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不同化学官能团对无机相碳酸钙晶体的调控

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Keywords: 生物矿化,碳酸钙,化学官能团,体外模拟矿化

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Abstract:

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。

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