Effects of Mg and Hydrogel Solid Content on the Crystallization of Calcium Carbonate in Biomimetic Counter-diffusion Systems
| Autor: | Wolfgang W. Schmahl, Andreas Ziegler, Fitriana Nindiyasari, José Manuel Astilleros, Erika Griesshaber, Lurdes Fernández-Díaz, Nuria Sánchez-Pastor |
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| Rok vydání: | 2014 |
| Předmět: |
Calcite
food.ingredient Nanocomposite Mineralogy General Chemistry Condensed Matter Physics Gelatin law.invention chemistry.chemical_compound food Calcium carbonate chemistry Chemical engineering law Self-healing hydrogels Carbonate General Materials Science Crystallization Electron backscatter diffraction |
| Zdroj: | Crystal Growth & Design. 14:4790-4802 |
| ISSN: | 1528-7505 1528-7483 |
| Popis: | Carbonate biominerals are nanocomposites with an intimate association of organic and mineral components. Here we investigate the crystallization of CaCO3 in gelatin hydrogels (2.5 and 10 wt % solid content) in the presence of Mg (0.01 M) in the growth medium. The precipitate consisted mainly of calcite in all experiments. A wide variety of morphologies and incorporated Mg contents (up to 26 mol % in sphere-like aggregates grown in 10 wt % gelatin) was observed. Etching experiments uncovered an intimate relationship between the inorganic component and a polymeric network in the calcite crystal aggregates. The characteristics of this network varied for hydrogels with different solid contents. When Mg was not present in the growth medium, we obtained 200 nm to 1 μm thick incorporations that were bordered on both sides by a delicate gelatin network. As Mg was added, the incorporations became thinner (∼50–60 nm), and the gelatin network became compact. Electron backscatter diffraction evidenced that the calcit... |
| Databáze: | OpenAIRE |
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