Influence of polyvinylpyrrolidone on the precipitation of calcium carbonate and on the transformation of vaterite to calcite
Influence of polyvinylpyrrolidone on the precipitation of calcium carbonate and on the transformation of vaterite to calcite
复制标题
聚乙烯吡咯烷酮对碳酸钙沉淀和球霰石向方解石转化的影响
DOI：
10.1016/s0022-0248(02)02484-3
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发表时间：
2003-04-01
影响因子：
1.8
通讯作者：
Xu, DF
中科院分区：
文献类型：
--
作者：
Wei, H;Shen, Q;Xu, DF
用扫描电子显微镜、粉末X射线衍射仪和傅立叶变换红外光谱等方法研究了碳酸钙在聚N-乙烯-2-吡咯烷酮(PVP)存在和不存在条件下的常温沉淀过程。结果表明，PVP不影响CaCO3晶体的晶型，但影响CaCO3晶体的形态和尺寸。加入PVP后，无定形CaCO3在向晶态转变之前可以聚集成较大的无定形球晶。此外，还研究了在PVP存在下热力学不稳定的球石向稳定方解石的转变。作为粒子稳定剂，PVP分子抑制球状沸石的形成，但促进方解石的形成以及溶剂介导的速度。球泡石向方解石的转化。(C)2003 Elsevier Science B.V.保留所有权利。
The Precipitation process of calcium carbonate (CaCO3) in the absence and presence of poly (N-vinyl-2-pyrrolidone) (PVP) was investigated using scanning electron microscopy, powder X-ray diffraction, and Fourier transform infrared spectroscopy methods at room temperature. The results indicate that PVP does not affect the polymorphy, but has influence on their morphology and size of CaCO3 crystals. With the addition of PVP, the amorphous CaCO3 could aggregate into bigger amorphous spherulites before transforming to crystalline state. Also, the transformation from the thermodynamically unstable vaterite to the stable calcite was investigated in the presence of PVP. As a particle-stabilizing agent, PVP molecules inhibit the formation of vaterite, however, promote the formation of calcite as well as the rate of the solvent-mediated. transformation from vaterite to calcite. (C) 2003 Elsevier Science B.V. All rights reserved.