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.

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