The effect of sodium and magnesium ions on the properties of calcium–phosphate biomaterials
| Autor: | L. P. Borilo, Elena A. Izosimova, Ekaterina S. Lyutova |
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| Rok vydání: | 2019 |
| Předmět: |
Sodium oxide
lcsh:Biotechnology Sodium 0206 medical engineering chemistry.chemical_element 02 engineering and technology Calcium nitrate law.invention Calcium–phosphate materials chemistry.chemical_compound law lcsh:TP248.13-248.65 Bound water Crystallization Magnesium ion Phosphoric acid Original Research 021001 nanoscience & nanotechnology Biomaterial 020601 biomedical engineering Magnesium nitrate chemistry General Earth and Planetary Sciences 0210 nano-technology Sol–gel synthesis Nuclear chemistry |
| Zdroj: | Progress in Biomaterials Progress in Biomaterials, Vol 8, Iss 2, Pp 127-136 (2019) |
| ISSN: | 2194-0517 2194-0509 |
| Popis: | A calcium–phosphate system was obtained by sol–gel method from 0.4 M solutions based on ethyl alcohol, tetraethoxysilane, phosphoric acid, calcium nitrate, and magnesium nitrate, sodium chloride. Compositions with different contents of CaO, Na2O, and MgO were prepared. After maturation of the solutions, heat treatments were applied at 60 °C for 30 min; and followed by 600 °C and 800 °C for 1 h. Solution with 20 wt% MgO was found suitable for film production. The physicochemical processes of the formation of materials were studied, including the main stages: removal of physically bound and chemically bound water, combustion of alcohol and the products of thermo-oxidative destruction of ethoxy groups, and crystallization processes. The phase composition and structure of the films obtained were established at 600 °C and above when crystalline forms of SiO2, CaSiO3, Ca2P2O7, and complex phosphates were fixed. In the system with the addition of magnesium ions, β-cristobalite SiO2 and stenfieldt Mg3Ca3(PO4)4 were detected; however, a crystalline sample could only be obtained at 800 °C. In the system with sodium ions, chemical compounds Ca5(PO4)3Cl, NaCl, and SiO2 were determined. A uniform film coating was formed on the surface of the substrate. The introduction of sodium oxide into the SiO2–P2O5–CaO system increased the bioactivity of the materials obtained. |
| Databáze: | OpenAIRE |
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