On October 27, 2017, the International Agency for Research on Cancer (IARC) of the World Health Organization (WHO) released a preliminary reference for the list of carcinogens. Arsenic and inorganic arsenic compounds are included in the list of Category 1 carcinogens. Read More »

Cadmium telluride (CdTe) is an important group ⅱ-ⅵ compound semiconductor material with black crystalline particles or powders, melting point of 1092℃, relative molecular weight of 240, crystal structure of sphalerite type, with direct transition type band structure. The lattice constant is 0.6481nm, the bandgap width is 1.45eV, the electron mobility at room temperature is 1050 C ㎡/(Vs), and the hole mobility at room temperature is 80 C ㎡/(Vs). Read More »

Titanium dioxide (TiO2)​, commonly known in industry, titanium dioxide, is also a typical semiconductor photocatalyst. Calcium carbonate (CaCO3) is a common inorganic nonmetal powder, widely used filler. The preparation of composite photocatalyst (CAT-CC) by supporting nano-tio2 with calcium carbonate particles as a carrier can improve the function of TiO2 by reducing the particle size and improving the particle dispersion. Read More »

Tungsten​ is a transition metal element with abundant reserve resources in the world. Tungsten-based materials are generally characterized by high inherent density (>7g·cm-3), abundant frame structure, low price and easy availability, so they have been used in the fields of electrochemistry, photocatalysis and gas sensing. Read More »

The main component of iron sulfide, diamagnetic. Room temperature is an inactive substance. It becomes lively when the temperature rises. Read More »

As the most excellent comprehensive properties of structural ceramics material, silicon nitride in the high temperature, high speed, strong corrosive medium such as extreme environment with special application value, is considered to be one of the most development prospect of application of structure ceramic materials, in mechanical engineering, metallurgy, chemical industry, aerospace, biomedical, semiconductor and other industries are widely used. Read More »

Nanoparticles have the functions of high temperature resistance, high temperature resistance, high temperature resistance, high temperature resistance, oxidation resistance, good weather resistance, good weather resistance, and excellent performance. It involves two aspects of nanomaterials, which is a hot spot. It involves matter and matter. Read More »

Cadmium was discovered in 1817 by Strohmeier, a professor of chemical medicine at the University of Gottingen in Germany. In 1990, FAO and the World Health Organization divided trace elements into three categories. The first category is essential to human body, there are 8 kinds, including iodine, iron, zinc, selenium, copper, molybdenum, chromium and cobalt. Read More »

Tungsten trioxide, chemical formula: WO3, is the oxide of tungsten (VI), which is an important intermediate of tungsten industry from tungsten ore. Yellow powder, melting point: 1472℃, relative density (water =1) 7.16, boiling point 1837℃; Insoluble in water, soluble in lye, slightly soluble in acid. It can be obtained by adding acid after eumelting tungsten ore and soda. Read More »

As the lightest metal structure material, magnesium​ has broad application prospects in aerospace, automotive, high-speed rail, electronic products and medical and other fields. However, compared with traditional metal materials, magnesium has poor plasticity, difficult deformation processing of profiles and parts, and high process cost. This severely restricts the wide application of magnesium as a structural material. Read More »

Lithium iron phosphate​ has an olivine structure and is densely packed hexagonally (slightly twisted). LiFePO4 consists of FeO6 octahedron and PO4 tetrahedron to form a spatial skeleton. P occupies the tetrahedron position, while Fe and Li fill the octahedron gap. Fe occupies the coangular octahedron position, and Li occupies the coedal octahedron position. Read More »

Silicon nitride​ is a compound synthesized under artificial conditions. Although silicon nitride was synthesized directly more than 140 years ago, it was only remembered as a stable "refractory" nitride. After the Second World War, the rapid development of science and technology, the urgent need for high temperature resistance, high hardness, high strength, corrosion resistant materials. Read More »

Titanium is a chemical element, chemical symbol Ti, atomic number 22, in the periodic table of chemical elements in the fourth period, IVB group. It is a silver-white transition metal characterized by light weight, high strength, metallic luster and resistance to wet chlorine corrosion. The most common compound of titanium is titanium dioxide​, which is used to make white pigments. In the past, titanium ore was mined mainly for titanium dioxide. Read More »

Magnesium oxide was born in 1930s as a new material. In the early days of the founding of the People's Republic of China, due to the increasing demand of rubber products for magnesium oxide, a number of small workshop factories first emerged in Shanghai, but the production variety is relatively single. Until 1956 have developed light magnesium oxide and heavy magnesium oxide two specifications of varieties. Read More »

Stone paperrefers to a new material between paper and plastic, with large reserves and wide distribution of limestone mineral resources as the main raw material (calcium carbonate​ content of 70-80%), with polymer polymer as the auxiliary material (content of 20-30%), using the principle of polymer interface chemistry and characteristics of polymer modification, Made type polymer extrusion, blowing process Read More »