92 results about "Aragonite" patented technology

Disclosed is a novel form of particulate precipitated aragonite, and a novel process for producing it.

This invention provides aragonite- and calcite-based scaffolds for the repair, regeneration, enhancement of formation or a combination thereof of cartilage and / or bone, which scaffolds comprise at least two phases, wherein each phase differs in terms of its chemical content, or structure, kits comprising the same, processes for producing solid aragonite or calcite scaffolds and methods of use thereof.

A coating solution comprising: (A) an aragonite-type light calcium carbonate microparticle having an average major axis diameter of 1.0 to 2.8 [mu]m and an average minor axis diameter of 0.15 to 0.3 [mu]m, which is produced by diluting a calcium hydroxide slurry that has been treated by high-speed shearing until the slurry has a viscosity of 1000 cP or more at a concentration of 400 g / l to a concentration more than 50 g / l and then blowing carbon dioxide into the diluted slurry at a reaction starting temperature of 20 to 60 DEG C and at a rate of 1 to 3 I / min per kg of calcium hydroxide; and (B) a pigment comprising a wet heavy calcium carbonate cake. The coating solution enables to provide a coated paper having an excellent degree of brilliance and an excellent degree of whiteness, despite containing no kaolin.

The invention relates to a method for distinguishing pearl powders from shell powders, comprising the following steps: the pearl powders and the shell powders are calcined and then respectively mixed with potassium bromide to be made into transparent flakes, then the infrared spectrum of the transparent flakes is measured under the conditions of resolution of 4 cm<-1> and scanning for 16 times with the scanning range of 400-4000 cm <-1>, the pearl powders and the shell powders are distinguished according to the characteristic peak of 701.0 cm <-1>, 1082.1 cm <-1>, 2919.3 cm<-1> and 3468.5 cm <-1>; as organic substances in the calcined pearl powders are partially decomposed, the crystal type of calcium carbonate changes from the aragonite type to the calcite type, and the calcium carbonatestarts to decompose; the organic substances in the shell powders are almost totally decomposed, the aragonite type calcium carbonate is totally converted into the calcite type calcium carbonate, and the calcium carbonate does not start to decompose into calcium oxide yet, therefore, the method can be used for distinguishing the pearl powders from the shell powders. Compared with the prior distinguishing method, the method can simply, rapidly and effectively distinguish the pearl powders from the shell powders with obvious phenomenon.