Water-soluble terpolymer-mediated calcium carbonate crystal modification.
Water-soluble terpolymer-mediated calcium carbonate crystal modification.
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DOI：
10.1021/la0362526
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发表时间：
2004-03
期刊：
影响因子：
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通讯作者：
R. K. Pai;S. Hild;A. Ziegler;O. Marti
中科院分区：
文献类型：
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作者：
R. K. Pai;S. Hild;A. Ziegler;O. Marti
聚合物底物的结构对碳酸钙晶体的成核起着重要的作用。本研究发现，在特定的实验条件下，合成的水溶性聚（丙烯酰胺-co-2-丙烯酰胺-2-甲基-1-丙烷磺酸钠-co-n-乙烯基吡咯烷酮）是一种有利于碳酸钙晶体多晶成核的底物。利用原子力显微镜、扫描电镜、能量色散光谱、FTIR分析和x射线衍射对多晶体进行了形态表征。如果碳酸钙在三元共聚物的存在下沉淀，可以观察到成核密度（每单位面积的晶体数量）的显著增加。形成菱面体形态的堆积晶体可能是由于在三元共聚物上存在磺酸钠基团。然而，在聚l -天冬氨酸的存在下，几乎所有的晶体都是中空的，形成针状或片状的形态。如果存在聚l -天冬氨酸，这种碳酸钙形态的变化可以用聚合物构象的变化来解释。
The structure of the polymeric substrate plays an important role in the nucleation of calcium carbonate crystals. In this study a synthetic water-soluble poly(acrylamide-co-2-acrylamido-2-methyl-1-propane sodium sufonate-co-n-vinyl pyrrolidone) was found to be a substrate favoring the nucleation of polymorphs of calcium carbonate crystals under specific experimental conditions. Morphological characterization of the polymorphs was done using atomic force microscopy, scanning electron microscopy, energy dispersive spectroscopy, FTIR analysis, and X-ray diffraction. If calcium carbonate is precipitated in the presence of terpolymer, a remarkable increase in nucleation density (number of crystals per unit area) was observed. Stacked crystals of rhombohedral morphology that formed may be due to the presence of sodium sulfonate groups on the terpolymer. However, in the presence of poly-L-aspartic acid, almost all crystals are hollow and have needlelike or plate like morphology was formed. This change in calcium carbonate morphology can be explained by the variation of the polymer conformation, if poly- L-aspartic acid is present.