According to foreign media reports, material scientists at the University of Hamburg, Germany, and the University of Hamburg, Germany, have recently developed the world's lightest material, which is called "aerographite." This material weighs only 0.2 milligrams per cubic centimeter, 4 times lighter than the previous lightest material record creator, 6 times lighter than air, and 5,000 times less dense than water. The Aerographite is so light that it is difficult to use it to carry out research work in a normal laboratory. Any slight wind in the laboratory will blow it away. Researcher Matthias Mecklenburg said: “A kilogram of this material is 5 cubic meters, which means it has to occupy a base of 1 square meter and its height is 5 meters, just like a The house or a tower." Aerographite is a reticulated carbon tube with a diameter of about 15 nanometers. The material is made by placing zinc oxide crystals in a special oven and then heating them to 900 degrees Celsius. Due to its lightness and relatively large surface area, aerographite can be used to develop much lighter lithium-ion batteries, waterproof clothing, lighter computers, air purifiers, water purification equipment and satellite protection screens. (Shang Li) The transmission range of Zinc Selenide ZnSe-CVD is 0.5 - 20 µm.
Special care should be taken when handling Zinc Selenide as it is a toxic material. Always wear rubber or plastic gloves to avoid risk of contamination.
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ZnSe CVD used for high power CO2 laser optics at 10.6µm, for protective optics windows or optical elements in FLIR (forward looking infrared) thermal imaging equipment, optics for medical and industrial applications (optical plane parallel windows (plates, disks, blanks), wedged windows, optical meniscus, spherical and cylindrical lenses, prisms, resonator mirrors of CO2 laser).
The refractive index is near 2.4. Zinc Selenide has a very low absorbtion coefficient and is used extensively for high power infrared laser optic. It is non-hygroscopic.
Zinc Selenide (ZnSe) - transparent in wide spectral range from yellow (visible) to far IR. ZnSe material is a chemically inert, non-hygroscopic and highly pure product that is very effective in many optical applications due to its extremely low bulk losses, high resistance to thermal shock and stability in virtually all environments, easily machined.
