摘要:
The calcium-phosphate type hydroxyapatite is in the form of spherulites having a mean particle diameter of 0.5 to 50 µm and preferably 1 to 10 µm. The spherulites are aggregates mainly of acicular crystallites belonging to a series of hexagonal systems and having unit lattice constants of 9.58± 0.08 A (0.958±0.008 nm) for the a axis and 7.00 0.05 A (0.700±0.005 nm) for the c axis. The spherulitic hydroxyapatite is produced by granulating a calcium-phosphate type hydroxyapatite in the form of a gel and then firing the granular apatite at 400 to 700°C, preferably at 500 to 600 C and desirably in the presence of oxygen or air.
摘要:
The calcium-phosphate type hydroxyapatite is in the form of spherulites having a mean particle diameter of 0.5 to 50 µm and preferably 1 to 10 µm. The spherulites are aggregates mainly of acicular crystallites belonging to a series of hexagonal systems and having unit lattice constants of 9.58± 0.08 A (0.958±0.008 nm) for the a axis and 7.00 0.05 A (0.700±0.005 nm) for the c axis. The spherulitic hydroxyapatite is produced by granulating a calcium-phosphate type hydroxyapatite in the form of a gel and then firing the granular apatite at 400 to 700°C, preferably at 500 to 600 C and desirably in the presence of oxygen or air.
摘要:
An assemblage of hydroxyl apatite particles having small and uniform particle size is described. The median of the particles size is 1 to 10 µm, and at least 90 % of the particles in the assemblage have a particle size of not more than 25 µm. The assemblage has a use as a packing of a liquid chromatography column.
摘要:
An assemblage of hydroxyl apatite particles having small and uniform particle size is described. The median of the particles size is 1 to 10 µm, and at least 90 % of the particles in the assemblage have a particle size of not more than 25 µm. The assemblage has a use as a packing of a liquid chromatography column.
摘要:
A calcium-phosphate type hydroxyapatite belongs to a series of hexagonal systems having unit lattice constants of 9.58±0.08 A (0.0958±0.008 nm) for the a axis and 7.00±0.05 A (0.700±0.005 nm) for the c axis. Its Ca/P ratio is in the range of 1.50 to 1.90. Its principal use is as a column packing material for chromatographic separation of biopolymers. The hydroxyapatite is produced byfiring it in the form of a gel or powder at a temperature of 400° to 700°C. the gel having the form of a suspension or slurry. A powder, however, is prepared by removing moisture from the hydroxyapatite in the gel form and then drying. Either gel or powder can be fired by heating in the presence of oxygen or air at 500° to 600°C.