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选择了具有代表性的化学官能团,羟基(—OH)、氨基(—NH2)、羧基(—COOH)和甲基(—CH3),通过在单晶硅片上进行接枝改性,并在改性后的硅基底上进行碳酸钙体外矿化模拟实验,以研究这些官能团对碳酸钙矿化的影响。利用接触角实验对接枝效果进行了分析,结果显示接枝成功。根据拉曼光谱(Raman)确定了碳酸钙的晶型;采用扫描电子显微镜(SEM)获得了碳酸钙的形貌、尺寸、数量和取向信息。结果显示羟基化硅基底上出现了方解石的聚集;氨基化硅基底和羧基化硅基底上均出现一定量的球文石,但形貌各异;甲基化硅基底上晶体数目较少。通过对结果的对比分析,认为羟基和甲基对碳酸钙的晶型选择无明显影响,氨基和羧基能通过对碳酸根离子或钙离子的吸附而诱导球文石结晶。
A series of chemical functional groups, hydroxyl group (-OH), amino group (-NH2), carboxyl group (-COOH) and methyl group (-CH3) were selected and grafted on single- Calcium carbonate mineralization simulation experiments on silicon substrates were performed to investigate the effect of these functional groups on the mineralization of calcium carbonate. The contact angle experiment was used to analyze the grafting effect and the results showed that the grafting was successful. The crystal form of calcium carbonate was determined by Raman spectroscopy. The morphology, size, amount and orientation of calcium carbonate were obtained by scanning electron microscopy (SEM). The results showed that there was calcite agglomeration on the hydroxylated silicon substrate. A certain amount of aragonite appeared on both the aminated and carboxylated silicon substrates, but the morphologies were different. The number of crystals on the methylated silicon substrate was small. Through the comparative analysis of the results, it is considered that the hydroxyl and methyl groups have no obvious effect on the crystal type selection of calcium carbonate, and the amino and carboxyl groups can induce the abalite crystallization through the adsorption of carbonate ions or calcium ions.