| Autor: |
Sezanova, K., Tepavitcharova, S., Rabadjieva, D., Gergulova, R., Ilieva, R. |
| Předmět: |
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| Zdroj: |
AIP Conference Proceedings; Dec2013, Vol. 1569 Issue 1, p433-436, 4p, 1 Black and White Photograph, 2 Graphs |
| Abstrakt: |
The effect of biomimetic synthesis method, reaction medium and further precursor treatments on the chemical and phase composition, crystal size and morphology of calcium phosphates was examined. Nanosized calcium phosphate precursors were biomimetically precipitated by the method of continuous precipitation in three types of reaction media at pH 8: (i) SBF as an inorganic electrolyte system; (ii) organic (glycerine) modified SBF (volume ratio of 1:1); (iii) polymer (10 g/l xanthan gum or 10 g/l guar gum) modified SBF (volume ratio of 1:1). After maturation (24 h) the samples were lyophilized, calcinated at 300°C for 3 hours, and washed with water, followed by new gelation, lyophilization and step-wise (200, 400, 600, 800, and 1000°C, each for 3 hours) sintering. The reaction medium influenced the chemical composition and particle size but not the morphology of the calcium phosphate powders. In all studied cases bi-phase calcium phosphate fine powders with well-shaped spherical grains, consisting of ß-tricalcium phosphate (ß-TCP) and hydroxyapatite (HA) with a Ca/P ratio of 1.3- 1.6 were obtained. The SBF modifiers decreased the particle size of the product in the sequence guar gum ~ xanthan gum < glycerin < SBF medium [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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