Tourmaline is also called Tomalin. Tomalin was first discovered in Sri Lanka. People noticed that this gemstone carries electric charge when heated. This phenomenon is called pyroelectric effect, so it is named tourmaline.
Tourmaline is a multi-element natural mineral. It is mainly consists of mor…
Yttrium, chemical symbol Y. It is the first rare earth metal element to be discovered. It is a grey ferrous metal with ductility. It reacts with hot water and is soluble in dilute acid. Special glass and alloy can be made.Yttrium is a rare earth element. Rare earth elements refer to scandium, yttriu…
Nano-anion powder is elaborately made from natural materials through nanotechnology. Scientific research shows that nano-anion powder is of great help to keep energetic and improve human living environment.The main uses of nano-anion powder are as follows:
(1) The negative ions in the purified air…
Graphene is one of the materials with the highest strength known. At the same time, it has good toughness and can be bent. The theoretical Young's modulus of graphene is as high as 1.0 tpa, and its intrinsic tensile strength is 130 GPa. Graphene paper made from graphene sheets has a number of pores…
Vanadium is a malleable metal, but vanadium containing oxygen, nitrogen or hydrogen is brittle. Vanadium is a poor conductor of electricity and its conductivity is only one-tenth that of copper. At room temperature, fine vanadium is stable to oxygen, nitrogen and hydrogen. When heated in air, vanadi…
The platinum powder with micron size is spherical and polygonal. Chloroplatinic acid solution was obtained by dissolving sponge platinum in aqua regia, adjusting acidity, adding dispersant, heating and stirring, adding reductant (hydrazine hydrate, etc.), static cooling, washing and drying. 0.5 m ul…
Fe-Si-Al alloy is an alloy powder of 85% Fe, 9% Si and 6% Al, which is processed by special process and pressed into ring or E-type magnetic powder cores. It is commonly called Kool M_ u magnetic powder cores or Sendust magnetic powder cores in the market.
Because of its high hardness and resistivi…
Nanometer iron oxide is a multifunctional material. When the size of iron oxide particles is small to nanometer scale (1-100 nm), the number of surface atoms, specific surface area and surface energy of iron oxide particles increase sharply with the decrease of particle size, which shows the charact…
Beryllium sulfate is a kind of white powder or cubic crystalline crystals, soluble in water, insoluble in organic solvents, highly toxic, and highly carcinogenic substance. It can cause dermatitis, ulcer and skin granuloma after absorption by human body. Industrial applications include beryllium sal…
Cobalt hydroxide chemical formula Co(OH)2. It is a rose-red monoclinic or tetragonal crystal, insoluble in water, slightly amphoteric, insoluble in strong alkali, but soluble in acid and ammonium salt solution. The melting point is 1100-1200 C , which is amphoteric hydroxide.Cobalt hydroxide has the…
