Monodisperse Calcium Carbonate Microtablets Forming at 70°C in Prerefrigerated CaCl2–Gelatin–Urea Solutions
Monodisperse Calcium Carbonate Microtablets Forming at 70°C in Prerefrigerated CaCl2–Gelatin–Urea Solutions
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DOI：
10.1111/j.1744-7402.2008.02252.x
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发表时间：
2009
影响因子：
2.1
通讯作者：
A. Tas
中科院分区：
文献类型：
--
作者：
A. Tas
将预冷（4°C下24 h）的CaCl 2 -明胶-尿素溶液在普通玻璃介质瓶中于70°C下简单老化24 h，制得具有独特片剂形状的碳酸钙颗粒。明胶是已知的变性胶原蛋白。利用溶解的尿素的热分解来提供Ca 2+离子和含有明胶的溶液与水性碳酸根离子。在溶液中形成的单分散CaCO 3微片的平均粒径为4 ± 2.5 μm。CaCO 3微片在性质上是双相的，并且由约93%的球霰石和7%的方解石组成。在70°C下老化24小时后，未预冷冻的相同溶液仅产生三角棱柱形方解石晶体。CaCl 2 -明胶-尿素溶液的预冷对颗粒形貌有显著影响。通过扫描电子显微镜、傅里叶变换红外光谱和粉末X射线衍射对样品进行了表征。
Calcium carbonate particles with a unique tablet shape were produced by simply aging the prerefrigerated (at 4°C for 24 h) CaCl 2 -gelatin-urea solutions at 70°C for 24 h in ordinary glass media bottles. Gelatin is known to be the denatured collagen. The thermal decomposition of dissolved urea was exploited to provide the Ca 2+ ion and gelatin-containing solutions with aqueous carbonate ions. Monodisperse CaCO 3 microtablets formed in solution had a mean particle size of 4 ± 2.5 μm. CaCO 3 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 24 h. Prerefrigeration of CaCl 2 -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.