filter to r...
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The synthesis of boron nitride by nitridation with boron anhydride (B4O3) is one of the important methods for industrial production of boron nitride. Due to the low melting point of boron anhydride (glass state is 294°C, crystalline state is 450-600°C), it becomes a high-viscosity melt at the nitriding temperature, which hinders the flow of ammonia and makes the reaction slow and extremely incompl...
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In summer, the sun is strong, and the sunlight enters the room through the glass, causing the temperature in the car to rise sharply, which seriously affects the comfort of living and vehicle riding. Among them, the energy in the infrared band accounts for the largest proportion, and it is also the main source of energy for the temperature increase in the place where the sunlight is irradiated. By...
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Glass thermal insulation coating is a kind of coating prepared by one or more nano powder materials. The nano materials used have special optical properties, that is, they have high blocking rate in the infrared region and ultraviolet region. , has a high transmittance in the visible region. Using the transparent and heat-insulating properties of the material, it is mixed with an environmentally f...
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Nano thermal insulation coatings can be used to absorb ultraviolet rays from sunlight, and are often used in current decoration buildings. Water-based nano transparent thermal insulation coating not only has the effect of high efficiency and energy saving, but also has the comprehensive advantages of green environmental protection, health and safety. As an alternative product of solvent-based glas...
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Infrared light has an obvious thermal effect, which can easily lead to an increase in ambient temperature. Ordinary architectural glass has no thermal insulation effect, and can only be achieved by means of filming. Therefore, architectural glass, car film, outdoor facilities and other surfaces need to use thermal insulation materials to achieve the effect of thermal insulation and energy saving. ...
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With the low-carbon economy becoming a global hotspot, energy-saving materials are increasingly favored by people. In building energy conservation, the light transmission and heat insulation of glass is a very critical issue. In buildings with large areas of exterior windows and transparent ceilings, car windows and other occasions, the thermal radiation of sunlight will lead to an increase in the...
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The promotion and application of energy-saving technologies has reached a consensus in the world, and many countries have successively issued policies. In building energy consumption, a large proportion is lost through glass doors and windows. Similarly, in the hot summer, the exposure of sunlight through the car glass is unbearable for drivers and passengers, which accelerates the aging of the ve...
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In the world of electronic materials there are two important material properties "electrical conductivity" and "thermal conductivity". Generally speaking, as long as the electrical conductivity of the material is good enough, the thermal conductivity is also good. For example, copper, silver, aluminum and other metal materials have good electrical and thermal conductivity. Therefore, most metal ma...
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In the process of powder storage, transportation and use, it is often hoped that the nano-aluminum powder exhibits low activity and is less affected by external environmental factors (temperature, humidity, etc.), so that the product has stable performance for a long time. On the other hand, it is desirable to exhibit high activity in solid rocket propellants to obtain high energy release rate and...
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Boron carbide, also known as black diamond, is an inorganic substance with a chemical formula of B4C, usually a gray-black micropowder. It is one of the three hardest known materials (after diamond and cubic boron nitride) and is used in tank armor, body armor and many industrial applications. It has a Mohs hardness of about 9.5. Black glossy crystals. The hardness is lower than that of industrial...
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