- Eklemek veya çıkarmak istediğiniz kriterleriniz için 'Dahil' / 'Hariç' seçeneğini kullanabilirsiniz. Sorgu satırları birbirine 'VE' bağlacı ile bağlıdır. - İptal tuşuna basarak normal aramaya dönebilirsiniz.
Calcium carbonate microparticles with a unique biconvex pill shape were produced by simply ageing the prerefrigerated (4°C, 24 h) CaCl 2-gelatin-urea solutions at 70°C for 24 h in glass media bottles. Gelatin is known to be the denatured collagen. Thermal decomposition of dissolved urea was exploited to provide the Ca2+ ion and gelatin-containing solutions with aqueous carbonate ions. Monodisperse CaCO 3 micropills formed in solution had the mean particle size of 4±2.5 µm. CaCO3 micropills were typically biphasic in nature and consisted of 93% vaterite and 7% calcite. Identical solutions used without prerefrigeration yielded only tr . . .igonal prismatic calcite crystals upon ageing at 70°C for 24 h. Prerefrigeration of CaCl2-gelatin-urea solutions was thus shown to have an unusual effect on the particle morphology. Samples were characterized by scanning electron microscopy (SEM), Fourier-transform infrared spectroscopy (FTIR) and powder X-ray diffraction (XRD)