Monodisperse calcium carbonate microtablets forming at 70°C in prerefrigerated CaCl2-Gelatin-Urea solutions
| Autor: | Tas, A.C. |
|---|---|
| Přispěvatelé: | Tas, A.C., Yeditepe Üniversitesi |
| Jazyk: | angličtina |
| Rok vydání: | 2009 |
| Popis: | Calcium carbonate particles with a unique tablet shape were produced by simply aging the prerefrigerated (at 4°C for 24h) CaCl2 -gelatin-urea solutions at 70°C for 24h in ordinary glass media bottles. Gelatin is known to be the denatured collagen. The thermal decomposition of dissolved urea was exploited to provide the Ca2+ ion and gelatin-containing solutions with aqueous carbonate ions. Monodisperse CaCO3 microtablets formed in solution had a mean particle size of 4 ± 2.5µm. CaCO3 microtablets were biphasic in nature and comprised of about 93% vaterite and 7% calcite. Identical solutions used without prerefrigeration yielded only trigonal prismatic calcite crystals upon aging at 70°C for 24h. Prerefrigeration of CaCl2 -gelatin-urea solutions was thus shown to have a remarkable effect on the particle morphology. Samples were characterized by scanning electron microscopy, Fourier-transform infrared spectroscopy, and powder X-ray diffraction. © 2009 American Ceramic Society. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|