Hydroxylapatite Powder
|
Crystal form |
Purity(%) |
Particle Size(nm) |
Application |
|
Acicular |
96 |
60 |
toothpaste, mouthwash, land restoration |
|
Acicular |
96 |
40 |
Protein separation, chromatography |
|
Acicular |
95 |
200 |
toothpaste, mouthwash, land restoration |
|
Acicular |
97.5 |
20 |
Artificial bone |
|
Acicular |
99 |
L150, W20 |
Artificial bone |
|
Short-rod |
99 |
L100, W30 |
Artificial bone, artificial joint |
|
Fibrous |
99 |
L500, W10 |
Artificial bone, artificial joint |
|
Spherical |
99 |
12um |
Artificial bone coating |
|
Acicular |
96 |
12um |
Food, toothpaste |
|
Spherical |
|
80um |
land restoration |
|
Spherical |
|
30-80um |
artificial bone coating, thermal spraying |
|
Spherical |
|
50um |
Bone nails, Bone scaffold |
|
Spherical |
|
15-30um |
3D Printing, thermal spraying |
|
Spherical |
|
100um |
3D Printing, thermal spraying |
The theoretical composition of hydroxyapatite is CA10 (PO4) 6 (OH) 2 and Ca / P is 1.67. However, due to the influence of preparation process, its real composition is quite complex. HA crystal belongs to hexagonal system, belongs to l6pc symmetry type and p63 / M space group. Its structure is hexagonal column, and the plane perpendicular to c axis is a hexagon with an angle of 120 ° between a and B axes. Its unit cell parameters are a = 9.43 ~ 9.38 Å, C = 6.88 ~ 6.86 Å, z = 2. The unit cell contains 10 Ca2 +, 6 PO43 - and 2 Oh -. There are several possible surface states on HA microcrystalline surface: (1) when Oh is located on the crystal surface, oh is connected with two Ca (Ⅱ) ions. When HA is in aqueous solution, the oh position on the surface is vacant at least for a certain moment Ca (Ⅱ) ions are positively charged, forming an adsorption site, which can adsorb PO43 - or phosphate or carboxyl groups on macromolecules. (2) When Ca ion is located on the surface of the crystal, because Ca (I) is connected with six negatively charged O atoms, when ha In aqueous solution, when the Ca (I) site on the surface is vacant at a certain moment, a strong adsorption site is formed at the Ca (I) site, which can adsorb cations such as SR3 +, K + and protein molecules, while a weak adsorption site is formed at the Ca (II) position. (3) When PO43 - is located on the surface of the crystal, H2O binds to PO43 - ion through hydrogen bond.