Tungsten has the characteristics of high temperature resistance, high strength, high hardness and low thermal expansion coefficient. It is an irreplaceable key material in many fields, especially in the field of national defense, military industry and aerospace. However, its high density (too heavy) limits its application, so it is necessary to develop new lightweight materials with better comprehensive properties than tungsten.

Among the two-dimensional transition metal sulfides, single-layer nano-tungsten disulfide is a typical sandwich layered structure. Because of its relatively weak van der Waals force between layers, it can also be peeled into single or few layers of nanosheets. It is considered to be another important two-dimensional nanosheet material besides graphene, which has unique physical, chemical and electrical properties.

The case of the girl in Yueqing, Zhejiang Province, who was killed by the drip and the wind, has aroused the attention of people from all walks of life. The occurrence of this case also reminded people of the Zhengzhou flight attendant’s car murder case three months ago. For a time, the voice of the question about the Drip Trip platform on the Internet was soaring. This also sounded the alarm of self-protection for the majority of female friends! We should still learn how to protect ourselves. Not only do we need to pay attention when we take a taxi, but we should also improve our vigilance at any time. After all, danger is everywhere, and it is impossible to prevent it! In order to be in distress, not only fear, Sun Tzu’s art of war tells us that it is necessary to have a plan to prepare for it! Below, mainly from three points to talk about how girls should defend themselves.

Tungsten hexafluoride, a chemical formula of WF₆, is a colorless gas. When condensed, it is a pale yellow liquid with a molar mass of 297.83 g/mol, which is one of the most dense gases. Among tungsten tungsten fluorides, tungsten hexafluoride is the only stable and industrially produced variety.

The stainless steel used for bipolar plate will be passivated in the weak acidic working environment of PEMFC. The passivation film formed slows down the further corrosion of stainless steel, but also increases the contact resistance between passivation film and carbon paper. The research shows that the carbon-based coating can be used to modify the composition, structure and surface defects of passivation film and form a compact passivation film with high corrosion resistance. And enhance the conductivity and thermal conductivity.

Tungsten oxide is an important transition metal oxide semiconductor with excellent electrochromic, photochromic and field emission properties. It has important application prospects in the fields of solar energy utilization, intelligent display, visible light photocatalysis, chemical sensing and so on.

Potassium phosphotungstate (K₃PW₁₂O₄₀) is a kind of Heteropoly acid. Potassium phosphotungstate, as a cathode active material in the molecular cluster of Heteropoly acid, has attracted much attention due to its reversible multi-electron redox reaction, which enables it to achieve a high specific capacity of 260 Ah/kg (ordinary Li₂CoO₂ lithium ion battery is 150 Ah/kg) and fast charge-discharge performance.

With the development of modern science and technology, higher requirements are put forward for the preparation of tungsten, tungsten alloys and tungsten compounds. Tungstate is an important intermediate material in tungsten smelting, and its preparation and technological research have important value and significance.

Photocatalysis can effectively convert light energy into chemical energy. Bi₂WO₆, as a new visible light-responsive photocatalytic material, has a narrow band gap (2.7eV), good photocatalytic activity under ultraviolet and visible light, and can effectively degrade organic pollutants in wastewater.

In the field of industrial production, metal wear is one of the main causes of failure of mechanical parts, such as material conveying systems in metallurgy, coal, power, waterway dredging and other industries, parts wear very seriously. Wear not only causes great loss of materials, but also causes the shutdown of production and affects the normal operation of production line. Therefore, the research and development of high wear resistant materials has been paid attention by material workers.