The crystallization of Hydroxyapatite in the presence of sodium alginate
| Autor: | Evangelos Dalas, P. Malkaj, E. Pierri |
|---|---|
| Rok vydání: | 2005 |
| Předmět: |
Materials science
Alginates Surface Properties Kinetics Biomedical Engineering Biophysics Biocompatible Materials Bioengineering Crystal growth law.invention Biomaterials chemistry.chemical_compound Adsorption Glucuronic Acid stomatognathic system law Materials Testing Mole Computer Simulation Crystallization Surface diffusion Supersaturation Hexuronic Acids Glucuronic acid Crystallography Durapatite Models Chemical chemistry Bone Substitutes Nuclear chemistry |
| Zdroj: | Journal of Materials Science: Materials in Medicine. 16:733-737 |
| ISSN: | 1573-4838 0957-4530 |
| DOI: | 10.1007/s10856-005-2610-9 |
| Popis: | The effect of sodium alginate on the crystal growth of hydroxyapatite (HAP) was investigated at sustained supersaturation by the constant composition technique. Sodium alginate was found to inhibit HAP crystal growth at low concentrations and reduced the crystal growth rates by 42–86% for inhibitor concentrations of 2.1 × 10− 7–12.6 × 10− 7 mol/l. The inhibition effect on the crystal growth rate may be explained possibly through adsorption onto the active growth sites. A detailed kinetics analysis suggested a Langmuir-type adsorption of the alginate on HAP surface and a value of 1.63 × 107 l/mol was obtained for the affinity constant of sodium alginate for the surface of HAP. The apparent order for the crystallization reaction was determined to be approximately 2, thus suggesting a surface diffusion controlled spiral growth mechanism. |
| Databáze: | OpenAIRE |
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