Record-breaking Metal Materials May Bring A Revolution In Optical Technology
The new ultra-thin non-ferrous metal can focus visible light to infrared wavelengths through tiny, connected waveguides.
The new ultra-thin non-ferrous metal can focus visible light to infrared wavelengths through tiny, connected waveguides.
Fumed silica is an artificial substance, so it’s no surprise that it’s known by multiple names—Diatomaceous earth, Diatomaceous silica, Diatomite, Silicon dioxide (amorphous), and Vitreous silica, at least. In fact, before 1989, its official name was silica (amorphous). Today, however, industry and regulators tend to call the substance fumed silica—not to be confused with silica fume, which is an industrial byproduct quite different from fumed silica. Fumed silica is a beneficial industrial chem
Boron nitride nanomesh is a nanostructured two-dimensional material. It consists of a single BN layer, which forms a highly regular mesh by self-assembly after high-temperature exposure of a clean rhodium or ruthenium surface to borazine under an ultra-high vacuum. The nanomesh looks like an assembly of hexagonal pores. The distance between two pore centers is 3.2 nm, and the pore diameter is ~2 nm. Other terms for this material are boro nitrene or white graphene. The boron nitride nanomesh is s
Ordinary Portland cement is commonly used, but rapid-hardening cement can be used if necessary. Foam concrete can incorporate a wide range of cement and other combination, for example, 30 percent of cement, 60 percent of fly ash, and limestone in 10 percent. The content of cement range from 300 to 400 kg/m3. Sand for Foam Concrete: The maximum sand size used is 5mm. Use finer sands up to 2mm with the amount passing through a 600-micron sieve ranging from 60 to 95%. Pozzolanas: Supplementary ceme