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An article and form technology, applied in the field of shaped articles, which can solve problems such as reducing specific surface area
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Embodiment 1
[0034] The solid phase is a mixture of α-tricalcium phosphate (α-TCP), calcium sulfate dihydrate (CSD), calcium carbonate (CC) and magnesium hydrogen phosphate trihydrate (MgP). The liquid phase is a solution of disodium hydrogen phosphate 0.5M and ethanol 99.9%. The L / P ratio was 0.43ml / g (Table 1).
[0035] Table 1: Composition of three samples BCD1, BCD3 and BCD5
[0036] sample
α-TCP[g]
CSD[g]
MgP[g]
CC[g]
NaP[ml]
BtOH [ml]
dH 2 O[ml]
BCD1
3.63
0.37
0.019
0.060
0.702
0.035
1.017
BCD3
3.63
0.37
0.057
0.180
0.728
0.109
0.985
BCD5
3.63
0.37
0.095
0.300
0.756
0.189
0.945
[0037] Each cement (20 batches, total = 80 g) was prepared under laminar flow conditions by adding the pre-mixed and sterilized powder to the ultrafiltrate in smaller autoclaved beakers. The paste is homogenized for 4 to 5 seconds with a spatula and directed...
Embodiment 2
[0048] The solid phase was α-TCP (8 g), CC (8 g), calcium dihydrogen phosphate monohydrate (0.8 g), deionized water (7.21 ml) and D-mannitol particles (17 g, in the range of 0.25 to 0.5 mm sieved) mixture. The liquid phase consisted of 7.21 ml of deionized water. Each cement (20 batches, total = 33.8 g x 20 = 676 g) was prepared under laminar flow conditions, involving the addition of premixed and sterilized powders to the ultrafiltrate in smaller autoclaved beakers. The paste was homogenized for 45 seconds with a spatula and channeled into large cylinders of 30 ml (pre-autoclaved). The shape was then introduced into a 100 ml container (pre-autoclaved), which was closed with a lid and incubated in an oven at 90° C. for 1 day. 50ml of deionized water was then added to the 100ml vessel and incubated at 90°C for an additional day (to dissolve the mannitol particles and pores in the cement structure). Then, the liquid was decanted and the cylinder was dried at 80° C. under vacu...
Embodiment 3
[0051] The solid phase is α-TCP (4g), CC (1g) and 0.1g disodium dihydrogen pyrophosphate (Na 2 h 2 P 2 o 7 )mixture. The powder was mixed upside down (Turbula mixer) for 1 hour and compressed into a cylinder (diameter 10 mm; length: 3.8 cm (60% apparent density)). The cylinder was placed in an atmosphere of 100% relative humidity at 125°C for 6 hours. Drying was carried out at the same temperature but under dry conditions. The cylinder is sterilized by gamma irradiation. Its specific surface area is 86m 2 / g, the compressive strength is 65Mpa. The average size of the nanopores is 90 nm, 99% of which are larger than 10 nm.
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